City of Antioch (CA) Water Quality

City of Antioch is a large public water system in EPA region 9 that provides tap water for the 94509 zip codes. It has 4 facilities where the water supply was tested for 85 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 11.9 µg/L. The maximum reported level of Manganese was 7.78 µg/L. There were 2 contamintants found in the City of Antioch water supply at levels that were above the minimum reporting level.

Table of Contents
Contaminants
Facilities
FAQ

Contaminants

Jump To Contaminant
1,1-dichloroethane (4)
1,2,3-trichloropropane (4)
1,3-butadiene (4)
1,4-dioxane (4)
1-butanol (4)
11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (4)
17-alpha-ethynylestradiol (4)
17-beta-estradiol (4)
1H,1H,2H,2H-perfluorodecane sulfonic acid (4)
1H,1H,2H,2H-perfluorohexane sulfonic acid (4)
1H,1H,2H,2H-perfluorooctane sulfonic acid (4)
2,4-dinitrotoluene (4)
2,6-dinitrotoluene (4)
2-methoxyethanol (4)
2-propen-1-ol (Allyl Alcohol) (4)
4,4'-dichloro dichlorophenyl ethylene (DDE) (4)
4,8-dioxa-3H-perfluorononanoic acid (4)
4-androstene-3,17-dione (4)
9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (4)
alpha-hexachlorocyclohexane (4)
anatoxin-a (8)
bromochloromethane (Halon 1011) (4)
bromomethane (4)
Butylated Hydroxyanisole (4)
chlorate (8)
chlorodifluoromethane (HCFC-22) (4)
chloromethane (4)
chlorpyrifos (4)
chromium (8)
chromium-6 (8)
cobalt (8)
cylindrospermopsin (8)
dimethipin (4)
dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (4)
equilin (4)
estriol (4)
estrone (4)
ethoprop (4)
Germanium (4)
HAA5 (five regulated haloacetic acids) (30)
HAA6Br (six brominated haloacetic acids) (30)
HAA9 (nine haloacetic acids) (30)
hexafluoropropylene oxide dimer acid (GenX) (4)
lithium (4)
Manganese (4)
methyl-tertiary-butyl-ether (MTBE) (2)
molinate (4)
molybdenum (8)
N-ethyl perfluorooctanesulfonamidoacetic acid (4)
N-methyl perfluorooctanesulfonamidoacetic acid (4)
nitrobenzene (2)
nonafluoro-3,6-dioxaheptanoic acid (4)
o-toluidine (4)
oxyfluorfen (4)
perchlorate (4)
perfluoro(2-ethoxyethane)sulfonic acid (4)
perfluoro-3-methoxypropanoic acid (4)
perfluoro-4-methoxybutanoic acid (4)
perfluorobutanesulfonic acid (8)
perfluorobutanoic acid (4)
perfluorodecanoic acid (4)
perfluorododecanoic acid (4)
perfluoroheptanesulfonic acid (4)
perfluoroheptanoic acid (8)
perfluorohexanesulfonic acid (8)
perfluorohexanoic acid (4)
perfluorononanoic acid (8)
perfluorooctanesulfonic acid (8)
perfluorooctanoic acid (8)
perfluoropentanesulfonic acid (4)
perfluoropentanoic acid (4)
perfluorotetradecanoic acid (4)
perfluorotridecanoic acid (4)
perfluoroundecanoic acid (4)
profenofos (4)
quinoline (4)
s-ethyl-dipropylthiocarbamate (EPTC) (4)
strontium (8)
tebuconazole (4)
terbacil (4)
testosterone (4)
total microcystins (8)
Total Permethrin (4)
tribufos (4)
vanadium (8)

1,1-dichloroethane (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

1,2,3-trichloropropane (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

1,3-butadiene (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.1 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.1 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.1 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.1 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

1,4-dioxane (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

1-butanol (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<2 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<2 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<2 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<2 µg/L

Below Reporting Level

5/3/2018

8 years ago

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

Contaminant Details

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

17-alpha-ethynylestradiol (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0009 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0009 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0009 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0009 µg/L

Below Reporting Level

4/2/2013

13 years ago

Minimum Reporting Level: 0.0009 µg/L
Reference Level: ?

