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Tap water quality report

Sierra East Hoa

EPA monitoring tested this supplier for 4 contaminants and detected 4. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

4
contaminants tested
4
detected
84
people served
32
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Private
Counties served
Mono

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.

32
health-based violations
87
violations on file
3
still open
ViolationTypeStatusPeriod
TT Health-based Unaddressed 2024-10-17
MCL Health-based Archived 2021-04-01 → 2021-06-30
MCL Health-based Archived 2021-04-01 → 2021-06-30
MCL Health-based Archived 2021-01-01 → 2021-03-31
MCL Health-based Archived 2021-01-01 → 2021-03-31
MCL Health-based Archived 2020-10-01 → 2020-12-31
MCL Health-based Archived 2020-10-01 → 2020-12-31
MCL Health-based Archived 2020-07-01 → 2020-09-30
MCL Health-based Archived 2020-07-01 → 2020-09-30
MCL Health-based Archived 2020-04-01 → 2020-06-30

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
122.2 µg/L 1222%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 340 µg/L
44/44 SYR4 2012–2019
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
 6/6 LCR 2027
Nitrate
580 µg/L 5.8%
of the EPA limit 10000 µg/L
 6/10 SYR4 2012–2019
Combined Uranium
1.1324 µg/L 3.8%
of the EPA limit 30 µg/L
 1/1 SYR4 2016

Utility contact

Contact
MURRAY, ROSE
Phone
530-208-6408
Email
rose@walkerriver.com

Frequently asked questions about Sierra East Hoa

Is Sierra East Hoa tap water safe to drink?

EPA monitoring detected 4 contaminants in Sierra East Hoa'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 East Hoa's water?

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

How many people does Sierra East Hoa serve?

Sierra East Hoa reports serving 84 people in California, per its EPA record.

Has Sierra East Hoa had any water quality violations?

The EPA has 87 violations on file for Sierra East Hoa, of which 32 are health-based (a contaminant limit or required treatment was breached) and 3 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.