Is Mark West Meadows Mutual Water Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Private
Counties served: Sonoma

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	Unaddressed	2024-10-17
RPT	Monitoring	Unaddressed	2024-10-17
MR	Monitoring	Resolved	2005-08-01 → 2005-08-31
MR	Monitoring	Resolved	2005-08-01 → 2005-08-31
MR	Monitoring	Resolved	2003-10-01 → 2003-10-31
MR	Monitoring	Resolved	2003-10-01 → 2003-10-31
MR	Monitoring	Resolved	1993-07-01 → 2003-12-31
Other	Monitoring	Archived	1984-09-01 → 1984-09-30
Other	Monitoring	Archived	1984-07-01 → 1984-07-31
MR	Monitoring	Archived	1981-10-01 → 1982-09-30

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	19/19	LCR	2024
Fluoride	210 µg/L 5.3% of the EPA limit 4000 µg/L	3/4	SYR4	2012–2019
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L	1/4	SYR4	2012–2019
Chromium	1.2 µg/L 1.2% of the EPA limit 100 µg/L	1/4	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	1.1 µg/L 1.8% of the EPA limit 60 µg/L	1/3	SYR4	2013–2019
Trichloroacetic Acid	1.1 µg/L No EPA limit set	1/3	SYR4	2013–2019

64 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDibromoacetic AcidDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: LAMPI, DAVID
Phone: 707-578-7982
Email: dlampi123@aol.com

Frequently asked questions about Mark West Meadows Mutual Water

Is Mark West Meadows Mutual Water tap water safe to drink?

EPA monitoring detected 6 contaminants in Mark West Meadows Mutual Water'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 Mark West Meadows Mutual Water's water?

EPA monitoring detected Lead, Fluoride, Arsenic, Chromium, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Mark West Meadows Mutual Water serve?

Mark West Meadows Mutual Water reports serving 20 people in California, per its EPA record.

Has Mark West Meadows Mutual Water had any water quality violations?

The EPA has 10 violations on file for Mark West Meadows Mutual Water, of which 1 is health-based (a contaminant limit or required treatment was breached) and 2 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.