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Tap water quality report

Valley of the Moon Water District

EPA monitoring tested this supplier for 109 contaminants and detected 25. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

109
contaminants tested
25
detected
23,107
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
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.

0
health-based violations
6
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2020-01-01 → 2020-12-31
MR Monitoring Resolved 2020-01-01 → 2020-12-31
MR Monitoring Resolved 2020-01-01 → 2020-12-31
MR Monitoring Resolved 2020-01-01 → 2020-12-31
Other Monitoring Archived 1989-06-01 → 1989-06-30
Other Monitoring Archived 1988-11-01 → 1988-11-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0042 µg/L 3/14 2025
Pfhxa 0.0036 µg/L 2/14 2025
PFHXS 0.0042 µg/L 2/14 2025
PFOA 0.0052 µg/L 2/14 2025
PFOS 0.0054 µg/L 1/14 2025
Pfpea 0.0030 µg/L 1/14 2025

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
TTHM
38 µg/L 48%
of the EPA limit 80 µg/L
 127/127 SYR4 2012–2019
Bromodichloromethane
11 µg/L
No EPA limit set
 126/127 SYR4 2012–2019
Dibromochloromethane
8.6 µg/L
No EPA limit set
 126/127 SYR4 2012–2019
Chloroform
24 µg/L
No EPA limit set
 125/127 SYR4 2012–2019
Dichloroacetic Acid
9.3 µg/L
No EPA limit set
 116/127 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
14 µg/L 23%
of the EPA limit 60 µg/L
 111/127 SYR4 2012–2019
Dibromoacetic Acid
2.6 µg/L
No EPA limit set
 96/127 SYR4 2012–2019
Trichloroacetic Acid
5.4 µg/L
No EPA limit set
 62/127 SYR4 2012–2019
Bromoform
2.5 µg/L
No EPA limit set
 54/127 SYR4 2012–2019
Nitrate
3700 µg/L 37%
of the EPA limit 10000 µg/L
 50/84 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 41/41 LCR 2023
Arsenic
14 µg/L 140%
of the EPA limit, in the worst sample — 10 µg/L
 29/33 SYR4 2014–2019
Lithium
36 µg/L
No EPA limit set
 13/13 UCMR-5 2025
Copper
570 µg/L 44%
of the EPA limit 1300 µg/L
 3/12 SYR4 2014–2018
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
 2/2 SYR4 2018
Nitrate-Nitrite
3000 µg/L 30%
of the EPA limit 10000 µg/L
 2/7 SYR4 2017–2018
Methoxychlor
110 µg/L 275%
of the EPA limit, in the worst sample — 40 µg/L
 1/11 SYR4 2014–2018
Monochloroacetic Acid
2.9 µg/L
No EPA limit set
 1/127 SYR4 2012–2019
Toluene
3.5 µg/L 0.4%
of the EPA limit 1000 µg/L
 1/7 SYR4 2017–2018
84 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HUDSON, AMANDA
Phone
707-996-1037
Email
ahudson@vomwd.org

Frequently asked questions about Valley of the Moon Water District

Is Valley of the Moon Water District tap water safe to drink?

EPA monitoring detected 25 contaminants in Valley of the Moon 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 Valley of the Moon Water District's water?

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

How many people does Valley of the Moon Water District serve?

Valley of the Moon Water District reports serving 23,107 people in California, per its EPA record.

Has Valley of the Moon Water District had any water quality violations?

The EPA has 6 violations on file for Valley of the Moon 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.