CONTRA COSTA WATER DISTRICT
California — Community Water System — PWSID: CA0710003
System Information
| PWSID | CA0710003 |
| System Name | CONTRA COSTA 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 | CONCORD |
| ZIP Code | 94520-4907 |
| Address | 1131 CONCORD AVE |
| Organization | HOBBS, MATTHEW |
| Phone | 925-688-8192 |
Population & Service
| Population Served | 198,000 |
| Service Connections | 60,730 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb 1, 1999 | Feb 28, 1999 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Feb 28, 1999 | Surface Water Treatment Rule |
| Feb 1, 1999 | Feb 28, 1999 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Feb 28, 1999 | Surface Water Treatment Rule |
| Feb 1, 1999 | Feb 28, 1999 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Feb 28, 1999 | Surface Water Treatment Rule |
| Oct 1, 1989 | Oct 31, 1989 | Other | No | No | — | — | — | Archived | Oct 31, 1989 | Miscellaneous Other Rules |
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.