MOUNT DIABLO STATE PARK
PWS ID: CA0710300 · CLAYTON, California 94517-1500
Population Served
364
Total Violations
24
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- State
- Connections
- 8
- County
- Contra Costa
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 20
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 18 | 2015 |
| Coliform (TCR) | MCL | 4 | 1993 |
| Coliform (TCR) | MR | 2 | 1993 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.