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Tap water quality report

Corinthian Bay Mutual Water Company

EPA monitoring tested this supplier for 70 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

70
contaminants tested
9
detected
150
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Lake

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
20
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2001-02-01 → 2001-02-28
MCL Health-based Resolved 2001-02-01 → 2001-02-28
MCL Health-based Resolved 2001-02-01 → 2001-02-28
MCL Health-based Resolved 2001-02-01 → 2001-02-28
MR Monitoring Resolved 2023-01-01
MR Monitoring Resolved 2023-01-01
MR Monitoring Resolved 2022-07-01
MR Monitoring Resolved 2022-07-01
MON Monitoring Resolved 2022-02-01 → 2022-02-28
MON Monitoring Resolved 2022-02-01 → 2022-02-28

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
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 18/18 LCR 2025
Nitrate
1000 µg/L 10%
of the EPA limit 10000 µg/L
 8/32 SYR4 2012–2019
Barium
260 µg/L 13%
of the EPA limit 2000 µg/L
worst single sample: 270 µg/L
6/6 SYR4 2013–2019
Fluoride
205.5 µg/L 5.1%
of the EPA limit 4000 µg/L
worst single sample: 210 µg/L
4/6 SYR4 2013–2019
Chloroform
1.2705 µg/L
No EPA limit set
worst single sample: 1.3 µg/L
2/3 SYR4 2014–2018
TTHM
1.2705 µg/L 1.6%
of the EPA limit 80 µg/L
worst single sample: 1.3 µg/L
2/3 SYR4 2014–2018
Total Haloacetic Acids (HAA5)
4.36 µg/L 7.3%
of the EPA limit 60 µg/L
 2/3 SYR4 2014–2018
Dibromoacetic Acid
4.36 µg/L
No EPA limit set
 1/3 SYR4 2014–2018
Dichloroacetic Acid
4.36 µg/L
No EPA limit set
 1/3 SYR4 2014–2018
61 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-GammaBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDibromochloromethaneDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
WISKIRCHEN, JOHN
Phone
707-489-8981
Email
[email protected]

Frequently asked questions about Corinthian Bay Mutual Water Company

Is Corinthian Bay Mutual Water Company tap water safe to drink?

EPA monitoring detected 9 contaminants in Corinthian Bay 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 Corinthian Bay Mutual Water Company's water?

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

How many people does Corinthian Bay Mutual Water Company serve?

Corinthian Bay Mutual Water Company reports serving 150 people in California, per its EPA record.

Has Corinthian Bay Mutual Water Company had any water quality violations?

The EPA has 20 violations on file for Corinthian Bay Mutual Water Company, 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.