Contaminant Details

17-beta-estradiol (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0004 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0004 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0004 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0004 µg/L

Below Reporting Level

4/2/2013

13 years ago

Minimum Reporting Level: 0.0004 µg/L
Reference Level: ?

Contaminant Details

1H,1H,2H,2H-perfluorodecane sulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

1H,1H,2H,2H-perfluorohexane sulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

1H,1H,2H,2H-perfluorooctane sulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

2,4-dinitrotoluene (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

2,6-dinitrotoluene (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

2-methoxyethanol (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.4 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.4 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.4 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.4 µg/L

Below Reporting Level

5/3/2018

8 years ago

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

Contaminant Details

2-propen-1-ol (Allyl Alcohol) (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.5 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.5 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.5 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.5 µg/L

Below Reporting Level

5/3/2018

8 years ago

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

Contaminant Details

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

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.8 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.8 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.8 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.8 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

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

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

4-androstene-3,17-dione (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0003 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0003 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0003 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0003 µg/L

Below Reporting Level

4/2/2013

13 years ago

Minimum Reporting Level: 0.0003 µg/L
Reference Level: ?

Contaminant Details

9-chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

alpha-hexachlorocyclohexane (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

anatoxin-a (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/9/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/18/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/22/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

5/7/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/16/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/2/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

3/19/2018

8 years ago

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

Contaminant Details

bromochloromethane (Halon 1011) (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.06 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.083 µg/L

⚠️ Exceeds Reporting Level of 0.06 µg/L by 0.023 µg/L

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.12 µg/L

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

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.15 µg/L

⚠️ Exceeds Reporting Level of 0.06 µg/L by 0.09 µg/L

4/2/2013

13 years ago

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

Contaminant Details

bromomethane (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

Butylated Hydroxyanisole (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/16/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

3/19/2018

8 years ago

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

Contaminant Details

chlorate (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

44 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 24 µg/L

1/9/2014

12 years ago

Silverado Sample Station

Distribution System ℹ️

39 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 19 µg/L

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

26 µg/L

⚠️ Exceeds Reporting Level of 20 µg/L by 6 µg/L

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

<20 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<20 µg/L

Below Reporting Level

7/10/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

<20 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<20 µg/L

Below Reporting Level

4/2/2013

13 years ago

Silverado Sample Station

Distribution System ℹ️

<20 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

chlorodifluoromethane (HCFC-22) (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.08 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.08 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.08 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.08 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

chloromethane (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

chlorpyrifos (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

chromium (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

1/9/2014

12 years ago

Silverado Sample Station

Distribution System ℹ️

<0.2 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

<0.2 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

7/10/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

<0.2 µg/L

Below Reporting Level

7/10/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

0.52 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 0.32 µg/L

4/2/2013

13 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.3 µg/L

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

4/2/2013

13 years ago

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

Contaminant Details

chromium-6 (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.062 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.032 µg/L

1/9/2014

12 years ago

Silverado Sample Station

Distribution System ℹ️

0.056 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.026 µg/L

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.1 µg/L

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

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

0.088 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.058 µg/L

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

0.094 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.064 µg/L

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.088 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.058 µg/L

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

0.099 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.069 µg/L

4/2/2013

13 years ago

Silverado Sample Station

Distribution System ℹ️

0.09 µg/L

⚠️ Exceeds Reporting Level of 0.03 µg/L by 0.06 µg/L

4/2/2013

13 years ago

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

Contaminant Details

cobalt (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<1 µg/L

Below Reporting Level

1/9/2014

12 years ago

Silverado Sample Station

Distribution System ℹ️

<1 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<1 µg/L

Below Reporting Level

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

<1 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<1 µg/L

Below Reporting Level

7/10/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

<1 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<1 µg/L

Below Reporting Level

4/2/2013

13 years ago

Silverado Sample Station

Distribution System ℹ️

<1 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

cylindrospermopsin (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

7/9/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

6/18/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

5/22/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

5/7/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

4/16/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

4/2/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

3/19/2018

8 years ago

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

Contaminant Details

dimethipin (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

dimethyl tetrachloroterephthalate (DCPA) mono/di-acid degradate (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

equilin (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

estriol (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0008 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0008 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0008 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0008 µg/L

Below Reporting Level

4/2/2013

13 years ago

Minimum Reporting Level: 0.0008 µg/L
Reference Level: ?

