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Tap water quality report

Sonoma County Csa 41-freestone

EPA monitoring tested this supplier for 69 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

69
contaminants tested
19
detected
290
people served
40
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface 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.

40
health-based violations
63
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2015-10-01 → 2015-12-31
MCL Health-based Resolved 2015-10-01 → 2015-12-31
MCL Health-based Resolved 2015-07-01 → 2015-09-30
MCL Health-based Resolved 2015-07-01 → 2015-09-30
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2015-01-01 → 2015-03-31
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2014-07-01 → 2014-09-30
MCL Health-based Resolved 2013-04-01 → 2013-06-30
MCL Health-based Resolved 2013-04-01 → 2013-06-30

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
29 µg/L
No EPA limit set
 24/25 SYR4 2012–2019
Chloroform
130 µg/L
No EPA limit set
 24/25 SYR4 2012–2019
Dibromochloromethane
24 µg/L
No EPA limit set
 24/25 SYR4 2012–2019
TTHM
150 µg/L 188%
of the EPA limit, in the worst sample — 80 µg/L
 24/25 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
159 µg/L 265%
of the EPA limit, in the worst sample — 60 µg/L
 24/24 SYR4 2012–2019
Trichloroacetic Acid
121 µg/L
No EPA limit set
 24/24 SYR4 2012–2019
Dichloroacetic Acid
62 µg/L
No EPA limit set
 23/24 SYR4 2012–2019
Lead
0.0060 mg/L 40%
of the EPA limit 0.0150 mg/L
 21/21 LCR 2025
Dibromoacetic Acid
5.6 µg/L
No EPA limit set
 20/24 SYR4 2012–2019
Nitrate
1401.2 µg/L 14%
of the EPA limit 10000 µg/L
 20/64 SYR4 2012–2019
Fluoride
410 µg/L 10%
of the EPA limit 4000 µg/L
 14/16 SYR4 2012–2019
Bromoform
6.6 µg/L
No EPA limit set
 11/25 SYR4 2012–2019
Monochloroacetic Acid
12.8 µg/L
No EPA limit set
 11/24 SYR4 2012–2019
Arsenic
18 µg/L 180%
of the EPA limit, in the worst sample — 10 µg/L
 7/16 SYR4 2012–2019
Chromium
9.3 µg/L 9.3%
of the EPA limit 100 µg/L
 7/16 SYR4 2012–2019
Barium
260 µg/L 13%
of the EPA limit 2000 µg/L
 2/16 SYR4 2012–2019
Copper
140 µg/L 11%
of the EPA limit 1300 µg/L
 1/16 SYR4 2012–2019
Monobromoacetic Acid
2.27 µg/L
No EPA limit set
 1/24 SYR4 2012–2019
Toluene
0.6000 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/7 SYR4 2012–2019
50 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-GammaBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChlordaneDichloromethaneDalaponDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HOEVERTSZ, JOHANNES
Phone
707-565-3580
Email
johannes.hoevertsz@sonoma-county.org

Frequently asked questions about Sonoma County Csa 41-freestone

Is Sonoma County Csa 41-freestone tap water safe to drink?

EPA monitoring detected 19 contaminants in Sonoma County Csa 41-freestone'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 Sonoma County Csa 41-freestone's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, TTHM, Total Haloacetic Acids (HAA5), and others. The full list with the level and data source for each is above.

How many people does Sonoma County Csa 41-freestone serve?

Sonoma County Csa 41-freestone reports serving 290 people in California, per its EPA record.

Has Sonoma County Csa 41-freestone had any water quality violations?

The EPA has 63 violations on file for Sonoma County Csa 41-freestone, of which 40 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.