YOSEMITE NPS-YOSEMITE VALLEY
California — Community Water System — PWSID: CA2210503
System Information
| PWSID | CA2210503 |
| System Name | YOSEMITE NPS-YOSEMITE VALLEY |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Federal |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | YOSEMITE NP |
| ZIP Code | 95389 |
| Address | P.O. BOX 577 |
| Organization | TRUMM, MICHAEL |
| Phone | 209-379-1055 |
Population & Service
| Population Served | 1,000 |
| Service Connections | 235 |
Drinking Water Violations (8)
This water system has 8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jul 1, 2025 | — | Other | No | No | — | — | — | Addressed | — | — | |
| Jul 1, 2007 | — | Other | No | No | — | — | — | Resolved | Nov 9, 2007 | — | |
| Jul 1, 2007 | — | Other | No | No | — | — | — | Resolved | Nov 9, 2007 | — | |
| Jan 1, 2007 | — | MR | No | No | — | TT | — | Resolved | Jan 2, 2007 | — | |
| Jan 1, 2007 | — | MR | No | No | — | TT | — | Resolved | Jan 2, 2007 | — | |
| Jul 1, 2005 | — | Other | No | No | — | — | — | Resolved | Nov 14, 2006 | — | |
| Jul 1, 2005 | — | Other | No | No | — | — | — | Resolved | Nov 14, 2006 | — | |
| Jun 30, 1993 | Mar 1, 2000 | MR | No | No | — | TT | — | Resolved | Mar 1, 2000 | — |
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.