Acton Water Supply District (MA) Water Quality

Acton Water Supply District is a large public water system in EPA region 1 that provides tap water for the 01718 - 01720 zip codes. It has 13 facilities where the water supply was tested for 78 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 12.3 µg/L. The maximum reported level of Manganese was 1090 µg/L. Some (1 of 14 or 7%) of the latest water samples showed levels of Manganese that were at or above unsafe concentration levels. There were 2 contamintants found in the Acton Water Supply District water supply at levels that were above the minimum reporting level. 1 of the contaminants were above the reference level, which means they may pose a risk to human health.

Table of Contents
Contaminants
Facilities
FAQ

Contaminants

Jump To Contaminant
1,1-dichloroethane (16)
1,2,3-trichloropropane (16)
1,3-butadiene (16)
1,4-dioxane (16)
1-butanol (14)
11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (10)
1H,1H,2H,2H-perfluorodecane sulfonic acid (10)
1H,1H,2H,2H-perfluorohexane sulfonic acid (10)
1H,1H,2H,2H-perfluorooctane sulfonic acid (10)
2,4-dinitrotoluene (14)
2,6-dinitrotoluene (14)
2-methoxyethanol (14)
2-propen-1-ol (Allyl Alcohol) (14)
4,4'-dichloro dichlorophenyl ethylene (DDE) (14)
4,8-dioxa-3H-perfluorononanoic acid (10)
9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (10)
alpha-hexachlorocyclohexane (13)
anatoxin-a (8)
bromochloromethane (Halon 1011) (16)
bromomethane (16)
Butylated Hydroxyanisole (14)
chlorate (32)
chlorodifluoromethane (HCFC-22) (16)
chloromethane (16)
chlorpyrifos (13)
chromium (32)
chromium-6 (32)
cobalt (32)
cylindrospermopsin (8)
dimethipin (13)
dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (14)
ethoprop (13)
Germanium (14)
HAA5 (five regulated haloacetic acids) (12)
HAA6Br (six brominated haloacetic acids) (12)
HAA9 (nine haloacetic acids) (12)
hexafluoropropylene oxide dimer acid (GenX) (10)
lithium (10)
Manganese (14)
methyl-tertiary-butyl-ether (MTBE) (14)
molinate (14)
molybdenum (32)
N-ethyl perfluorooctanesulfonamidoacetic acid (10)
N-methyl perfluorooctanesulfonamidoacetic acid (10)
nitrobenzene (14)
nonafluoro-3,6-dioxaheptanoic acid (10)
o-toluidine (14)
oxyfluorfen (13)
perchlorate (14)
perfluoro(2-ethoxyethane)sulfonic acid (10)
perfluoro-3-methoxypropanoic acid (10)
perfluoro-4-methoxybutanoic acid (10)
perfluorobutanesulfonic acid (26)
perfluorobutanoic acid (10)
perfluorodecanoic acid (10)
perfluorododecanoic acid (10)
perfluoroheptanesulfonic acid (10)
perfluoroheptanoic acid (26)
perfluorohexanesulfonic acid (26)
perfluorohexanoic acid (10)
perfluorononanoic acid (26)
perfluorooctanesulfonic acid (26)
perfluorooctanoic acid (26)
perfluoropentanesulfonic acid (10)
perfluoropentanoic acid (10)
perfluorotetradecanoic acid (10)
perfluorotridecanoic acid (10)
perfluoroundecanoic acid (10)
profenofos (13)
quinoline (14)
s-ethyl-dipropylthiocarbamate (EPTC) (14)
strontium (32)
tebuconazole (13)
terbacil (14)
total microcystins (8)
Total Permethrin (13)
tribufos (13)
vanadium (32)

1,1-dichloroethane (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: ?

Contaminant Details

1,2,3-trichloropropane (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: ?

Contaminant Details

1,3-butadiene (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.1 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.1 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.1 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.1 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.1 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.1 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.1 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.1 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.1 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.1 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.1 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.1 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.1 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.1 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.1 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.1 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.1 µg/L
Reference Level: ?

