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Tap water quality report

Sierra Linda Mutual Water Co

EPA monitoring tested this supplier for 46 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

46
contaminants tested
9
detected
200
people served
119
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Madera

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.

119
health-based violations
123
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2026-01-01 → 2026-03-31
MCL Health-based Archived 2026-01-01 → 2026-03-31
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-01-01 → 2025-03-31
MCL Health-based Archived 2025-01-01 → 2025-03-31

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
30.6 µg/L 306%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 34 µg/L
37/37 SYR4 2012–2019
Combined Uranium
571.527 µg/L 1905%
of the EPA limit, at the 95th percentile of samples — 30 µg/L
worst single sample: 808.623 µg/L
32/32 SYR4 2012–2019
Nitrate
836.2 µg/L 8.4%
of the EPA limit 10000 µg/L
 12/56 SYR4 2012–2019
Barium
10.545 µg/L 0.5%
of the EPA limit 2000 µg/L
worst single sample: 12 µg/L
4/5 SYR4 2012–2018
Fluoride
526 µg/L 13%
of the EPA limit 4000 µg/L
worst single sample: 550 µg/L
4/5 SYR4 2012–2018
Lead
0.0031 mg/L 21%
of the EPA limit 0.0150 mg/L
 4/4 LCR 2025
Copper
28.3 µg/L 2.2%
of the EPA limit 1300 µg/L
worst single sample: 29 µg/L
2/5 SYR4 2012–2018
Cyanide
5.5 µg/L 2.8%
of the EPA limit 200 µg/L
 1/5 SYR4 2012–2018
Combined Radium (-226 And -228)
0.6100 pCi/L 12%
of the EPA limit 5 pCi/L
 1/2 SYR4 2017
37 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateEthylbenzeneLassoLeadMercuryNitriteSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
_NEWMAN, PATRICK
Phone
559-877-4701
Email
drdonwill@prodigy.net

Frequently asked questions about Sierra Linda Mutual Water Co

Is Sierra Linda Mutual Water Co tap water safe to drink?

EPA monitoring detected 9 contaminants in Sierra Linda 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 Sierra Linda Mutual Water Co's water?

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

How many people does Sierra Linda Mutual Water Co serve?

Sierra Linda Mutual Water Co reports serving 200 people in California, per its EPA record.

Has Sierra Linda Mutual Water Co had any water quality violations?

The EPA has 123 violations on file for Sierra Linda Mutual Water Co, of which 119 are health-based (a contaminant limit or required treatment was breached) and 2 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.