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 |
|---|---|---|---|
| TT | Health-based | Addressed | 2025-11-18 |
| MCL | Health-based | Resolved | 2020-01-01 → 2020-03-31 |
| MCL | Health-based | Resolved | 2020-01-01 → 2020-03-31 |
| MCL | Health-based | Resolved | 2020-01-01 → 2020-03-31 |
| MCL | Health-based | Resolved | 2019-10-01 → 2019-12-31 |
| MCL | Health-based | Resolved | 2019-10-01 → 2019-12-31 |
| MCL | Health-based | Resolved | 2019-10-01 → 2019-12-31 |
| MCL | Health-based | Resolved | 2019-07-01 → 2019-09-30 |
| MCL | Health-based | Resolved | 2019-07-01 → 2019-09-30 |
| MCL | Health-based | Resolved | 2019-07-01 → 2019-09-30 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 27000 µg/L 270% of the EPA limit, in the worst sample — 10000 µg/L | 82/82 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2024 |
| Nitrate-Nitrite | 26000 µg/L 260% of the EPA limit, in the worst sample — 10000 µg/L | 3/3 | SYR4 | 2018–2019 |
| Arsenic | 0.9400 µg/L 9.4% of the EPA limit 10 µg/L | 1/3 | SYR4 | 2018–2019 |
| Barium | 63 µg/L 3.2% of the EPA limit 2000 µg/L | 1/1 | SYR4 | 2019 |
| Chromium | 11 µg/L 11% of the EPA limit 100 µg/L | 1/1 | SYR4 | 2019 |
| Fluoride | 190 µg/L 4.8% of the EPA limit 4000 µg/L | 1/1 | SYR4 | 2019 |
| Lead | 0.5300 µg/L 3.5% of the EPA limit 15 µg/L | 1/1 | SYR4 | 2019 |
44 contaminants tested, none detected
Utility contact
Frequently asked questions about San Miguel Ws #01
Is San Miguel Ws #01 tap water safe to drink?
EPA monitoring detected 8 contaminants in San Miguel Ws #01'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 San Miguel Ws #01's water?
EPA monitoring detected Nitrate, Lead, Nitrate-Nitrite, Arsenic, Barium, and others. The full list with the level and data source for each is above.
How many people does San Miguel Ws #01 serve?
San Miguel Ws #01 reports serving 100 people in California, per its EPA record.
Has San Miguel Ws #01 had any water quality violations?
The EPA has 181 violations on file for San Miguel Ws #01, of which 151 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.