Contaminant Details

1,4-dioxane (16)

EPTDS from School Street WTF

School Street WTF ℹ️

0.24 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.17 µg/L

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

0.41 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.34 µg/L

12/9/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.33 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.26 µg/L

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.07 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.07 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.07 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.28 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.21 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

0.099 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.029 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.07 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.29 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.22 µg/L

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

0.26 µg/L

⚠️ Exceeds Reporting Level of 0.07 µg/L by 0.19 µg/L

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.07 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.07 µg/L
Reference Level: ?

Contaminant Details

1-butanol (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<2 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<2 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<2 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<2 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 2 µg/L
Reference Level: 700 µg/L

Contaminant Details

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.005 µg/L
Reference Level: ?

Contaminant Details

1H,1H,2H,2H-perfluorodecane sulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.005 µg/L
Reference Level: ?

Contaminant Details

1H,1H,2H,2H-perfluorohexane sulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

1H,1H,2H,2H-perfluorooctane sulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.005 µg/L
Reference Level: ?

Contaminant Details

2,4-dinitrotoluene (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 2 µg/L
Reference Level: ?

Contaminant Details

2,6-dinitrotoluene (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 2 µg/L
Reference Level: ?

Contaminant Details

2-methoxyethanol (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.4 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.4 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.4 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.4 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.4 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.4 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.4 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.4 µg/L
Reference Level: 21 µg/L

Contaminant Details

2-propen-1-ol (Allyl Alcohol) (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.5 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.5 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.5 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.5 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.5 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.5 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.5 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.5 µg/L
Reference Level: 35 µg/L

Contaminant Details

4,4'-dichloro dichlorophenyl ethylene (DDE) (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.8 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.8 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 0.8 µg/L
Reference Level: ?

Contaminant Details

4,8-dioxa-3H-perfluorononanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.002 µg/L
Reference Level: ?

Contaminant Details

alpha-hexachlorocyclohexane (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.01 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.01 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.01 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.01 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.01 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.01 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.01 µg/L
Reference Level: 0.006 µg/L

Contaminant Details

anatoxin-a (8)

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

8/18/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

8/4/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/21/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/7/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/15/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/2/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/18/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/6/2020

5 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: ?

Contaminant Details

bromochloromethane (Halon 1011) (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.06 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.06 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.06 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.06 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.06 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.06 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.06 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.06 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.06 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.06 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.06 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.06 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.06 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.06 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.06 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.06 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.06 µg/L
Reference Level: ?

Contaminant Details

bromomethane (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.2 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.2 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.2 µg/L
Reference Level: ?

Contaminant Details

Butylated Hydroxyanisole (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/18/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/30/2019

6 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: ?

Contaminant Details

chlorate (32)

Entry Point to Dist. System

North Acton WTP ℹ️

84 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 64 µg/L

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

76 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 56 µg/L

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

57 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 37 µg/L

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

48 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 28 µg/L

2/11/2014

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

98 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 78 µg/L

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

80 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 60 µg/L

12/9/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

75 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 55 µg/L

12/9/2013

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

95 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 75 µg/L

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

99 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 79 µg/L

11/20/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

120 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 100 µg/L

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

100 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 80 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

97 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 77 µg/L

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

85 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 65 µg/L

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

82 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 62 µg/L

11/19/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

82 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 62 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<20 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

170 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 150 µg/L

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

160 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 140 µg/L

8/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

110 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 90 µg/L

8/13/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

76 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 56 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

150 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 130 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

110 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 90 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

50 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 30 µg/L

5/14/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

130 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 110 µg/L

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

94 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 74 µg/L

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

70 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 50 µg/L

5/13/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

66 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 46 µg/L

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

65 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 45 µg/L

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

63 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 43 µg/L

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

57 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 37 µg/L

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

56 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 36 µg/L

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

52 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 32 µg/L

5/13/2013

12 years ago

Minimum Reporting Level: 20 µg/L
Reference Level: ?

