BIG BASIN WATER COMPANY
PWS ID: CA4410001 · IRVINE, California 92606
Population Served
1,120
Total Violations
102
Health-Based Violations
52
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 540
- County
- Santa Cruz
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 47
- Treatment Tech Violations
- 52
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | TT | 52 | 2005 |
| TTHM | MR | 12 | 2022 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2022 |
| Coliform (TCR) | MR | 5 | 2004 |
| Nitrate | MR | 4 | 2018 |
| Revised Total Coliform Rule | MON | 4 | 2022 |
| Chlorine | MR | 2 | 2005 |
| Simazine | MR | 2 | 2018 |
| Arsenic | MR | 2 | 2018 |
| Nitrite | MR | 2 | 2018 |
| Lead and Copper Rule | MR | 2 | 1993 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.