TOWN OF HILLSBOROUGH
California — Community Water System — PWSID: CA4110016
System Information
| PWSID | CA4110016 |
| System Name | TOWN OF HILLSBOROUGH |
| 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 | HILLSBOROUGH |
| ZIP Code | 94010 |
| Address | 1600 FLORIBUNDA AVENUE |
| Organization | WILLIS, PAUL |
| Phone | 650-375-7487 |
Population & Service
| Population Served | 11,766 |
| Service Connections | 4,303 |
Drinking Water Violations (4)
This water system has 4 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| May 1, 2014 | May 31, 2014 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | May 31, 2014 | Total Coliform Rule |
| May 1, 2014 | May 31, 2014 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | May 31, 2014 | Total Coliform Rule |
| Jun 1, 1992 | Jul 31, 1992 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 1992 | Total Coliform Rule |
| Jun 1, 1992 | Jul 31, 1992 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jul 31, 1992 | Total Coliform 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.