Contaminant Details

chlorodifluoromethane (HCFC-22) (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.08 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.08 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.08 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.08 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.08 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.08 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.08 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.08 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.08 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.08 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.08 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.08 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.08 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.08 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.08 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.08 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.08 µg/L
Reference Level: ?

Contaminant Details

chloromethane (16)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.2 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.2 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.2 µg/L
Reference Level: ?

Contaminant Details

chlorpyrifos (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: 2 µg/L

Contaminant Details

chromium (32)

EPTDS from School Street WTF

School Street WTF ℹ️

0.6 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.4 µg/L

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.78 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.58 µg/L

11/18/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.2 µg/L

Below Reporting Level

11/18/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.79 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.59 µg/L

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.24 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.04 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.22 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.02 µg/L

8/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.21 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.01 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.29 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.09 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

0.28 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.08 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

0.26 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.06 µg/L

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

1 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.8 µg/L

5/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.32 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.12 µg/L

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

0.3 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.1 µg/L

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

0.28 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.08 µg/L

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

0.28 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.08 µg/L

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.28 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.08 µg/L

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

0.26 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.06 µg/L

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

0.26 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.06 µg/L

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

0.23 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.03 µg/L

5/13/2013

12 years ago

Minimum Reporting Level: 0.2 µg/L
Reference Level: ?

Contaminant Details

chromium-6 (32)

EPTDS from School Street WTF

School Street WTF ℹ️

0.6 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.57 µg/L

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.12 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.09 µg/L

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.12 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.09 µg/L

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.091 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.061 µg/L

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.74 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.71 µg/L

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

0.043 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.013 µg/L

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<0.03 µg/L

Below Reporting Level

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.12 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.09 µg/L

11/20/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.15 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.12 µg/L

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

0.14 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.11 µg/L

11/19/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

0.058 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.028 µg/L

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

0.054 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.024 µg/L

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.048 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.018 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

0.037 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.007 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.73 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.7 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.15 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.12 µg/L

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.15 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.12 µg/L

8/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.1 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.07 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.13 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.1 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.77 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.74 µg/L

5/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.13 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.1 µg/L

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

0.092 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.062 µg/L

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

0.089 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.059 µg/L

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.06 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.03 µg/L

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

0.054 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.024 µg/L

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

0.046 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.016 µg/L

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: ?

Contaminant Details

cobalt (32)

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

1.4 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.4 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

11/18/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

1.6 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.6 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

1.4 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.4 µg/L

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

1.4 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.4 µg/L

5/13/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 1 µg/L
Reference Level: ?

Contaminant Details

cylindrospermopsin (8)

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

8/18/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

8/4/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

7/21/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

7/7/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

6/15/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

6/2/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

5/18/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

5/6/2020

5 years ago

Minimum Reporting Level: 0.09 µg/L
Reference Level: 0.7 µg/L

Contaminant Details

dimethipin (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.2 µg/L
Reference Level: 140 µg/L

Contaminant Details

dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (14)

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

3/11/2002

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<1 µg/L

Below Reporting Level

12/20/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 1 µg/L
Reference Level: ?

Contaminant Details

ethoprop (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.03 µg/L
Reference Level: 1.14 µg/L

Contaminant Details

Germanium (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.3 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.3 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.3 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.3 µg/L

Below Reporting Level

1/31/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.3 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.3 µg/L
Reference Level: ?