Contaminant Details

estrone (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

ethoprop (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

Germanium (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

HAA5 (five regulated haloacetic acids) (30)

Canal Park

Antioch Distribution System ℹ️

7.46 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

6.9 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

6.09 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

6 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

5.96 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

5.85 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

5.73 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

5.59 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

3.2 µg/L

Meets Reporting Threshold

9/5/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

3.06 µg/L

Meets Reporting Threshold

9/5/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

3.04 µg/L

Meets Reporting Threshold

9/5/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

3.04 µg/L

Meets Reporting Threshold

9/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

2.65 µg/L

Meets Reporting Threshold

9/5/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

2.18 µg/L

Meets Reporting Threshold

9/5/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

3.161 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

2.58 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

2.508 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

1.96 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

1.78 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

1.78 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Canal Park

Antioch Distribution System ℹ️

1.77 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

1.69 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

11.9 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Marchetti Park

Antioch Distribution System ℹ️

11.18 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Canal Park

Antioch Distribution System ℹ️

8.38 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Wolverine Way

Antioch Distribution System ℹ️

7.983 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

7.5 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Silverado Drive

Antioch Distribution System ℹ️

7.4 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Service Road

Antioch Distribution System ℹ️

5.907 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

5.878 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

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

Contaminant Details

HAA6Br (six brominated haloacetic acids) (30)

Marchetti Park

Antioch Distribution System ℹ️

7.4 µg/L

12/4/2018

7 years ago

Canal Park

Antioch Distribution System ℹ️

6.3 µg/L

12/4/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

6.3 µg/L

12/4/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

6.2 µg/L

12/4/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

6.1 µg/L

12/4/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

6.1 µg/L

12/4/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

6.07 µg/L

12/4/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

6 µg/L

12/4/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

4.39 µg/L

9/5/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

3.84 µg/L

9/5/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

3.49 µg/L

9/5/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

3.42 µg/L

9/5/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

3.35 µg/L

9/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

3.26 µg/L

9/5/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

1.711 µg/L

6/5/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

1.351 µg/L

6/5/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

1.204 µg/L

6/5/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

0.907 µg/L

6/5/2018

7 years ago

Canal Park

Antioch Distribution System ℹ️

0.851 µg/L

6/5/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

0.786 µg/L

6/5/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

0.719 µg/L

6/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

0.711 µg/L

6/5/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

11.79 µg/L

3/5/2018

8 years ago

Fairview Park

Antioch Distribution System ℹ️

11.53 µg/L

3/5/2018

8 years ago

Marchetti Park

Antioch Distribution System ℹ️

11.41 µg/L

3/5/2018

8 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

11.29 µg/L

3/5/2018

8 years ago

Canal Park

Antioch Distribution System ℹ️

10.94 µg/L

3/5/2018

8 years ago

Service Road

Antioch Distribution System ℹ️

8.87 µg/L

3/5/2018

8 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

7.471 µg/L

3/5/2018

8 years ago

Wolverine Way

Antioch Distribution System ℹ️

7.43 µg/L

3/5/2018

8 years ago

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

Contaminant Details

HAA9 (nine haloacetic acids) (30)

