WESTBOROUGH WATER DISTRICT
California — Community Water System — PWSID: CA4110027
System Information
| PWSID | CA4110027 |
| System Name | WESTBOROUGH WATER DISTRICT |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | SOUTH SAN FRANCISCO |
| ZIP Code | 94080 |
| Address | 2263 Westborough Blvd. |
| Organization | MAIRENA, PATRICIA |
| Phone | 650-589-1435 |
Population & Service
| Population Served | 13,486 |
| Service Connections | 3,907 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 1998 | Jul 31, 1998 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 27, 1998 | Total Coliform Rule |
| Jul 1, 1998 | Jul 31, 1998 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 27, 1998 | Total Coliform Rule |
| Oct 1, 1991 | Jul 31, 1998 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jul 31, 1998 | Surface Water Treatment 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.