Contaminant Details

HAA5 (five regulated haloacetic acids) (12)

210 Main Street

Distribution System ℹ️

10.2 µg/L

Meets Reporting Threshold

10/17/2019

5 years ago

11 Breezy Point

Distribution System ℹ️

8.4 µg/L

Meets Reporting Threshold

10/17/2019

5 years ago

486 Main Street

Distribution System ℹ️

5.8 µg/L

Meets Reporting Threshold

10/17/2019

5 years ago

5 Highland

Distribution System ℹ️

4 µg/L

Meets Reporting Threshold

10/17/2019

5 years ago

5 Highland

Distribution System ℹ️

5.7 µg/L

Meets Reporting Threshold

7/24/2019

6 years ago

210 Main Street

Distribution System ℹ️

12.3 µg/L

Meets Reporting Threshold

7/23/2019

6 years ago

11 Breezy Point

Distribution System ℹ️

12.1 µg/L

Meets Reporting Threshold

7/23/2019

6 years ago

486 Main Street

Distribution System ℹ️

8.5 µg/L

Meets Reporting Threshold

7/23/2019

6 years ago

210 Main Street

Distribution System ℹ️

9.1 µg/L

Meets Reporting Threshold

4/10/2019

6 years ago

486 Main Street

Distribution System ℹ️

3.03 µg/L

Meets Reporting Threshold

4/10/2019

6 years ago

11 Breezy Point

Distribution System ℹ️

1.41 µg/L

Meets Reporting Threshold

4/10/2019

6 years ago

5 Highland

Distribution System ℹ️

1.35 µg/L

Meets Reporting Threshold

4/10/2019

6 years ago

Minimum Reporting Level: 0.5 µg/L
Reference Level: 60 µg/L

Contaminant Details

HAA6Br (six brominated haloacetic acids) (12)

210 Main Street

Distribution System ℹ️

9.3 µg/L

10/17/2019

5 years ago

486 Main Street

Distribution System ℹ️

4.7 µg/L

10/17/2019

5 years ago

11 Breezy Point

Distribution System ℹ️

4.4 µg/L

10/17/2019

5 years ago

5 Highland

Distribution System ℹ️

3.8 µg/L

10/17/2019

5 years ago

5 Highland

Distribution System ℹ️

3.7 µg/L

7/24/2019

6 years ago

210 Main Street

Distribution System ℹ️

9.6 µg/L

7/23/2019

6 years ago

486 Main Street

Distribution System ℹ️

5.3 µg/L

7/23/2019

6 years ago

11 Breezy Point

Distribution System ℹ️

4.4 µg/L

7/23/2019

6 years ago

210 Main Street

Distribution System ℹ️

10.5 µg/L

4/10/2019

6 years ago

486 Main Street

Distribution System ℹ️

4.76 µg/L

4/10/2019

6 years ago

5 Highland

Distribution System ℹ️

2.8 µg/L

4/10/2019

6 years ago

11 Breezy Point

Distribution System ℹ️

1.85 µg/L

4/10/2019

6 years ago

Minimum Reporting Level: 0 µg/L
Reference Level: ?

Contaminant Details

HAA9 (nine haloacetic acids) (12)

210 Main Street

Distribution System ℹ️

17.9 µg/L

10/17/2019

5 years ago

11 Breezy Point

Distribution System ℹ️

12.8 µg/L

10/17/2019

5 years ago

486 Main Street

Distribution System ℹ️

10 µg/L

10/17/2019

5 years ago

5 Highland

Distribution System ℹ️

7.3 µg/L

10/17/2019

5 years ago

5 Highland

Distribution System ℹ️

9.1 µg/L

7/24/2019

6 years ago

210 Main Street

Distribution System ℹ️

21 µg/L

7/23/2019

6 years ago

11 Breezy Point

Distribution System ℹ️

16.5 µg/L

7/23/2019

6 years ago

486 Main Street

Distribution System ℹ️

13.8 µg/L

7/23/2019

6 years ago

210 Main Street

Distribution System ℹ️

17.9 µg/L

4/10/2019

6 years ago

486 Main Street

Distribution System ℹ️

6.83 µg/L

4/10/2019

6 years ago

5 Highland

Distribution System ℹ️

3.3 µg/L

4/10/2019

6 years ago

11 Breezy Point

Distribution System ℹ️

2.95 µg/L

4/10/2019

6 years ago

Minimum Reporting Level: 0 µg/L
Reference Level: ?

