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Tap water quality report

Stinson Beach, CA

EPA monitoring detected 21 contaminants across the 1 water supplier serving Stinson Beach. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
583
people served
21
contaminants found
California rankings Lead in California PFAS in California

What was found in Stinson Beach's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
1569.7 µg/L 16%
of the EPA limit 10000 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Fluoride
267 µg/L 6.7%
of the EPA limit 4000 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Barium
146 µg/L 7.3%
of the EPA limit 2000 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Xylenes, Total
86 µg/L 0.9%
of the EPA limit 10000 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
TTHM
48.5 µg/L 61%
of the EPA limit 80 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
32.4 µg/L 54%
of the EPA limit 60 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Trichloroacetic Acid
18.95 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Chloroform
18.5 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Bromodichloromethane
17.5 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Dibromochloromethane
16 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Antimony, Total
14.585 µg/L 243%
of the EPA limit, at the 95th percentile of samples — 6 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Ethylbenzene
14 µg/L 2%
of the EPA limit 700 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Arsenic
13.35 µg/L 134%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Dichloroacetic Acid
11.37 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Dibromoacetic Acid
5.663 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Bromoform
4.775 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Monochloroacetic Acid
3.811 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Chromium
2.535 µg/L 2.5%
of the EPA limit 100 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Toluene
1.9 µg/L 0.2%
of the EPA limit 1000 µg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.03 µg/L
No EPA limit set
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: STINSON BEACH COUNTY WTR DIST · 583 people · 2023
1/1 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 95th percentile of the system's samples — 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 Stinson Beach

SupplierPopulation served
STINSON BEACH COUNTY WTR DIST 583

Frequently asked questions about Stinson Beach tap water

Is Stinson Beach tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Stinson 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 Stinson Beach?

1 public water supplier report drinking-water monitoring for Stinson Beach, California to the EPA. Each is listed above with its population served.

What contaminants are in Stinson Beach's water?

The contaminants EPA monitoring detected in Stinson Beach include Nitrate, Fluoride, Barium, Xylenes, Total, TTHM. The full list, with the level at the main supplier 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.