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Tap water quality report

Los Angeles Cwwd 40 Reg 4 & 34 Lancaster

EPA monitoring tested this supplier for 115 contaminants and detected 24. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

115
contaminants tested
24
detected
208,129
people served
2
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Local government
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
8
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1992-12-01 → 1992-12-31
MCL Health-based Resolved 1992-12-01 → 1992-12-31
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2003-02-01 → 2003-02-28
MR Monitoring Resolved 2003-02-01 → 2003-02-28
MR Monitoring Resolved 2003-02-01 → 2003-02-28
MR Monitoring Resolved 2003-02-01 → 2003-02-28

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
Arsenic
28.77 µg/L 288%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 78.5 µg/L
2284/2751 SYR4 2012–2019
Nitrate
4102.5 µg/L 41%
of the EPA limit 10000 µg/L
worst single sample: 5514.4 µg/L
556/748 SYR4 2012–2019
Dibromochloromethane
34.925 µg/L
No EPA limit set
worst single sample: 47.9 µg/L
172/239 SYR4 2012–2019
TTHM
80.3 µg/L 100%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 126 µg/L
172/239 SYR4 2012–2019
Bromodichloromethane
18.565 µg/L
No EPA limit set
worst single sample: 37.8 µg/L
170/239 SYR4 2012–2019
Bromoform
31.27 µg/L
No EPA limit set
worst single sample: 47.4 µg/L
164/239 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
25 µg/L 42%
of the EPA limit 60 µg/L
worst single sample: 35 µg/L
161/173 SYR4 2012–2017
Chloroform
9.15 µg/L
No EPA limit set
worst single sample: 21.2 µg/L
141/239 SYR4 2012–2019
Fluoride
685.1 µg/L 17%
of the EPA limit 4000 µg/L
worst single sample: 1450 µg/L
115/115 SYR4 2012–2019
Dibromoacetic Acid
17.07 µg/L
No EPA limit set
worst single sample: 19.2 µg/L
84/96 SYR4 2014–2017
Dichloroacetic Acid
8.724 µg/L
No EPA limit set
worst single sample: 13.8 µg/L
80/96 SYR4 2014–2017
Combined Uranium
7.6735 µg/L 26%
of the EPA limit 30 µg/L
worst single sample: 11.4134 µg/L
77/166 SYR4 2012–2019
Chromium
16.1 µg/L 16%
of the EPA limit 100 µg/L
worst single sample: 35.9 µg/L
59/118 SYR4 2012–2019
Lead
0.0018 mg/L 12%
of the EPA limit 0.0150 mg/L
 45/45 LCR 2025
Nitrate-Nitrite
4540 µg/L 45%
of the EPA limit 10000 µg/L
worst single sample: 4900 µg/L
37/44 SYR4 2017–2019
Trichloroacetic Acid
4.68 µg/L
No EPA limit set
worst single sample: 8.75 µg/L
35/96 SYR4 2014–2017
Monobromoacetic Acid
2.689 µg/L
No EPA limit set
worst single sample: 2.86 µg/L
19/96 SYR4 2014–2017
Lithium
17.1 µg/L
No EPA limit set
 3/28 UCMR-5 2024
Di(2-ethylhexyl) Phthalate
10.61 µg/L 177%
of the EPA limit, at the 95th percentile of samples — 6 µg/L
worst single sample: 11 µg/L
2/291 SYR4 2012–2019
Lead
6.17 µg/L 41%
of the EPA limit 15 µg/L
worst single sample: 6.2 µg/L
2/56 SYR4 2012–2019
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 1/115 SYR4 2012–2019
Combined Radium (-226 And -228)
2.9 pCi/L 58%
of the EPA limit 5 pCi/L
 1/5 SYR4 2017–2019
Selenium
7.02 µg/L 14%
of the EPA limit 50 µg/L
 1/115 SYR4 2012–2019
Toluene
0.5710 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/277 SYR4 2012–2019
91 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-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromateChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloriteDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HERNANDEZ, CAROLINA
Phone
626-300-3300
Email
[email protected]

Frequently asked questions about Los Angeles Cwwd 40 Reg 4 & 34 Lancaster

Is Los Angeles Cwwd 40 Reg 4 & 34 Lancaster tap water safe to drink?

EPA monitoring detected 24 contaminants in Los Angeles Cwwd 40 Reg 4 & 34 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 Los Angeles Cwwd 40 Reg 4 & 34 Lancaster's water?

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

How many people does Los Angeles Cwwd 40 Reg 4 & 34 Lancaster serve?

Los Angeles Cwwd 40 Reg 4 & 34 Lancaster reports serving 208,129 people in California, per its EPA record.

Has Los Angeles Cwwd 40 Reg 4 & 34 Lancaster had any water quality violations?

The EPA has 8 violations on file for Los Angeles Cwwd 40 Reg 4 & 34 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.