TERWILLIGER ASSOCIATION
PWS ID: CA3301146 · ANZA, California 92539
Population Served
2,401
Total Violations
13
Health-Based Violations
5
Water Source
Groundwater
System Details
- System Type
- Transient Non-Community
- Owner Type
- Private
- Connections
- 2
- County
- Riverside
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 4
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 5 | 2016 |
| Nitrite | MR | 2 | 2014 |
| Revised Total Coliform Rule | MON | 2 | 2021 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.