ALAMEDA COUNTY WATER DISTRICT
California — Community Water System — PWSID: CA0110001
System Information
| PWSID | CA0110001 |
| System Name | ALAMEDA COUNTY WATER DISTRICT |
| 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 | Mar 22, 1979 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | FREMONT |
| ZIP Code | 94538-6348 |
| Address | 43885 S. GRIMMER BLVD |
| Organization | STEVENSON, ED |
| Phone | 510-668-4200 |
Population & Service
| Population Served | 344,000 |
| Service Connections | 86,959 |
Drinking Water Violations (9)
This water system has 9 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Apr 1, 1996 | Apr 30, 1996 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Apr 30, 1996 | Total Coliform Rule |
| Apr 1, 1996 | Apr 30, 1996 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Apr 30, 1996 | Total Coliform Rule |
| Jun 1, 1993 | Jun 30, 1993 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jun 30, 1993 | Surface Water Treatment Rule |
| Jun 1, 1993 | Jun 30, 1993 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jun 30, 1993 | Surface Water Treatment Rule |
| Sep 1, 1992 | Sep 30, 1992 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1992 | Total Coliform Rule |
| Sep 1, 1992 | Sep 30, 1992 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1992 | Total Coliform Rule |
| Sep 1, 1992 | Sep 30, 1992 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1992 | Total Coliform Rule |
| — | — | — | No | No | — | — | — | — | — | — | |
| — | — | — | No | No | — | — | — | — | — | — |
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.