Contaminant Details

hexafluoropropylene oxide dimer acid (GenX) (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.005 µg/L
Reference Level: ?

Contaminant Details

lithium (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<9 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<9 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<9 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<9 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<9 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<9 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<9 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<9 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<9 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<9 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 9 µg/L
Reference Level: ?

Contaminant Details

Manganese (14)

Entry Point to Dist. System

North Acton WTP ℹ️

0.81 µg/L

Meets Reporting Threshold

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

7.1 µg/L

Meets Reporting Threshold

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

121 µg/L

Meets Reporting Threshold

7/31/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

148 µg/L

Meets Reporting Threshold

7/25/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

13 µg/L

Meets Reporting Threshold

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

3.8 µg/L

Meets Reporting Threshold

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

3.1 µg/L

Meets Reporting Threshold

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

6.7 µg/L

Meets Reporting Threshold

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

1.2 µg/L

Meets Reporting Threshold

4/16/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

1090 µg/L

☠️ Exceeds Reference Level by 790 µg/L

1/31/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

30.8 µg/L

Meets Reporting Threshold

1/31/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

193 µg/L

⚠️ Exceeds 50% of Reference Level

1/30/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

1.9 µg/L

Meets Reporting Threshold

1/30/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

8.3 µg/L

Meets Reporting Threshold

1/29/2019

6 years ago

Minimum Reporting Level: 0.4 µg/L
Reference Level: 300 µg/L

Contaminant Details

methyl-tertiary-butyl-ether (MTBE) (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<5 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<5 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 5 µg/L
Reference Level: ?

Contaminant Details

molinate (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.9 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.9 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 0.9 µg/L
Reference Level: ?

Contaminant Details

molybdenum (32)

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

11/18/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<1 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<1 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 1 µg/L
Reference Level: ?

Contaminant Details

N-ethyl perfluorooctanesulfonamidoacetic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/22/2024

18 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.005 µg/L
Reference Level: ?

Contaminant Details

N-methyl perfluorooctanesulfonamidoacetic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

3/22/2024

18 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.006 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.006 µg/L
Reference Level: ?

Contaminant Details

nitrobenzene (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<10 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<10 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 10 µg/L
Reference Level: ?

Contaminant Details

nonafluoro-3,6-dioxaheptanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.02 µg/L
Reference Level: ?

Contaminant Details

o-toluidine (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

11/18/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.007 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.007 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.007 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.007 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.007 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.007 µg/L

Below Reporting Level

1/30/2019

6 years ago

Minimum Reporting Level: 0.007 µg/L
Reference Level: ?

Contaminant Details

oxyfluorfen (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.05 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.05 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.05 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.05 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.05 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.05 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.05 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.05 µg/L
Reference Level: 200 µg/L

Contaminant Details

perchlorate (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<4 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<4 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 4 µg/L
Reference Level: ?

Contaminant Details

perfluoro(2-ethoxyethane)sulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluoro-3-methoxypropanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.004 µg/L
Reference Level: ?

Contaminant Details

perfluoro-4-methoxybutanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorobutanesulfonic acid (26)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0036 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0006 µg/L

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0034 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0004 µg/L

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0037 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0007 µg/L

6/5/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0032 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0002 µg/L

3/15/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

0.0035 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0005 µg/L

3/13/2023

2 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.09 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.09 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.09 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.09 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.09 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.09 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.09 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.09 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.09 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.09 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.09 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.09 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.09 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorobutanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

0.0183 µg/L

⚠️ Exceeds Reporting Level of 0.005 µg/L by 0.0133 µg/L

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0206 µg/L

⚠️ Exceeds Reporting Level of 0.005 µg/L by 0.0156 µg/L

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0141 µg/L

⚠️ Exceeds Reporting Level of 0.005 µg/L by 0.0091 µg/L

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0118 µg/L

⚠️ Exceeds Reporting Level of 0.005 µg/L by 0.0068 µg/L

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.005 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.005 µg/L
Reference Level: ?

