Golden State Water Co. - Willowbrook (CA) Water Quality

Golden State Water Co. - Willowbrook is a large public water system in EPA region 9 that provides tap water for the 90059, 90262 zip codes. It has 3 facilities where the water supply was tested for 50 chemical contaminants that impact tap water quality and human health.

The maximum reported level of HAA5 (five regulated haloacetic acids) was 1.48 µg/L. The maximum reported level of Manganese was 3.7 µg/L. There were 2 contamintants found in the Golden State Water Co. - Willowbrook water supply at levels that were above the minimum reporting level.

Contaminants

1-butanol (2)

Willowbrook EP

Willowbrook Plant ℹ️

<2 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<2 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

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

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

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

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

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

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

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

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

2-methoxyethanol (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.4 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.4 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

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

Willowbrook EP

Willowbrook Plant ℹ️

<0.5 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.5 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

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

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

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

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.002 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.002 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.002 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.002 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

alpha-hexachlorocyclohexane (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.01 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.01 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

Butylated Hydroxyanisole (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.03 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.03 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

chlorpyrifos (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.03 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.03 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

dimethipin (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.2 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.2 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

ethoprop (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.03 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.03 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

Germanium (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.3 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.3 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

HAA5 (five regulated haloacetic acids) (16)

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

1.36 µg/L

Meets Reporting Threshold

11/3/2020

5 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.25 µg/L

Meets Reporting Threshold

11/3/2020

5 years ago

2308 119th St.

Stage 2 DBPs ℹ️

1.17 µg/L

Meets Reporting Threshold

11/3/2020

5 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

1.12 µg/L

Meets Reporting Threshold

11/3/2020

5 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

1.48 µg/L

Meets Reporting Threshold

8/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.3 µg/L

Meets Reporting Threshold

8/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

1.18 µg/L

Meets Reporting Threshold

8/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

1.13 µg/L

Meets Reporting Threshold

8/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

0.79 µg/L

Meets Reporting Threshold

5/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

0.69 µg/L

Meets Reporting Threshold

5/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.65 µg/L

Meets Reporting Threshold

5/4/2020

6 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

0.26 µg/L

Meets Reporting Threshold

5/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.44 µg/L

Meets Reporting Threshold

2/4/2020

6 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

0.96 µg/L

Meets Reporting Threshold

2/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

0.59 µg/L

Meets Reporting Threshold

2/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.52 µg/L

Meets Reporting Threshold

2/4/2020

6 years ago

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

Contaminant Details

HAA6Br (six brominated haloacetic acids) (16)

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

0.77 µg/L

11/3/2020

5 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

0.76 µg/L

11/3/2020

5 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.34 µg/L

11/3/2020

5 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

0.31 µg/L

11/3/2020

5 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

1.12 µg/L

8/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

0.48 µg/L

8/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

0.44 µg/L

8/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.42 µg/L

8/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.21 µg/L

5/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.38 µg/L

5/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

0.38 µg/L

5/4/2020

6 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

0 µg/L

5/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.18 µg/L

2/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

1.02 µg/L

2/4/2020

6 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

0.64 µg/L

2/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.63 µg/L

2/4/2020

6 years ago

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

Contaminant Details

HAA9 (nine haloacetic acids) (16)

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

1.69 µg/L

11/3/2020

5 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.59 µg/L

11/3/2020

5 years ago

2308 119th St.

Stage 2 DBPs ℹ️

1.17 µg/L

11/3/2020

5 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

1.12 µg/L

11/3/2020

5 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

2.04 µg/L

8/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.3 µg/L

8/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

1.18 µg/L

8/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

1.13 µg/L

8/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

1.51 µg/L

5/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

0.69 µg/L

5/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.65 µg/L

5/4/2020

6 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

0.26 µg/L

5/4/2020

6 years ago

2438 E. 130th St.

Stage 2 DBPs ℹ️

2.18 µg/L

2/4/2020

6 years ago

1949 El Segundo Blvd.

Stage 2 DBPs ℹ️

1.28 µg/L

2/4/2020

6 years ago

2304 N Wilmington Ave.

Stage 2 DBPs ℹ️

1.23 µg/L

2/4/2020

6 years ago

2308 119th St.

