Is Willow County Water District Tap Water Safe? Quality Report

Water source: SWP
Ownership: Local government
Counties served: Mendocino

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
MON	Monitoring	Archived	2024-08-01 → 2024-08-31
MR	Monitoring	Resolved	2021-01-01 → 2021-01-31
MR	Monitoring	Resolved	2021-01-01 → 2021-01-31
MR	Monitoring	Resolved	2021-01-01 → 2021-01-31
Other	Monitoring	Archived	1988-10-01 → 1988-10-31

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
Nitrate	1175 µg/L 12% of the EPA limit 10000 µg/L worst single sample: 1400 µg/L	66/82	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	29/29	LCR	2025
Bromodichloromethane	2.724 µg/L No EPA limit set worst single sample: 2.73 µg/L	7/8	SYR4	2013–2019
Chloroform	6.739 µg/L No EPA limit set worst single sample: 7.06 µg/L	7/8	SYR4	2013–2019
Dichloroacetic Acid	4.3 µg/L No EPA limit set	7/8	SYR4	2013–2019
TTHM	9.731 µg/L 12% of the EPA limit 80 µg/L worst single sample: 9.77 µg/L	7/8	SYR4	2013–2019
Total Haloacetic Acids (HAA5)	6.9 µg/L 12% of the EPA limit 60 µg/L	7/8	SYR4	2013–2019
Trichloroacetic Acid	2.6 µg/L No EPA limit set	7/8	SYR4	2013–2019
Dibromochloromethane	2.6025 µg/L No EPA limit set worst single sample: 2.64 µg/L	4/8	SYR4	2013–2019
Fluoride	119.5 µg/L 3% of the EPA limit 4000 µg/L worst single sample: 120 µg/L	2/6	SYR4	2013–2019
Bromoform	1.05 µg/L No EPA limit set	1/8	SYR4	2013–2019
Dibromoacetic Acid	1.4 µg/L No EPA limit set	1/8	SYR4	2013–2019

90 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: WALKER, JARED
Phone: 707-462-2666
Email: [email protected]

Frequently asked questions about Willow County Water District

Is Willow County Water District tap water safe to drink?

EPA monitoring detected 12 contaminants in Willow County Water District'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 Willow County Water District's water?

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

How many people does Willow County Water District serve?

Willow County Water District reports serving 3,797 people in California, per its EPA record.

Has Willow County Water District had any water quality violations?

The EPA has 5 violations on file for Willow County Water District, of which 0 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.