Is Stinson Beach County Wtr Dist Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Marin

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
TT	Health-based	Resolved	1998-01-01
TT	Health-based	Resolved	1998-01-01
MCL	Health-based	Resolved	1995-06-01 → 1995-06-30
MCL	Health-based	Resolved	1995-06-01 → 1995-06-30
MR	Monitoring	Archived	2021-04-01 → 2021-06-30
MR	Monitoring	Resolved	1993-07-01 → 2000-04-04
MR	Monitoring	Resolved	1993-07-01 → 2000-04-04

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
Arsenic	13.35 µg/L 134% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 33 µg/L	194/228	SYR4	2012–2019
Nitrate	1569.7 µg/L 16% of the EPA limit 10000 µg/L worst single sample: 1898.4 µg/L	64/78	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	40/40	LCR	2023
Fluoride	267 µg/L 6.7% of the EPA limit 4000 µg/L worst single sample: 330 µg/L	27/28	SYR4	2012–2019
Bromodichloromethane	17.5 µg/L No EPA limit set worst single sample: 19 µg/L	11/11	SYR4	2012–2019
Chloroform	18.5 µg/L No EPA limit set worst single sample: 19 µg/L	11/11	SYR4	2012–2019
Dibromochloromethane	16 µg/L No EPA limit set	11/11	SYR4	2012–2019
TTHM	48.5 µg/L 61% of the EPA limit 80 µg/L worst single sample: 52 µg/L	11/11	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	32.4 µg/L 54% of the EPA limit 60 µg/L worst single sample: 34.2 µg/L	11/11	SYR4	2012–2019
Trichloroacetic Acid	18.95 µg/L No EPA limit set worst single sample: 19.3 µg/L	11/11	SYR4	2012–2019
Bromoform	4.775 µg/L No EPA limit set worst single sample: 5.9 µg/L	10/11	SYR4	2012–2019
Dibromoacetic Acid	5.663 µg/L No EPA limit set worst single sample: 5.96 µg/L	10/11	SYR4	2012–2019
Dichloroacetic Acid	11.37 µg/L No EPA limit set worst single sample: 12 µg/L	10/11	SYR4	2012–2019
Barium	146 µg/L 7.3% of the EPA limit 2000 µg/L worst single sample: 150 µg/L	3/28	SYR4	2012–2019
Monochloroacetic Acid	3.811 µg/L No EPA limit set worst single sample: 4.1 µg/L	3/11	SYR4	2012–2019
Antimony, Total	14.585 µg/L 243% of the EPA limit, at the 95th percentile of samples — 6 µg/L worst single sample: 15 µg/L	2/30	SYR4	2012–2019
Chromium	2.535 µg/L 2.5% of the EPA limit 100 µg/L worst single sample: 2.6 µg/L	2/28	SYR4	2012–2019
Ethylbenzene	14 µg/L 2% of the EPA limit 700 µg/L	1/12	SYR4	2013–2019
Monobromoacetic Acid	1.03 µg/L No EPA limit set	1/11	SYR4	2012–2019
Toluene	1.9 µg/L 0.2% of the EPA limit 1000 µg/L	1/12	SYR4	2013–2019
Xylenes, Total	86 µg/L 0.9% of the EPA limit 10000 µg/L	1/12	SYR4	2013–2019

50 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAsbestosAtrazineBhc-GammaBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: NELSON, KENT
Phone: 415-868-1333
Email: knelson@stinsonwater.org

Frequently asked questions about Stinson Beach County Wtr Dist

Is Stinson Beach County Wtr Dist tap water safe to drink?

EPA monitoring detected 21 contaminants in Stinson Beach County Wtr Dist'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 Stinson Beach County Wtr Dist's water?

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

How many people does Stinson Beach County Wtr Dist serve?

Stinson Beach County Wtr Dist reports serving 583 people in California, per its EPA record.

Has Stinson Beach County Wtr Dist had any water quality violations?

The EPA has 7 violations on file for Stinson Beach County Wtr Dist, of which 4 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.