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Tap water quality report

Bassi Ranch Mutual Water Co.

EPA monitoring tested this supplier for 42 contaminants and detected 8. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

42
contaminants tested
8
detected
85
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
San Luis Obispo

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
12
violations on file
1
still open
ViolationTypeStatusPeriod
MR Monitoring Addressed 2025-10-01
MR Monitoring Resolved 2023-01-01 → 2023-12-31
MR Monitoring Resolved 2023-01-01 → 2023-12-31
MR Monitoring Resolved 2021-10-01
MR Monitoring Resolved 2021-10-01
MR Monitoring Resolved 2019-07-01
MR Monitoring Resolved 2019-07-01
MR Monitoring Resolved 2019-01-01 → 2019-12-31
MR Monitoring Resolved 2019-01-01 → 2019-12-31
MR Monitoring Resolved 2018-01-01

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
Bromate
77 µg/L 770%
of the EPA limit, in the worst sample — 10 µg/L
 23/60 SYR4 2012–2019
Fluoride
290 µg/L 7.2%
of the EPA limit 4000 µg/L
 6/7 SYR4 2012–2019
Nitrate
800 µg/L 8%
of the EPA limit 10000 µg/L
 6/36 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 4/4 LCR 2022
Barium
84 µg/L 4.2%
of the EPA limit 2000 µg/L
 3/7 SYR4 2012–2019
Selenium
5.4 µg/L 11%
of the EPA limit 50 µg/L
 3/7 SYR4 2012–2019
Mercury
0.0200 µg/L 1%
of the EPA limit 2 µg/L
 1/7 SYR4 2012–2019
Nitrate-Nitrite
400000 µg/L 4000%
of the EPA limit, in the worst sample — 10000 µg/L
 1/5 SYR4 2012–2019
34 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalArsenicAtrazineBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylbenzeneLassoLeadNitriteSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
SCRIVNER, CHRISTOPHER
Phone
805-400-9416
Email
christopher@gomacmgt.com

Frequently asked questions about Bassi Ranch Mutual Water Co.

Is Bassi Ranch Mutual Water Co. tap water safe to drink?

EPA monitoring detected 8 contaminants in Bassi Ranch Mutual Water Co.'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 Bassi Ranch Mutual Water Co.'s water?

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

How many people does Bassi Ranch Mutual Water Co. serve?

Bassi Ranch Mutual Water Co. reports serving 85 people in California, per its EPA record.

Has Bassi Ranch Mutual Water Co. had any water quality violations?

The EPA has 12 violations on file for Bassi Ranch Mutual Water Co., of which 0 are health-based (a contaminant limit or required treatment was breached) and 1 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.