Marchetti Park

Antioch Distribution System ℹ️

12.9 µg/L

12/4/2018

7 years ago

Canal Park

Antioch Distribution System ℹ️

12.46 µg/L

12/4/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

10.99 µg/L

12/4/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

10.85 µg/L

12/4/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

10.8 µg/L

12/4/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

10.73 µg/L

12/4/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

10.63 µg/L

12/4/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

10.29 µg/L

12/4/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

6.49 µg/L

9/5/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

6.04 µg/L

9/5/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

5.89 µg/L

9/5/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

5.75 µg/L

9/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

5.26 µg/L

9/5/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

4.82 µg/L

9/5/2018

7 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

4.361 µg/L

6/5/2018

7 years ago

Wolverine Way

Antioch Distribution System ℹ️

3.541 µg/L

6/5/2018

7 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

3.384 µg/L

6/5/2018

7 years ago

Marchetti Park

Antioch Distribution System ℹ️

2.746 µg/L

6/5/2018

7 years ago

Silverado Drive

Antioch Distribution System ℹ️

2.687 µg/L

6/5/2018

7 years ago

Canal Park

Antioch Distribution System ℹ️

2.621 µg/L

6/5/2018

7 years ago

Service Road

Antioch Distribution System ℹ️

2.499 µg/L

6/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

2.401 µg/L

6/5/2018

7 years ago

Fairview Park

Antioch Distribution System ℹ️

21.03 µg/L

3/5/2018

8 years ago

Marchetti Park

Antioch Distribution System ℹ️

20.02 µg/L

3/5/2018

8 years ago

Canal Park

Antioch Distribution System ℹ️

16.85 µg/L

3/5/2018

8 years ago

Silverado Drive

Antioch Distribution System ℹ️

16.71 µg/L

3/5/2018

8 years ago

Mira Vista Hills

Antioch Distribution System ℹ️

16.38 µg/L

3/5/2018

8 years ago

Wolverine Way

Antioch Distribution System ℹ️

13.543 µg/L

3/5/2018

8 years ago

Service Road

Antioch Distribution System ℹ️

12.737 µg/L

3/5/2018

8 years ago

Sanger Peak Way

Antioch Distribution System ℹ️

11.399 µg/L

3/5/2018

8 years ago

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

Contaminant Details

hexafluoropropylene oxide dimer acid (GenX) (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

lithium (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<9 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<9 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<9 µg/L

Below Reporting Level

2/5/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<9 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

Manganese (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

1 µg/L

Meets Reporting Threshold

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

3.8 µg/L

Meets Reporting Threshold

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

7.78 µg/L

Meets Reporting Threshold

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

1.85 µg/L

Meets Reporting Threshold

3/5/2018

8 years ago

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

Contaminant Details

methyl-tertiary-butyl-ether (MTBE) (2)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<5 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<5 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

molinate (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.9 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.9 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.9 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<0.9 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

molybdenum (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

1.2 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.2 µg/L

1/9/2014

12 years ago

Silverado Sample Station

Distribution System ℹ️

1.2 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.2 µg/L

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

1.1 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.1 µg/L

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

1 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0 µg/L

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

1 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0 µg/L

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<1 µg/L

Below Reporting Level

7/10/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

1.1 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0.1 µg/L

4/2/2013

13 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

1 µg/L

⚠️ Exceeds Reporting Level of 1 µg/L by 0 µg/L

4/2/2013

13 years ago

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

Contaminant Details

N-ethyl perfluorooctanesulfonamidoacetic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

2/5/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

N-methyl perfluorooctanesulfonamidoacetic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.006 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.006 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.006 µg/L

Below Reporting Level

2/5/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.006 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

nitrobenzene (2)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<10 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<10 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

nonafluoro-3,6-dioxaheptanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

o-toluidine (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

10/16/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

3/19/2018

8 years ago

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

Contaminant Details

oxyfluorfen (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.05 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.05 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.05 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.05 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

perchlorate (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<4 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<4 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<4 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<4 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

perfluoro(2-ethoxyethane)sulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluoro-3-methoxypropanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluoro-4-methoxybutanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluorobutanesulfonic acid (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.09 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

perfluorobutanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.005 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluorodecanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluorododecanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluoroheptanesulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluoroheptanoic acid (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.01 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

perfluorohexanesulfonic acid (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.03 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

perfluorohexanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluorononanoic acid (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

11/14/2023

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

perfluorooctanesulfonic acid (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

11/14/2023

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

perfluorooctanoic acid (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

11/14/2023

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

4/2/2013

13 years ago

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

Contaminant Details

perfluoropentanesulfonic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.004 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluoropentanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.003 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluorotetradecanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.008 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.008 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.008 µg/L