Contaminant Details

perfluorodecanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorododecanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluoroheptanesulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluoroheptanoic acid (26)

Entry Point to Dist. System

North Acton WTP ℹ️

0.0038 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0008 µg/L

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0048 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0018 µg/L

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0052 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0022 µg/L

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0046 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0016 µg/L

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.01 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.01 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.01 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.01 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.01 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.01 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.01 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.01 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.01 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.01 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.01 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.01 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.01 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorohexanesulfonic acid (26)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0032 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0002 µg/L

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.03 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorohexanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

0.0047 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0017 µg/L

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0066 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0036 µg/L

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0054 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0024 µg/L

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0063 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0033 µg/L

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0058 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0028 µg/L

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0071 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0041 µg/L

6/5/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0055 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0025 µg/L

3/15/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0052 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0022 µg/L

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

0.003 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0 µg/L

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorononanoic acid (26)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/13/2023

2 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.02 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.02 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.02 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.02 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.02 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.02 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.02 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.02 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.004 µg/L
Reference Level: ?

Contaminant Details

perfluorooctanesulfonic acid (26)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0047 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0007 µg/L

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

0.0042 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0002 µg/L

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0047 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0007 µg/L

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0046 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0006 µg/L

6/5/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0042 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0002 µg/L

3/15/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

0.0049 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0009 µg/L

3/13/2023

2 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.04 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.04 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.04 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.04 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.04 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.04 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.04 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.04 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.04 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.04 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.04 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.04 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.004 µg/L
Reference Level: ?

Contaminant Details

perfluorooctanoic acid (26)

Entry Point to Dist. System

North Acton WTP ℹ️

0.0096 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0056 µg/L

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0072 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0032 µg/L

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

0.0047 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0007 µg/L

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0119 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0079 µg/L

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0073 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0033 µg/L

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0134 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0094 µg/L

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0071 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0031 µg/L

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0113 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0073 µg/L

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0061 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0021 µg/L

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

0.0051 µg/L

⚠️ Exceeds Reporting Level of 0.004 µg/L by 0.0011 µg/L

3/13/2023

2 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

12/9/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.02 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.02 µg/L

Below Reporting Level

12/9/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.02 µg/L

Below Reporting Level

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.02 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.02 µg/L

Below Reporting Level

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.02 µg/L

Below Reporting Level

5/14/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.02 µg/L

Below Reporting Level

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.02 µg/L

Below Reporting Level

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.02 µg/L

Below Reporting Level

5/13/2013

12 years ago

Minimum Reporting Level: 0.004 µg/L
Reference Level: ?

Contaminant Details

perfluoropentanesulfonic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.004 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.004 µg/L
Reference Level: ?

Contaminant Details

perfluoropentanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

0.0049 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0019 µg/L

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0084 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0054 µg/L

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0046 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0016 µg/L

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0081 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0051 µg/L

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0049 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0019 µg/L

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0081 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0051 µg/L

6/5/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

0.0064 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0034 µg/L

3/15/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.0044 µg/L

⚠️ Exceeds Reporting Level of 0.003 µg/L by 0.0014 µg/L

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.003 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.003 µg/L
Reference Level: ?

Contaminant Details

perfluorotetradecanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

3/22/2024

18 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.008 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.008 µg/L
Reference Level: ?

Contaminant Details

perfluorotridecanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

3/22/2024

18 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.007 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.007 µg/L
Reference Level: ?

Contaminant Details

perfluoroundecanoic acid (10)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

1/5/2024

20 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

12/6/2023

21 months ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

9/25/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

9/21/2023

24 months ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

9/18/2023

24 months ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

6/28/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

6/5/2023

2 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

3/15/2023

2 years ago

Entry Point to the Dist. System

Central Acton WTP ℹ️

<0.002 µg/L

Below Reporting Level

3/13/2023

2 years ago

Minimum Reporting Level: 0.002 µg/L
Reference Level: ?

