MCMAHON ROAD MUTUAL WATER COMPANY
PWS ID: CA3500510 · HOLLISTER, California 95023
Population Served
102
Total Violations
37
Health-Based Violations
16
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 32
- County
- San Benito
- School/Daycare
- No
- MCL Violations
- 16
- Monitoring Violations
- 17
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 14 | 2000 |
| Chlorine | MR | 5 | 2005 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2006 |
| TTHM | MR | 3 | 2006 |
| Coliform (TCR) | MR | 2 | 2005 |
| Arsenic | MCL | 2 | 1982 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1981 |
| Consumer Confidence Rule | Other | 2 | 2006 |
| Lead and Copper Rule | MR | 1 | 1993 |
| Arsenic | MR | 1 | 1980 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.