Is Hills Ranch Mutual Water Company Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
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
MCL	Health-based	Resolved	2005-10-01 → 2005-12-31
MCL	Health-based	Resolved	2005-10-01 → 2005-12-31
MCL	Health-based	Resolved	2005-04-01 → 2005-06-30
MCL	Health-based	Resolved	2005-04-01 → 2005-06-30

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
Lead	0.0160 mg/L 107% above the EPA limit of 0.0150 mg/L	37/37	LCR	2025
Nitrate	1423.8 µg/L 14% of the EPA limit 10000 µg/L	16/62	SYR4	2012–2019
Fluoride	268 µg/L 6.7% of the EPA limit 4000 µg/L worst single sample: 270 µg/L	5/6	SYR4	2012–2019
Bromoform	53.9205 µg/L No EPA limit set worst single sample: 54.9 µg/L	4/4	SYR4	2012–2017
Dibromoacetic Acid	8.84 µg/L No EPA limit set worst single sample: 8.9 µg/L	4/4	SYR4	2012–2017
Dibromochloromethane	4.755 µg/L No EPA limit set worst single sample: 5.1 µg/L	4/4	SYR4	2012–2017
TTHM	58.9325 µg/L 74% of the EPA limit 80 µg/L worst single sample: 60.5 µg/L	4/4	SYR4	2012–2017
Total Haloacetic Acids (HAA5)	8.84 µg/L 15% of the EPA limit 60 µg/L worst single sample: 8.9 µg/L	4/4	SYR4	2012–2017
Copper	62 µg/L 4.8% of the EPA limit 1300 µg/L	1/5	SYR4	2012–2019
Chromium	110 µg/L 110% of the EPA limit, at the 95th percentile of samples — 100 µg/L	1/7	SYR4	2012–2019

62 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBeryllium, TotalBromodichloromethaneChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: KELLER, RICK
Phone: 415-668-1950
Email: pmkeller@mcn.org

Frequently asked questions about Hills Ranch Mutual Water Company

Is Hills Ranch Mutual Water Company tap water safe to drink?

EPA monitoring detected 10 contaminants in Hills Ranch Mutual Water Company'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 Hills Ranch Mutual Water Company's water?

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

How many people does Hills Ranch Mutual Water Company serve?

Hills Ranch Mutual Water Company reports serving 79 people in California, per its EPA record.

Has Hills Ranch Mutual Water Company had any water quality violations?

The EPA has 4 violations on file for Hills Ranch Mutual Water Company, 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.