Contaminant Details

profenofos (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.3 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.3 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.3 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.3 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.3 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.3 µg/L
Reference Level: 0.3 µg/L

Contaminant Details

quinoline (14)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

11/18/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.02 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.02 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.02 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

4/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.02 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.02 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.02 µg/L

Below Reporting Level

1/30/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.02 µg/L

Below Reporting Level

1/30/2019

6 years ago

Minimum Reporting Level: 0.02 µg/L
Reference Level: 0.01 µg/L

Contaminant Details

s-ethyl-dipropylthiocarbamate (EPTC) (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<1 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 1 µg/L
Reference Level: ?

Contaminant Details

strontium (32)

Entry Point to Dist. System

North Acton WTP ℹ️

250 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 249.7 µg/L

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

240 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 239.7 µg/L

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

180 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 179.7 µg/L

2/11/2014

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

150 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 149.7 µg/L

2/11/2014

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

180 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 179.7 µg/L

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

270 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 269.7 µg/L

11/20/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

250 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 249.7 µg/L

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

180 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 179.7 µg/L

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

170 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 169.7 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

160 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 159.7 µg/L

11/19/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

160 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 159.7 µg/L

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

150 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 149.7 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

87 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 86.7 µg/L

11/19/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

180 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 179.7 µg/L

11/18/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

180 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 179.7 µg/L

11/18/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

160 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 159.7 µg/L

11/18/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

250 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 249.7 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

220 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 219.7 µg/L

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

220 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 219.7 µg/L

8/13/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

160 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 159.7 µg/L

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

240 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 239.7 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

150 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 149.7 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

130 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 129.7 µg/L

5/14/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

250 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 249.7 µg/L

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

210 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 209.7 µg/L

5/13/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

190 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 189.7 µg/L

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

190 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 189.7 µg/L

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

190 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 189.7 µg/L

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

180 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 179.7 µg/L

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

160 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 159.7 µg/L

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

150 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 149.7 µg/L

5/13/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

140 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 139.7 µg/L

5/13/2013

12 years ago

Minimum Reporting Level: 0.3 µg/L
Reference Level: ?

Contaminant Details

tebuconazole (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.2 µg/L
Reference Level: 190 µg/L

Contaminant Details

terbacil (14)

EPTDS from School Street WTF

School Street WTF ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

12/11/2001

23 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

MARSHALL WELLFIELD 19200

MARSHALL WELLFIELD ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<2 µg/L

Below Reporting Level

7/17/2001

24 years ago

Minimum Reporting Level: 2 µg/L
Reference Level: ?

Contaminant Details

total microcystins (8)

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

8/18/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

8/4/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/21/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/7/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

6/15/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

6/2/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

5/18/2020

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.3 µg/L

Below Reporting Level

5/6/2020

5 years ago

Minimum Reporting Level: 0.3 µg/L
Reference Level: ?

Contaminant Details

Total Permethrin (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.04 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.04 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.04 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.04 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.04 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.04 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.04 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.04 µg/L
Reference Level: 3.344 µg/L

Contaminant Details

tribufos (13)

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

10/28/2019

5 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

10/22/2019

5 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.07 µg/L

Below Reporting Level

7/31/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.07 µg/L

Below Reporting Level

7/25/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.07 µg/L

Below Reporting Level

7/24/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

4/16/2019

6 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to the Distribution System

South Acton WTP ℹ️

<0.07 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.07 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.07 µg/L

Below Reporting Level

1/29/2019

6 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

<0.07 µg/L

Below Reporting Level

1/29/2019

6 years ago

Minimum Reporting Level: 0.07 µg/L
Reference Level: 0.6 µg/L

Contaminant Details

vanadium (32)

