Is West Covina, CA Tap Water Safe? Quality & Contaminants

What was found in West Covina's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	11000 µg/L 110% of the EPA limit, in the worst sample — 10000 µg/L	2/2	SYR4
Nitrate-Nitrite	11000 µg/L 110% of the EPA limit, in the worst sample — 10000 µg/L	1/2	SYR4
Fluoride	500 µg/L 13% of the EPA limit 4000 µg/L	2/2	SYR4
Barium	150 µg/L 7.5% of the EPA limit 2000 µg/L	2/2	SYR4
TTHM	130 µg/L 163% of the EPA limit, in the worst sample — 80 µg/L	2/2	SYR4
Total Haloacetic Acids (HAA5)	76 µg/L 127% of the EPA limit, in the worst sample — 60 µg/L	2/2	SYR4
Chloroform	66 µg/L No EPA limit set	2/2	SYR4
Dibromochloromethane	55 µg/L No EPA limit set	2/2	SYR4
Trichloroacetic Acid	41 µg/L No EPA limit set	2/2	SYR4
Bromodichloromethane	36 µg/L No EPA limit set	2/2	SYR4
Dichloroacetic Acid	35 µg/L No EPA limit set	2/2	SYR4
Bromoform	34 µg/L No EPA limit set	2/2	SYR4
Combined Uranium	31.29 µg/L 104% of the EPA limit, in the worst sample — 30 µg/L	2/2	SYR4
Di(2-ethylhexyl) Phthalate	22 µg/L 367% of the EPA limit, in the worst sample — 6 µg/L	1/2	SYR4
Arsenic	19 µg/L 190% of the EPA limit, in the worst sample — 10 µg/L	1/2	SYR4
Dibromoacetic Acid	17 µg/L No EPA limit set	2/2	SYR4
Lithium	9.8 µg/L No EPA limit set	1/2	UCMR-5
Selenium	5.2 µg/L 10% of the EPA limit 50 µg/L	1/2	SYR4
Monobromoacetic Acid	1.7 µg/L No EPA limit set	1/2	SYR4
PFOA	0.0057 µg/L No EPA limit set	1/2	UCMR-5
PFBS	0.0044 µg/L No EPA limit set	1/2	UCMR-5
PFOS	0.0044 µg/L No EPA limit set	1/2	UCMR-5
Pfhxa	0.0043 µg/L No EPA limit set	1/2	UCMR-5
Pfpea	0.0040 µg/L No EPA limit set	1/2	UCMR-5
PFHXS	0.0036 µg/L No EPA limit set	1/2	UCMR-5
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	1/2	LCR

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. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving West Covina

Supplier	Population served
VALENCIA HEIGHTS WATER CO.	7,775
COVINA VALLEY WATER COMPANY - WHOLESALE	0

Frequently asked questions about West Covina tap water

Is West Covina tap water safe to drink?

EPA testing detected 26 contaminants in the water serving West Covina. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve West Covina?

2 public water suppliers report drinking-water monitoring for West Covina, California to the EPA. Each is listed above with its population served.

What contaminants are in West Covina's water?

The contaminants EPA monitoring detected in West Covina include Nitrate, Nitrate-Nitrite, Fluoride, Barium, TTHM. The full list, with the highest level found and the data source, is in the table above.

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.