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End-O-Valley Mutual Water Company

EPA monitoring tested this supplier for 69 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
5
detected
129
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
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.

4
health-based violations
17
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1998-10-01 → 1998-11-30
MCL Health-based Resolved 1998-10-01 → 1998-11-30
MCL Health-based Resolved 1997-08-01 → 1997-08-31
MCL Health-based Resolved 1997-08-01 → 1997-08-31
MR Monitoring Resolved 2022-06-01
MR Monitoring Resolved 2022-06-01
MR Monitoring Resolved 2014-09-01 → 2014-09-30
MR Monitoring Resolved 2014-09-01 → 2014-09-30
MR Monitoring Resolved 2006-01-01 → 2006-12-31
MR Monitoring Resolved 2006-01-01 → 2006-12-31

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
1220.4 µg/L 12%
of the EPA limit 10000 µg/L
 16/18 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
Dichloroacetic Acid
10.7 µg/L
No EPA limit set
 1/6 SYR4 2013–2019
Fluoride
220 µg/L 5.5%
of the EPA limit 4000 µg/L
 1/1 SYR4 2013
Total Haloacetic Acids (HAA5)
10.7 µg/L 18%
of the EPA limit 60 µg/L
 1/6 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, TotalArsenicAsbestosAtrazineBhc-GammaBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCadmiumCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDibromoacetic AcidDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GRAZIANO, ANITA
Phone
707-539-5697
Email
anita@agraziano.com

Frequently asked questions about End-O-Valley Mutual Water Company

Is End-O-Valley Mutual Water Company tap water safe to drink?

EPA monitoring detected 5 contaminants in End-O-Valley 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 End-O-Valley Mutual Water Company's water?

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

How many people does End-O-Valley Mutual Water Company serve?

End-O-Valley Mutual Water Company reports serving 129 people in California, per its EPA record.

Has End-O-Valley Mutual Water Company had any water quality violations?

The EPA has 17 violations on file for End-O-Valley 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.