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<0.2 µg/L

Below Reporting Level

2/11/2014

11 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

12/3/2013

11 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

11/20/2013

11 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

0.29 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.09 µg/L

11/19/2013

11 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<0.2 µg/L

Below Reporting Level

11/19/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

<0.2 µg/L

Below Reporting Level

11/18/2013

11 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

<0.2 µg/L

Below Reporting Level

11/18/2013

11 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

<0.2 µg/L

Below Reporting Level

8/13/2013

12 years ago

Entry Point to Dist. System

Conant Well #1 ℹ️

0.94 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.74 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

North Acton WTP ℹ️

0.83 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.63 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Conant II Wellfield ℹ️

0.81 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.61 µg/L

5/14/2013

12 years ago

Entry Point to Dist. System

Whitcomb & Clapp WTP ℹ️

0.92 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.72 µg/L

5/13/2013

12 years ago

DSMRT for Whitcomb & Clapp WTP

Distribution System - GW ℹ️

0.92 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.72 µg/L

5/13/2013

12 years ago

DSMRT for Conant Well #1

Distribution System - GW ℹ️

0.73 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.53 µg/L

5/13/2013

12 years ago

DSMRT for School Street WTF

Distribution System Mixed ℹ️

0.68 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.48 µg/L

5/13/2013

12 years ago

EPTDS from Assabet WTF

Assabet WTF ℹ️

0.66 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.46 µg/L

5/13/2013

12 years ago

DSMRT for Assabet WTF

Distribution System - GW ℹ️

0.65 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.45 µg/L

5/13/2013

12 years ago

DSMRT for Conant II Wellfield

Distribution System - GW ℹ️

0.65 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.45 µg/L

5/13/2013

12 years ago

DSMRT for Kennedy WTF

Distribution System - GU ℹ️

0.53 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.33 µg/L

5/13/2013

12 years ago

EPTDS from School Street WTF

School Street WTF ℹ️

0.4 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.2 µg/L

5/13/2013

12 years ago

Minimum Reporting Level: 0.2 µg/L
Reference Level: ?

Contaminant Details

Sampling Facilities

North Acton WTP
Ground Water (Under Direct Influence of Surface Water) (GU)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

South Acton WTP
Ground Water (Under Direct Influence of Surface Water) (GU)

Entry Point to the Distribution SystemEntry Point to the Distribution System (EP)

Central Acton WTP
Ground Water (GW)

Entry Point to the Dist. SystemEntry Point to the Distribution System (EP)

Conant Well #1
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Conant II Wellfield
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Whitcomb & Clapp WTP
Ground Water (GW)

Entry Point to Dist. SystemEntry Point to the Distribution System (EP)

Distribution System
Ground Water (Under Direct Influence of Surface Water) (GU)

11 Breezy PointDistribution System (DS)

5 HighlandDistribution System (DS)

210 Main StreetDistribution System (DS)

486 Main StreetDistribution System (DS)

School Street WTF
Multiple Sources (MX)

EPTDS from School Street WTFEntry Point to the Distribution System (EP)

Assabet WTF
Ground Water (GW)

EPTDS from Assabet WTFEntry Point to the Distribution System (EP)

Distribution System - GW
Ground Water (GW)

DSMRT for Assabet WTFMaximum Residence Time (MR)

DSMRT for Conant Well #1Maximum Residence Time (MR)

DSMRT for Conant II WellfieldMaximum Residence Time (MR)

DSMRT for Whitcomb & Clapp WTPMaximum Residence Time (MR)

Distribution System Mixed
Multiple Sources (MX)

DSMRT for School Street WTFMaximum Residence Time (MR)

Distribution System - GU
Ground Water (Under Direct Influence of Surface Water) (GU)

DSMRT for Kennedy WTFMaximum Residence Time (MR)

MARSHALL WELLFIELD
Ground Water (GW)

MARSHALL WELLFIELD 19200Entry Point to the Distribution System (EP)

FAQ

Is Acton Water Supply District tap water safe to drink?

When was Acton Water Supply District last tested for water contamination?

The latest water samples were taken on March 22nd, 2024.