DELTA MUTUAL WATER COMPANY
PWS ID: CA0707573 · OAKLEY, California 94561
Population Served
333
Total Violations
24
Health-Based Violations
19
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 119
- County
- Contra Costa
- School/Daycare
- No
- MCL Violations
- 19
- Monitoring Violations
- 4
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 17 | 2024 |
| Coliform (TCR) | MCL | 2 | 2004 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Nitrate | MR | 2 | 2017 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.