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Tap water quality report

Willowside Mutual Water Company

EPA monitoring tested this supplier for 65 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

65
contaminants tested
11
detected
448
people served
0
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.

0
health-based violations
16
violations on file
0
still open
ViolationTypeStatusPeriod
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-09-01 → 2007-09-30
MR Monitoring Resolved 2007-01-01 → 2007-12-31
MR Monitoring Resolved 2007-01-01 → 2007-12-31
MR Monitoring Resolved 2007-01-01 → 2007-12-31
MR Monitoring Resolved 2007-01-01 → 2007-12-31
MR Monitoring Resolved 1996-05-01 → 1996-05-31
MR Monitoring Resolved 1996-05-01 → 1996-05-31
MR Monitoring Resolved 1995-01-01 → 1995-01-31
MR Monitoring Resolved 1995-01-01 → 1995-01-31

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
 15/15 LCR 2025
Bromodichloromethane
5.2 µg/L
No EPA limit set
 3/3 SYR4 2012–2017
Bromoform
3.1 µg/L
No EPA limit set
 3/3 SYR4 2012–2017
Chloroform
4.1 µg/L
No EPA limit set
 3/3 SYR4 2012–2017
Dibromochloromethane
8.2 µg/L
No EPA limit set
 3/3 SYR4 2012–2017
TTHM
20 µg/L 25%
of the EPA limit 80 µg/L
 3/3 SYR4 2012–2017
Nitrate
1175.2 µg/L 12%
of the EPA limit 10000 µg/L
 2/38 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
5.15 µg/L 8.6%
of the EPA limit 60 µg/L
 2/3 SYR4 2012–2017
Trichloroacetic Acid
1.24 µg/L
No EPA limit set
 2/3 SYR4 2012–2017
Dibromoacetic Acid
2.79 µg/L
No EPA limit set
 1/3 SYR4 2012–2017
Dichloroacetic Acid
1.14 µg/L
No EPA limit set
 1/3 SYR4 2012–2017
54 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCopperCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
LAGOURGUE, ERIN
Phone
707-536-1250
Email
willowsidewater@yahoo.com

Frequently asked questions about Willowside Mutual Water Company

Is Willowside Mutual Water Company tap water safe to drink?

EPA monitoring detected 11 contaminants in Willowside 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 Willowside Mutual Water Company's water?

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

How many people does Willowside Mutual Water Company serve?

Willowside Mutual Water Company reports serving 448 people in California, per its EPA record.

Has Willowside Mutual Water Company had any water quality violations?

The EPA has 16 violations on file for Willowside Mutual Water Company, 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.