CITY OF MOUNTAIN HOUSE
California — Community Water System — PWSID: CA3910027
System Information
| PWSID | CA3910027 |
| System Name | CITY OF MOUNTAIN HOUSE |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Jun 24, 1999 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | MOUNTAIN HOUSE |
| ZIP Code | 95391 |
| Address | 251 E Main St. |
| Organization | MORGAN, KAREN |
| Phone | 209-831-5648 |
Population & Service
| Population Served | 24,948 |
| Service Connections | 7,559 |
Drinking Water Violations (3)
This water system has 3 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb 1, 2010 | Feb 28, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Feb 28, 2010 | Total Coliform Rule |
| Feb 1, 2010 | Feb 28, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Feb 28, 2010 | Total Coliform Rule |
| Jan 1, 2005 | Mar 31, 2005 | TTHM | MCL | Yes | No | .095 MG/L | 0.080 mg/L | .08 | Resolved | Mar 31, 2005 | Stage 1 Disinfectants and Disinfection Byproducts Rule |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.