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California-American Larkfield (Puc)

EPA monitoring tested this supplier for 111 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

111
contaminants tested
15
detected
7,913
people served
2
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.

2
health-based violations
3
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 1998-07-01 → 1998-07-31
MCL Health-based Resolved 1998-07-01 → 1998-07-31
Other Monitoring Archived 1988-08-01 → 1988-08-31

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 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Arsenic
10 µg/L 100%
of the EPA limit 10 µg/L
worst single sample: 15 µg/L
492/494 SYR4 2012–2019
Lead
0.0060 mg/L 40%
of the EPA limit 0.0150 mg/L
 38/38 LCR 2025
Fluoride
183 µg/L 4.6%
of the EPA limit 4000 µg/L
worst single sample: 190 µg/L
15/15 SYR4 2012–2018
Barium
200 µg/L 10%
of the EPA limit 2000 µg/L
 12/16 SYR4 2012–2018
TTHM
25.88 µg/L 32%
of the EPA limit 80 µg/L
worst single sample: 30 µg/L
9/9 SYR4 2012–2019
Bromodichloromethane
6.355 µg/L
No EPA limit set
worst single sample: 6.6 µg/L
8/9 SYR4 2012–2019
Bromoform
2.4 µg/L
No EPA limit set
 8/9 SYR4 2012–2019
Chloroform
4.19 µg/L
No EPA limit set
worst single sample: 4.4 µg/L
8/9 SYR4 2012–2019
Dibromochloromethane
6.9 µg/L
No EPA limit set
 8/9 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
5.715 µg/L 9.5%
of the EPA limit 60 µg/L
worst single sample: 6.1 µg/L
8/8 SYR4 2012–2019
Dibromoacetic Acid
2.98 µg/L
No EPA limit set
worst single sample: 3.1 µg/L
7/7 SYR4 2012–2019
Dichloroacetic Acid
2.82 µg/L
No EPA limit set
worst single sample: 3 µg/L
7/7 SYR4 2012–2019
Nitrate
150 µg/L 1.5%
of the EPA limit 10000 µg/L
 4/88 SYR4 2012–2019
Trichloroacetic Acid
1.285 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
2/7 SYR4 2012–2019
Lithium
13.2 µg/L
No EPA limit set
 2/4 UCMR-5 2023
96 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-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
FOSTER, AUDIE
Phone
916-568-4259
Email
[email protected]

Frequently asked questions about California-American Larkfield (Puc)

Is California-American Larkfield (Puc) tap water safe to drink?

EPA monitoring detected 15 contaminants in California-American Larkfield (Puc)'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 California-American Larkfield (Puc)'s water?

EPA monitoring detected Arsenic, Lead, Fluoride, Barium, TTHM, and others. The full list with the level and data source for each is above.

How many people does California-American Larkfield (Puc) serve?

California-American Larkfield (Puc) reports serving 7,913 people in California, per its EPA record.

Has California-American Larkfield (Puc) had any water quality violations?

The EPA has 3 violations on file for California-American Larkfield (Puc), of which 2 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.