Stage 2 DBPs ℹ️

0.83 µg/L

2/4/2020

6 years ago

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

Contaminant Details

hexafluoropropylene oxide dimer acid (GenX) (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

lithium (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

42 µg/L

⚠️ Exceeds Reporting Level of 9 µg/L by 33 µg/L

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<9 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

9.8 µg/L

⚠️ Exceeds Reporting Level of 9 µg/L by 0.8 µg/L

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<9 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

Manganese (2)

Willowbrook EP

Willowbrook Plant ℹ️

1.6 µg/L

Meets Reporting Threshold

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

3.7 µg/L

Meets Reporting Threshold

2/4/2020

6 years ago

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

Contaminant Details

N-ethyl perfluorooctanesulfonamidoacetic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

10/10/2024

23 months ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

7/25/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

N-methyl perfluorooctanesulfonamidoacetic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.006 µg/L

Below Reporting Level

10/10/2024

23 months ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.006 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.006 µg/L

Below Reporting Level

7/25/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.006 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

nonafluoro-3,6-dioxaheptanoic acid (3)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.02 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.02 µg/L

Below Reporting Level

7/25/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.02 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

o-toluidine (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.007 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.007 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

oxyfluorfen (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.05 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.05 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

perfluoro(2-ethoxyethane)sulfonic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoro-3-methoxypropanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoro-4-methoxybutanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorobutanesulfonic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorobutanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.005 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.005 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorodecanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorododecanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoroheptanesulfonic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoroheptanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorohexanesulfonic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorohexanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorononanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorooctanesulfonic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorooctanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoropentanesulfonic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.004 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.004 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoropentanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.003 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.003 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorotetradecanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.008 µg/L

Below Reporting Level

10/10/2024

23 months ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.008 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.008 µg/L

Below Reporting Level

7/25/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.008 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluorotridecanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.007 µg/L

Below Reporting Level

10/10/2024

23 months ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.007 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.007 µg/L

Below Reporting Level

7/25/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.007 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

perfluoroundecanoic acid (4)

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.002 µg/L

Below Reporting Level

7/29/2024

25 months ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.002 µg/L

Below Reporting Level

7/25/2023

3 years ago

MWD (CB-51 EP)

MWD Intertie ℹ️

<0.002 µg/L

Below Reporting Level

5/23/2023

3 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.002 µg/L

Below Reporting Level

1/24/2023

3 years ago

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

Contaminant Details

profenofos (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.3 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.3 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

quinoline (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.02 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.02 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

tebuconazole (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.2 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.2 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

Total Permethrin (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.04 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.04 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

tribufos (2)

Willowbrook EP

Willowbrook Plant ℹ️

<0.07 µg/L

Below Reporting Level

8/10/2020

6 years ago

Willowbrook EP

Willowbrook Plant ℹ️

<0.07 µg/L

Below Reporting Level

2/4/2020

6 years ago

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

Contaminant Details

Contaminants

1-butanol (2)

11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (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-methoxyethanol (2)

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

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

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

alpha-hexachlorocyclohexane (2)

Butylated Hydroxyanisole (2)

chlorpyrifos (2)

dimethipin (2)

ethoprop (2)

Germanium (2)

HAA5 (five regulated haloacetic acids) (16)

HAA6Br (six brominated haloacetic acids) (16)

HAA9 (nine haloacetic acids) (16)

hexafluoropropylene oxide dimer acid (GenX) (4)

lithium (4)

Manganese (2)

N-ethyl perfluorooctanesulfonamidoacetic acid (4)

N-methyl perfluorooctanesulfonamidoacetic acid (4)

nonafluoro-3,6-dioxaheptanoic acid (3)

o-toluidine (2)

oxyfluorfen (2)

perfluoro(2-ethoxyethane)sulfonic acid (4)

perfluoro-3-methoxypropanoic acid (4)

perfluoro-4-methoxybutanoic acid (4)

perfluorobutanesulfonic acid (4)

perfluorobutanoic acid (4)

perfluorodecanoic acid (4)

perfluorododecanoic acid (4)

perfluoroheptanesulfonic acid (4)

perfluoroheptanoic acid (4)

perfluorohexanesulfonic acid (4)

perfluorohexanoic acid (4)

perfluorononanoic acid (4)

perfluorooctanesulfonic acid (4)

perfluorooctanoic acid (4)

perfluoropentanesulfonic acid (4)

perfluoropentanoic acid (4)

perfluorotetradecanoic acid (4)

perfluorotridecanoic acid (4)

perfluoroundecanoic acid (4)

profenofos (2)

quinoline (2)

tebuconazole (2)

Total Permethrin (2)

tribufos (2)

Sampling Facilities

Willowbrook Plant Ground Water (GW)

MWD Intertie Surface Water (SW)

Stage 2 DBPs Multiple Sources (MX)

FAQ

Is Golden State Water Co. - Willowbrook tap water safe to drink?

When was Golden State Water Co. - Willowbrook last tested for water contamination?

Willowbrook Plant
Ground Water (GW)

MWD Intertie
Surface Water (SW)

Stage 2 DBPs
Multiple Sources (MX)