TWIN VALLEY INC
PWS ID: CA4300575 · CASTROVILLE, California 95012
Population Served
317
Total Violations
129
Health-Based Violations
80
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 96
- County
- Santa Clara
- School/Daycare
- No
- MCL Violations
- 80
- Monitoring Violations
- 34
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MCL | 72 | 2023 |
| Coliform (TCR) | MCL | 8 | 2015 |
| Coliform (TCR) | MR | 8 | 2015 |
| Lead and Copper Rule | MR | 5 | 2007 |
| Revised Total Coliform Rule | MON | 5 | 2018 |
| Groundwater Rule | MR | 4 | 2015 |
| Asbestos | MR | 2 | 1993 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Nitrate | MR | 2 | 2016 |
| TTHM | MR | 2 | 2009 |
| E. COLI | MR | 2 | 2012 |
| Chlorine | MR | 2 | 2011 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.