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Tap water quality report

Graton Mutual Water

EPA monitoring tested this supplier for 70 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

70
contaminants tested
12
detected
50
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
14
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2003-06-01 → 2003-06-30
MCL Health-based Resolved 2003-06-01 → 2003-06-30
MCL Health-based Resolved 2000-09-01 → 2000-09-30
MCL Health-based Resolved 2000-09-01 → 2000-09-30
MR Monitoring Resolved 2006-01-01 → 2006-12-31
MR Monitoring Resolved 2006-01-01 → 2006-12-31
MR Monitoring Resolved 2006-01-01 → 2006-12-31
MR Monitoring Resolved 2006-01-01 → 2006-12-31
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
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 7/7 LCR 2024
Bromodichloromethane
11 µg/L
No EPA limit set
 2/2 SYR4 2014–2017
Bromoform
6 µg/L
No EPA limit set
 2/2 SYR4 2014–2017
Chloroform
6.4 µg/L
No EPA limit set
 2/2 SYR4 2014–2017
Dibromoacetic Acid
4.19 µg/L
No EPA limit set
 2/2 SYR4 2014–2017
Dibromochloromethane
10 µg/L
No EPA limit set
 2/2 SYR4 2014–2017
Dichloroacetic Acid
3.4 µg/L
No EPA limit set
 2/2 SYR4 2014–2017
Fluoride
200 µg/L 5%
of the EPA limit 4000 µg/L
 2/2 SYR4 2014–2017
Nitrate
1197.8 µg/L 12%
of the EPA limit 10000 µg/L
 2/14 SYR4 2013–2019
TTHM
29 µg/L 36%
of the EPA limit 80 µg/L
 2/2 SYR4 2014–2017
Total Haloacetic Acids (HAA5)
7.8 µg/L 13%
of the EPA limit 60 µg/L
 2/2 SYR4 2014–2017
Trichloroacetic Acid
2.2 µg/L
No EPA limit set
 1/2 SYR4 2014–2017
58 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, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
JONES, CHRISTOPHER
Phone
707-541-6233
Email
christopher@gpshoa.com

Frequently asked questions about Graton Mutual Water

Is Graton Mutual Water tap water safe to drink?

EPA monitoring detected 12 contaminants in Graton 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 Graton Mutual Water's water?

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

How many people does Graton Mutual Water serve?

Graton Mutual Water reports serving 50 people in California, per its EPA record.

Has Graton Mutual Water had any water quality violations?

The EPA has 14 violations on file for Graton Mutual Water, 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.