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 | Unaddressed | 2024-10-17 |
| TT | Health-based | Resolved | 2022-12-01 |
| TT | Health-based | Resolved | 2022-12-01 |
| MR | Monitoring | Addressed | 2026-01-01 |
| MR | Monitoring | Addressed | 2026-01-01 |
| MR | Monitoring | Addressed | 2026-01-01 |
| MR | Monitoring | Addressed | 2025-07-01 |
| MR | Monitoring | Addressed | 2025-07-01 |
| MR | Monitoring | Addressed | 2025-07-01 |
| MR | Monitoring | Addressed | 2025-07-01 |
Other contaminants detected
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Lead | 0.0044 mg/L 29% of the EPA limit 0.0150 mg/L | 12/12 | LCR | 2024 |
| Nitrate | 1333.4 µg/L 13% of the EPA limit 10000 µg/L | 6/6 | SYR4 | 2015–2019 |
| Arsenic | 6.6 µg/L 66% of the EPA limit 10 µg/L | 2/2 | SYR4 | 2015–2019 |
| Barium | 4900 µg/L 245% of the EPA limit, in the worst sample — 2000 µg/L | 2/2 | SYR4 | 2015–2019 |
| Bromodichloromethane | 0.7300 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| Bromoform | 2.5 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| Chloroform | 0.7000 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| Dibromoacetic Acid | 12.6 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| Dibromochloromethane | 1 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| Dichloroacetic Acid | 1.48 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| Fluoride | 170 µg/L 4.3% of the EPA limit 4000 µg/L | 1/2 | SYR4 | 2015–2019 |
| Monobromoacetic Acid | 2.34 µg/L No EPA limit set | 1/1 | SYR4 | 2012 |
| TTHM | 4.9 µg/L 6.1% of the EPA limit 80 µg/L | 1/1 | SYR4 | 2012 |
| Thallium, Total | 1 µg/L 50% of the EPA limit 2 µg/L | 1/2 | SYR4 | 2015–2019 |
| Total Haloacetic Acids (HAA5) | 16.4 µg/L 27% of the EPA limit 60 µg/L | 1/1 | SYR4 | 2012 |
52 contaminants tested, none detected
Utility contact
Frequently asked questions about Napa River Ranch
Is Napa River Ranch tap water safe to drink?
EPA monitoring detected 15 contaminants in Napa River Ranch'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 Napa River Ranch's water?
EPA monitoring detected Lead, Nitrate, Arsenic, Barium, Bromodichloromethane, and others. The full list with the level and data source for each is above.
How many people does Napa River Ranch serve?
Napa River Ranch reports serving 70 people in California, per its EPA record.
Has Napa River Ranch had any water quality violations?
The EPA has 69 violations on file for Napa River Ranch, of which 3 are health-based (a contaminant limit or required treatment was breached) and 20 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.