Tap WaterIndex

← California

Tap water quality report

California Water Service Co. - Dominguez

EPA monitoring tested this supplier for 113 contaminants and detected 27. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

113
contaminants tested
27
detected
143,996
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Private
Counties served
Los Angeles

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

2
health-based violations
13
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1995-10-01 → 1995-10-31
MCL Health-based Resolved 1995-10-01 → 1995-10-31
MR Monitoring Resolved 2018-04-01 → 2018-06-30
MR Monitoring Resolved 2018-04-01 → 2018-06-30
MR Monitoring Resolved 2018-04-01 → 2018-06-30
MR Monitoring Resolved 2018-04-01 → 2018-06-30
MR Monitoring Resolved 2018-01-01 → 2018-03-31
MR Monitoring Resolved 2018-01-01 → 2018-03-31
MR Monitoring Resolved 2018-01-01 → 2018-03-31
MR Monitoring Resolved 2018-01-01 → 2018-03-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0035 µg/L 2/19 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Fluoride
879.2 µg/L 22%
of the EPA limit 4000 µg/L
worst single sample: 970 µg/L
617/619 SYR4 2012–2019
Bromodichloromethane
19.73 µg/L
No EPA limit set
worst single sample: 32.71 µg/L
397/415 SYR4 2012–2019
Chloroform
41.354 µg/L
No EPA limit set
worst single sample: 80.33 µg/L
397/415 SYR4 2012–2019
Dibromochloromethane
19.96 µg/L
No EPA limit set
worst single sample: 47.16 µg/L
397/415 SYR4 2012–2019
TTHM
77.28 µg/L 97%
of the EPA limit 80 µg/L
worst single sample: 129.6 µg/L
397/415 SYR4 2012–2019
Bromoform
8.73 µg/L
No EPA limit set
worst single sample: 58.46 µg/L
388/415 SYR4 2012–2019
Dichloroacetic Acid
15 µg/L
No EPA limit set
worst single sample: 27 µg/L
244/246 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
29 µg/L 48%
of the EPA limit 60 µg/L
worst single sample: 46 µg/L
244/246 SYR4 2012–2019
Dibromoacetic Acid
7.8 µg/L
No EPA limit set
worst single sample: 13 µg/L
241/246 SYR4 2012–2019
Trichloroacetic Acid
12 µg/L
No EPA limit set
worst single sample: 16 µg/L
227/246 SYR4 2012–2019
Lead
0.0018 mg/L 12%
of the EPA limit 0.0150 mg/L
 47/47 LCR 2023
Nitrate
435 µg/L 4.4%
of the EPA limit 10000 µg/L
 20/198 SYR4 2012–2019
Monochloroacetic Acid
15.185 µg/L
No EPA limit set
worst single sample: 38 µg/L
14/246 SYR4 2012–2019
Monobromoacetic Acid
1.83 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
10/246 SYR4 2012–2019
Trichloroethylene
3.8145 µg/L 76%
of the EPA limit 5 µg/L
worst single sample: 4.62 µg/L
10/254 SYR4 2012–2019
Dichloromethane
3.455 µg/L 69%
of the EPA limit 5 µg/L
worst single sample: 3.95 µg/L
7/254 SYR4 2012–2019
Lithium
64.7 µg/L
No EPA limit set
 6/19 UCMR-5 2025
Barium
172 µg/L 8.6%
of the EPA limit 2000 µg/L
worst single sample: 180 µg/L
5/35 SYR4 2012–2019
Selenium
39.4 µg/L 79%
of the EPA limit 50 µg/L
worst single sample: 41 µg/L
3/34 SYR4 2012–2019
Antimony, Total
0.0590 µg/L 1%
of the EPA limit 6 µg/L
 1/35 SYR4 2012–2019
Arsenic
3.604 µg/L 36%
of the EPA limit 10 µg/L
 1/35 SYR4 2012–2019
Beryllium, Total
0.0030 µg/L 0.1%
of the EPA limit 4 µg/L
 1/35 SYR4 2012–2019
Copper
15.114 µg/L 1.2%
of the EPA limit 1300 µg/L
 1/44 SYR4 2012–2019
Cadmium
0.0140 µg/L 0.3%
of the EPA limit 5 µg/L
 1/35 SYR4 2012–2019
Chromium
1.663 µg/L 1.7%
of the EPA limit 100 µg/L
 1/35 SYR4 2012–2019
Lead
0.0260 µg/L 0.2%
of the EPA limit 15 µg/L
 1/34 SYR4 2012–2019
86 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBromateChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneCombined UraniumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HENRIE, TARRAH
Phone
408-367-8490
Email
[email protected]

Frequently asked questions about California Water Service Co. - Dominguez

Is California Water Service Co. - Dominguez tap water safe to drink?

EPA monitoring detected 27 contaminants in California Water Service Co. - Dominguez's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in California Water Service Co. - Dominguez's water?

EPA monitoring detected Fluoride, Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.

How many people does California Water Service Co. - Dominguez serve?

California Water Service Co. - Dominguez reports serving 143,996 people in California, per its EPA record.

Has California Water Service Co. - Dominguez had any water quality violations?

The EPA has 13 violations on file for California Water Service Co. - Dominguez, of which 2 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.