ATASCADERO MUTUAL WATER CO
California — Community Water System — PWSID: CA4010002
System Information
| PWSID | CA4010002 |
| System Name | ATASCADERO MUTUAL WATER CO |
| System Type | Community Water System |
| Water Source | Ground Water |
| 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 | ATASCADERO |
| ZIP Code | 93422 |
| Address | 5005 El Camino Real |
| Organization | POWERS, CHERYL |
| Phone | 805-400-5851 |
Population & Service
| Population Served | 30,618 |
| Service Connections | 10,961 |
Drinking Water Violations (2)
This water system has 2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jun 1, 1993 | Jun 30, 1993 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jan 12, 1993 | Surface Water Treatment Rule |
| Jun 1, 1993 | Jun 30, 1993 | Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jan 12, 1993 | 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.