CALIFORNIA WATER SERVICE CO. - DOMINGUEZ
California — Community Water System — PWSID: CA1910033
System Information
| PWSID | CA1910033 |
| System Name | CALIFORNIA WATER SERVICE CO. - DOMINGUEZ |
| System Type | Community Water System |
| Water Source | Surface Water Purchased |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | SAN JOSE |
| ZIP Code | 95112 |
| Address | 1720 NORTH FIRST STREET |
| Organization | HENRIE, TARRAH |
| Phone | 408-367-8490 |
Population & Service
| Population Served | 143,996 |
| Service Connections | 33,150 |
Drinking Water Violations (15)
This water system has 15 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, 2018 | Jun 30, 2018 | Total Haloacetic Acids (HAA5) | MR | No | No | — | 0.060 mg/L | — | Resolved | Jun 30, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Apr 1, 2018 | Jun 30, 2018 | Total Haloacetic Acids (HAA5) | MR | No | No | — | 0.060 mg/L | — | Resolved | Jun 30, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Apr 1, 2018 | Jun 30, 2018 | TTHM | MR | No | No | — | 0.080 mg/L | — | Resolved | Jun 30, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Apr 1, 2018 | Jun 30, 2018 | TTHM | MR | No | No | — | 0.080 mg/L | — | Resolved | Jun 30, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2018 | Mar 31, 2018 | TTHM | MR | No | No | — | 0.080 mg/L | — | Resolved | Mar 31, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2018 | Mar 31, 2018 | TTHM | MR | No | No | — | 0.080 mg/L | — | Resolved | Mar 31, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2018 | Mar 31, 2018 | Total Haloacetic Acids (HAA5) | MR | No | No | — | 0.060 mg/L | — | Resolved | Mar 31, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Jan 1, 2018 | Mar 31, 2018 | Total Haloacetic Acids (HAA5) | MR | No | No | — | 0.060 mg/L | — | Resolved | Mar 31, 2018 | Stage 2 Disinfectants and Disinfection Byproducts Rule |
| Nov 1, 2001 | Nov 30, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2001 | Total Coliform Rule |
| Nov 1, 2001 | Nov 30, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2001 | Total Coliform Rule |
| Oct 1, 1995 | Oct 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1995 | Total Coliform Rule |
| Oct 1, 1995 | Oct 31, 1995 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 1995 | Total Coliform Rule |
| Sep 1, 1993 | Sep 30, 1993 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Sep 30, 1993 | 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.