UNION HEIGHTS MWC
PWS ID: CA3500825 · HOLLISTER, California 95024
Population Served
98
Total Violations
28
Health-Based Violations
8
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 29
- County
- San Benito
- School/Daycare
- No
- MCL Violations
- 8
- Monitoring Violations
- 15
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 7 | 2007 |
| Nitrate | MCL | 4 | 1999 |
| Coliform (TCR) | MCL | 4 | 2003 |
| TTHM | MR | 2 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2006 |
| Consumer Confidence Rule | Other | 2 | 2006 |
| Nitrate | MR | 2 | 2009 |
| Nitrite | MR | 2 | 2009 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.