Is Rohnert Park, CA Tap Water Safe? Quality & Contaminants

What was found in Rohnert Park'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	9944 µg/L 99% of the EPA limit 10000 µg/L	5/5	SYR4
Nitrate-Nitrite	8100 µg/L 81% of the EPA limit 10000 µg/L	1/5	SYR4
Fluoride	320 µg/L 8% of the EPA limit 4000 µg/L	5/5	SYR4
Barium	180 µg/L 9% of the EPA limit 2000 µg/L	2/5	SYR4
Copper	79 µg/L 6.1% of the EPA limit 1300 µg/L	1/5	SYR4
Lithium	39 µg/L No EPA limit set	2/5	UCMR-5
TTHM	29 µg/L 36% of the EPA limit 80 µg/L	5/5	SYR4
Chloroform	17.16 µg/L No EPA limit set	5/5	SYR4
Total Haloacetic Acids (HAA5)	16.4 µg/L 27% of the EPA limit 60 µg/L	5/5	SYR4
Arsenic	14 µg/L 140% of the EPA limit, in the worst sample — 10 µg/L	4/5	SYR4
Combined Uranium	12.6948 µg/L 42% of the EPA limit 30 µg/L	1/5	SYR4
Bromodichloromethane	11 µg/L No EPA limit set	5/5	SYR4
Dibromochloromethane	10 µg/L No EPA limit set	5/5	SYR4
Dichloroacetic Acid	8.6 µg/L No EPA limit set	3/5	SYR4
Lead	8.6 µg/L 57% of the EPA limit 15 µg/L	1/5	SYR4
Trichloroacetic Acid	7.8 µg/L No EPA limit set	3/5	SYR4
Bromoform	6 µg/L No EPA limit set	3/5	SYR4
Selenium	5.1 µg/L 10% of the EPA limit 50 µg/L	1/5	SYR4
Dibromoacetic Acid	4.19 µg/L No EPA limit set	3/5	SYR4
Xylenes, Total	3.3 µg/L 0% of the EPA limit 10000 µg/L	1/5	SYR4
Monochloroacetic Acid	2.2 µg/L No EPA limit set	1/5	SYR4
Toluene	1 µg/L 0.1% of the EPA limit 1000 µg/L	1/5	SYR4
6:2 Fts	0.0071 µg/L No EPA limit set	1/5	UCMR-5
PFHXS	0.0057 µg/L No EPA limit set	1/5	UCMR-5
PFOS	0.0045 µg/L No EPA limit set	1/5	UCMR-5
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	5/5	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 Rohnert Park

Supplier	Population served
ROHNERT PARK, CITY OF	43,821
SONOMA STATE UNIVERSITY	10,986
TERRACE VIEW WATER SYSTEM	60
GRATON MUTUAL WATER SYSTEM	50
ROLLING OAKS ROAD ASSOCIATION	25

Frequently asked questions about Rohnert Park tap water

Is Rohnert Park tap water safe to drink?

EPA testing detected 26 contaminants in the water serving Rohnert Park. 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 Rohnert Park?

5 public water suppliers report drinking-water monitoring for Rohnert Park, California to the EPA. Each is listed above with its population served.

What contaminants are in Rohnert Park's water?

The contaminants EPA monitoring detected in Rohnert Park include Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper. 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.