Is West Valley Water District Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: San Bernardino

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Archived	1987-06-01 → 1987-06-30
MCL	Health-based	Archived	1987-06-01 → 1987-06-30
MCL	Health-based	Archived	1987-06-01 → 1987-06-30
MCL	Health-based	Archived	1987-06-01 → 1987-06-30
MCL	Health-based	Archived	1987-05-01 → 1987-05-31
MCL	Health-based	Archived	1987-05-01 → 1987-05-31
MCL	Health-based	Archived	1987-05-01 → 1987-05-31
MCL	Health-based	Archived	1987-05-01 → 1987-05-31
MCL	Health-based	Archived	1987-04-01 → 1987-04-30
MCL	Health-based	Archived	1987-04-01 → 1987-04-30

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	8588 µg/L 86% of the EPA limit 10000 µg/L worst single sample: 10622 µg/L	2904/3280	SYR4	2012–2019
Arsenic	9.2 µg/L 92% of the EPA limit 10 µg/L worst single sample: 19 µg/L	573/971	SYR4	2012–2019
TTHM	65.18 µg/L 81% of the EPA limit 80 µg/L worst single sample: 95.6 µg/L	287/383	SYR4	2012–2019
Chloroform	18.025 µg/L No EPA limit set worst single sample: 33 µg/L	276/383	SYR4	2012–2019
Bromodichloromethane	19.39 µg/L No EPA limit set worst single sample: 25.8 µg/L	252/383	SYR4	2012–2019
Dibromochloromethane	23.575 µg/L No EPA limit set worst single sample: 36.1 µg/L	242/383	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	16.04 µg/L 27% of the EPA limit 60 µg/L worst single sample: 19 µg/L	225/376	SYR4	2012–2019
Dichloroacetic Acid	6.675 µg/L No EPA limit set worst single sample: 11.8 µg/L	206/376	SYR4	2012–2019
Bromoform	14.48 µg/L No EPA limit set worst single sample: 31.7 µg/L	154/383	SYR4	2012–2019
Dibromoacetic Acid	8.24 µg/L No EPA limit set worst single sample: 10.6 µg/L	145/376	SYR4	2012–2019
Fluoride	410 µg/L 10% of the EPA limit 4000 µg/L worst single sample: 590 µg/L	144/148	SYR4	2012–2019
Trichloroacetic Acid	4.815 µg/L No EPA limit set worst single sample: 6.4 µg/L	118/376	SYR4	2012–2019
Tetrachloroethylene	1.25 µg/L 25% of the EPA limit 5 µg/L worst single sample: 2 µg/L	56/201	SYR4	2012–2019
Nitrate-Nitrite	452000 µg/L 4520% of the EPA limit, at the 95th percentile of samples — 10000 µg/L worst single sample: 780000 µg/L	33/42	SYR4	2012–2019
Combined Uranium	10.6535 µg/L 36% of the EPA limit 30 µg/L worst single sample: 17.88 µg/L	27/29	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	27/27	LCR	2024
Monobromoacetic Acid	1.29 µg/L No EPA limit set worst single sample: 1.4 µg/L	12/376	SYR4	2012–2019
Copper	83 µg/L 6.4% of the EPA limit 1300 µg/L	1/268	SYR4	2012–2019
Toluene	1.7 µg/L 0.2% of the EPA limit 1000 µg/L	1/78	SYR4	2012–2019

92 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-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: THIEL, JOHN
Phone: 909-875-3706
Email: [email protected]

Frequently asked questions about West Valley Water District

Is West Valley Water District tap water safe to drink?

EPA monitoring detected 19 contaminants in West Valley Water District'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 West Valley Water District's water?

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

How many people does West Valley Water District serve?

West Valley Water District reports serving 104,498 people in California, per its EPA record.

Has West Valley Water District had any water quality violations?

The EPA has 19 violations on file for West Valley Water District, of which 13 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.