CIRCLE OAKS WATER DISTRICT
PWS ID: CA2800521 · NAPA, California 94558
Population Served
500
Total Violations
7
Health-Based Violations
0
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 190
- County
- Napa
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 7
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 2 | 2006 |
| Nitrate | MR | 2 | 2020 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Lead and Copper Rule | MR | 1 | 1993 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.