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.
| Violation | Type | Status | Period |
|---|---|---|---|
| MR | Monitoring | Resolved | 1993-07-01 → 2003-12-31 |
| Other | Monitoring | Archived | 1984-04-01 → 1984-04-30 |
| MR | Monitoring | Archived | 1981-10-01 → 1982-09-30 |
| MR | Monitoring | Archived | 1980-10-30 → 1981-10-29 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 3800 µg/L 38% of the EPA limit 10000 µg/L | 42/44 | SYR4 | 2012–2019 |
| Fluoride | 320 µg/L 8% of the EPA limit 4000 µg/L | 5/5 | SYR4 | 2013–2019 |
| Selenium | 12 µg/L 24% of the EPA limit 50 µg/L | 5/5 | SYR4 | 2013–2019 |
| Lead | 0.0052 mg/L 35% of the EPA limit 0.0150 mg/L | 4/4 | LCR | 2024 |
| Arsenic | 3.8 µg/L 38% of the EPA limit 10 µg/L | 3/5 | SYR4 | 2013–2019 |
| Combined Uranium | 7.152 µg/L 24% of the EPA limit 30 µg/L | 2/2 | SYR4 | 2017–2018 |
| Nitrate-Nitrite | 3000 µg/L 30% of the EPA limit 10000 µg/L | 2/2 | SYR4 | 2017–2019 |
| Bromoform | 5.9 µg/L No EPA limit set | 1/1 | SYR4 | 2017 |
| Dibromoacetic Acid | 2 µg/L No EPA limit set | 1/1 | SYR4 | 2017 |
| Dibromochloromethane | 1 µg/L No EPA limit set | 1/1 | SYR4 | 2017 |
| TTHM | 6.9 µg/L 8.6% of the EPA limit 80 µg/L | 1/1 | SYR4 | 2017 |
| Total Haloacetic Acids (HAA5) | 2 µg/L 3.3% of the EPA limit 60 µg/L | 1/1 | SYR4 | 2017 |
68 contaminants tested, none detected
Utility contact
Frequently asked questions about Walnut Hills Mutual Water Co
Is Walnut Hills Mutual Water Co tap water safe to drink?
EPA monitoring detected 12 contaminants in Walnut Hills 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 Walnut Hills Mutual Water Co's water?
EPA monitoring detected Nitrate, Fluoride, Selenium, Lead, Arsenic, and others. The full list with the level and data source for each is above.
How many people does Walnut Hills Mutual Water Co serve?
Walnut Hills Mutual Water Co reports serving 486 people in California, per its EPA record.
Has Walnut Hills Mutual Water Co had any water quality violations?
The EPA has 4 violations on file for Walnut Hills Mutual Water Co, of which 0 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.