Tap WaterIndex

← California

Tap water quality report

California Water Service Co.-Lancaster

EPA monitoring tested this supplier for 93 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

93
contaminants tested
19
detected
1,387
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
6
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1994-01-01 → 1994-01-31
MCL Health-based Resolved 1994-01-01 → 1994-01-31
MR Monitoring Resolved 2014-01-01 → 2014-03-31
MR Monitoring Resolved 2014-01-01 → 2014-03-31
MR Monitoring Resolved 2014-01-01 → 2014-03-31
MR Monitoring Resolved 2014-01-01 → 2014-03-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
70 µg/L 88%
of the EPA limit 80 µg/L
 33/44 SYR4 2014–2019
Nitrate
2638.098 µg/L 26%
of the EPA limit 10000 µg/L
 32/32 SYR4 2012–2019
Bromoform
16.37 µg/L
No EPA limit set
 27/44 SYR4 2014–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 23/23 LCR 2023
Dibromochloromethane
35 µg/L
No EPA limit set
 9/44 SYR4 2014–2019
Bromodichloromethane
16 µg/L
No EPA limit set
 5/44 SYR4 2014–2019
Chloroform
5.9 µg/L
No EPA limit set
 5/44 SYR4 2014–2019
Fluoride
470 µg/L 12%
of the EPA limit 4000 µg/L
 5/5 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
45 µg/L 75%
of the EPA limit 60 µg/L
 5/34 SYR4 2015–2019
Arsenic
3.4 µg/L 34%
of the EPA limit 10 µg/L
 4/5 SYR4 2013–2019
Dichloroacetic Acid
25 µg/L
No EPA limit set
 4/34 SYR4 2015–2019
Trichloroacetic Acid
17 µg/L
No EPA limit set
 4/34 SYR4 2015–2019
Dibromoacetic Acid
12 µg/L
No EPA limit set
 3/34 SYR4 2015–2019
Monobromoacetic Acid
1.4 µg/L
No EPA limit set
 2/34 SYR4 2015–2019
Monochloroacetic Acid
3.8 µg/L
No EPA limit set
 2/34 SYR4 2015–2019
Nitrate-Nitrite
1600 µg/L 16%
of the EPA limit 10000 µg/L
 2/2 SYR4 2017–2019
Chromium
10 µg/L 10%
of the EPA limit 100 µg/L
 1/5 SYR4 2013–2019
Combined Uranium
1.13836 µg/L 3.8%
of the EPA limit 30 µg/L
 1/1 SYR4 2014
Lithium
9.08 µg/L
No EPA limit set
 1/4 UCMR-5 2023
74 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateEthylene DibromideEthylbenzeneHexachlorobenzeneHfpo-DaHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
JAMES, SOPHIE
Phone
408-367-8593
Email
sjames@calwater.com

Frequently asked questions about California Water Service Co.-Lancaster

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

EPA monitoring detected 19 contaminants in California Water Service Co.-Lancaster'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.-Lancaster's water?

EPA monitoring detected TTHM, Nitrate, Bromoform, Lead, Dibromochloromethane, and others. The full list with the level and data source for each is above.

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

California Water Service Co.-Lancaster reports serving 1,387 people in California, per its EPA record.

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

The EPA has 6 violations on file for California Water Service Co.-Lancaster, 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.