Is Grover Beach, CA Tap Water Safe? Quality & Contaminants

What was found in Grover Beach'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-Nitrite	400000 µg/L 4000% of the EPA limit, in the worst sample — 10000 µg/L	2/3	SYR4
Nitrate	20000 µg/L 200% of the EPA limit, in the worst sample — 10000 µg/L	2/3	SYR4
Fluoride	490 µg/L 12% of the EPA limit 4000 µg/L	3/3	SYR4
Copper	220 µg/L 17% of the EPA limit 1300 µg/L	1/3	SYR4
Arsenic	120 µg/L 1200% of the EPA limit, in the worst sample — 10 µg/L	2/3	SYR4
Barium	84 µg/L 4.2% of the EPA limit 2000 µg/L	2/3	SYR4
Bromate	77 µg/L 770% of the EPA limit, in the worst sample — 10 µg/L	1/3	SYR4
TTHM	73 µg/L 91% of the EPA limit 80 µg/L	1/3	SYR4
Total Haloacetic Acids (HAA5)	56 µg/L 93% of the EPA limit 60 µg/L	1/3	SYR4
Chloroform	50 µg/L No EPA limit set	1/3	SYR4
Dichloroacetic Acid	29 µg/L No EPA limit set	1/3	SYR4
Trichloroacetic Acid	23 µg/L No EPA limit set	1/3	SYR4
Dibromochloromethane	22 µg/L No EPA limit set	1/3	SYR4
Bromodichloromethane	18 µg/L No EPA limit set	1/3	SYR4
Bromoform	17 µg/L No EPA limit set	1/3	SYR4
Dibromoacetic Acid	9.4 µg/L No EPA limit set	1/3	SYR4
Selenium	5.4 µg/L 11% of the EPA limit 50 µg/L	2/3	SYR4
Monochloroacetic Acid	3 µg/L No EPA limit set	1/3	SYR4
Chromium	2 µg/L 2% of the EPA limit 100 µg/L	1/3	SYR4
Monobromoacetic Acid	1.8 µg/L No EPA limit set	1/3	SYR4
Mercury	0.0200 µg/L 1% of the EPA limit 2 µg/L	1/3	SYR4
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	3/3	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 Grover Beach

Supplier	Population served
CITY OF GROVER BEACH PUBLIC WORKS DEPT	12,701
BASSI RANCH MUTUAL WATER CO.	85
RIM ROCK WATER COMPANY	55

Frequently asked questions about Grover Beach tap water

Is Grover Beach tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Grover Beach. 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 Grover Beach?

3 public water suppliers report drinking-water monitoring for Grover Beach, California to the EPA. Each is listed above with its population served.

What contaminants are in Grover Beach's water?

The contaminants EPA monitoring detected in Grover Beach include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Arsenic. 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.