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Tap water quality report

Yosemite Forks Est Mutual

EPA monitoring tested this supplier for 53 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

53
contaminants tested
5
detected
110
people served
59
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.

59
health-based violations
68
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 2026-01-01 → 2026-03-31
MCL Health-based Archived 2025-10-01 → 2025-12-31
MCL Health-based Archived 2025-07-01 → 2025-09-30
MCL Health-based Archived 2025-04-01 → 2025-06-30
MCL Health-based Archived 2025-01-01 → 2025-03-31
MCL Health-based Archived 2024-10-01 → 2024-12-31
MCL Health-based Archived 2024-07-01 → 2024-09-30
MCL Health-based Archived 2024-04-01 → 2024-06-30
MCL Health-based Archived 2024-01-01 → 2024-03-31
MCL Health-based Archived 2023-10-01 → 2023-12-31

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
20 µg/L 200%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 28 µg/L
37/45 SYR4 2012–2019
Fluoride
1700 µg/L 43%
of the EPA limit 4000 µg/L
 12/12 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 3/3 LCR 2024
Nitrate
678 µg/L 6.8%
of the EPA limit 10000 µg/L
 2/64 SYR4 2012–2019
Styrene
0.8100 µg/L 0.8%
of the EPA limit 100 µg/L
 1/12 SYR4 2012–2019
48 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalAsbestosAtrazineBariumBenzeneBeryllium, TotalBromodichloromethaneBromoformChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChloroformChromiumDichloromethaneDibromoacetic AcidDibromochloromethaneDichloroacetic AcidEthylbenzeneLassoLeadMercuryMonobromoacetic AcidMonochloroacetic AcidNitrate-NitriteNitriteSeleniumSimazineTTHMTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Trichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HUSTON, HOLLY
Phone
559-683-1170
Email
Holly.houston@verizon.net

Frequently asked questions about Yosemite Forks Est Mutual

Is Yosemite Forks Est Mutual tap water safe to drink?

EPA monitoring detected 5 contaminants in Yosemite Forks Est Mutual'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 Yosemite Forks Est Mutual's water?

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

How many people does Yosemite Forks Est Mutual serve?

Yosemite Forks Est Mutual reports serving 110 people in California, per its EPA record.

Has Yosemite Forks Est Mutual had any water quality violations?

The EPA has 68 violations on file for Yosemite Forks Est Mutual, of which 59 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.