Below Reporting Level

2/5/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.008 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluorotridecanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

2/5/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.007 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

perfluoroundecanoic acid (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

8/5/2024

21 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

5/6/2024

24 months ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

2/15/2024

2 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.002 µg/L

Below Reporting Level

11/14/2023

2 years ago

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

Contaminant Details

profenofos (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

quinoline (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

10/16/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.02 µg/L

Below Reporting Level

3/19/2018

8 years ago

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

Contaminant Details

s-ethyl-dipropylthiocarbamate (EPTC) (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<1 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

strontium (8)

Silverado Sample Station

Distribution System ℹ️

180 µg/L

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

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

160 µg/L

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

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

150 µg/L

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

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

140 µg/L

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

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

110 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 109.7 µg/L

7/10/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

110 µg/L

⚠️ Exceeds Reporting Level of 0.3 µg/L by 109.7 µg/L

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

190 µg/L

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

4/2/2013

13 years ago

Silverado Sample Station

Distribution System ℹ️

190 µg/L

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

4/2/2013

13 years ago

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

Contaminant Details

tebuconazole (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.2 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

terbacil (4)

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

11/6/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

8/20/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

5/21/2002

23 years ago

CONTRA COSTA CANAL/ D07/001-TREAT

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP ℹ️

<2 µg/L

Below Reporting Level

2/25/2002

24 years ago

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

Contaminant Details

testosterone (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0001 µg/L

Below Reporting Level

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0001 µg/L

Below Reporting Level

10/2/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0001 µg/L

Below Reporting Level

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.0001 µg/L

Below Reporting Level

4/2/2013

13 years ago

Minimum Reporting Level: 0.0001 µg/L
Reference Level: ?

Contaminant Details

total microcystins (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

7/9/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

6/18/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

5/22/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

5/7/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

4/16/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

4/2/2018

8 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.3 µg/L

Below Reporting Level

3/19/2018

8 years ago

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

Contaminant Details

Total Permethrin (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.04 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

tribufos (4)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

12/4/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

9/12/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

6/5/2018

7 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

<0.07 µg/L

Below Reporting Level

3/5/2018

8 years ago

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

Contaminant Details

vanadium (8)

Antioch WTP Combined Effluent

Antioch WTP ℹ️

1.4 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 1.2 µg/L

1/9/2014

12 years ago

Silverado Sample Station

Distribution System ℹ️

1.4 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 1.2 µg/L

1/9/2014

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

2.8 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 2.6 µg/L

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

2.4 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 2.2 µg/L

10/2/2013

12 years ago

Silverado Sample Station

Distribution System ℹ️

3.4 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 3.2 µg/L

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

3.3 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 3.1 µg/L

7/10/2013

12 years ago

Antioch WTP Combined Effluent

Antioch WTP ℹ️

3 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 2.8 µg/L

4/2/2013

13 years ago

Silverado Sample Station

Distribution System ℹ️

2.7 µg/L

⚠️ Exceeds Reporting Level of 0.2 µg/L by 2.5 µg/L

4/2/2013

13 years ago

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

Contaminant Details

Sampling Facilities

Antioch WTP
Surface Water (SW)

Antioch WTP Combined EffluentEntry Point to the Distribution System (EP)

Antioch Distribution System
Surface Water (SW)

Canal ParkDistribution System (DS)

Silverado DriveDistribution System (DS)

Service RoadDistribution System (DS)

Fairview ParkDistribution System (DS)

Marchetti ParkDistribution System (DS)

Mira Vista HillsDistribution System (DS)

Wolverine WayDistribution System (DS)

Sanger Peak WayDistribution System (DS)

Distribution System
Surface Water (SW)

Silverado Sample StationMaximum Residence Time (MR)

CONTRA COSTA CANAL/MUNI RES-ANTIOCH WTP
Surface Water (SW)

CONTRA COSTA CANAL/ D07/001-TREATEntry Point to the Distribution System (EP)

FAQ

Is City of Antioch tap water safe to drink?

When was City of Antioch last tested for water contamination?

The latest water samples were taken on August 5th, 2024.