YOSEMITE NPS-WAWONA
California - Community Water System - PWSID: CA2210510
System Information
| PWSID | CA2210510 |
| System Name | YOSEMITE NPS-WAWONA |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Federal |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Jun 22, 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 | 150 |
| Service Connections | 141 |
Drinking Water Violations (19)
This water system has 19 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 | - | - | - | Resolved | Jan 5, 2026 | - | |
| Jul 1, 2025 | - | Other | No | No | - | - | - | Resolved | Jan 5, 2026 | - | |
| Jul 1, 2007 | - | Other | No | No | - | - | - | Resolved | Nov 9, 2007 | - | |
| Jul 1, 2007 | - | Other | No | No | - | - | - | Resolved | Nov 9, 2007 | - | |
| Jul 1, 2005 | - | Other | No | No | - | - | - | Resolved | Nov 14, 2006 | - | |
| Jul 1, 2005 | - | Other | No | No | - | - | - | Resolved | Nov 14, 2006 | - | |
| May 1, 2000 | May 31, 2000 | TT | Yes | No | - | - | - | Resolved | May 31, 2000 | - | |
| May 1, 1996 | May 31, 1996 | TT | Yes | No | - | - | - | Resolved | May 31, 1996 | - | |
| May 1, 1996 | May 31, 1996 | TT | Yes | No | - | - | - | Resolved | May 31, 1996 | - | |
| May 1, 1996 | May 31, 1996 | TT | Yes | No | - | - | - | Resolved | May 31, 1996 | - | |
| Mar 1, 1995 | Mar 31, 1995 | TT | Yes | No | - | - | - | Resolved | Mar 31, 1995 | - | |
| Mar 1, 1995 | Mar 31, 1995 | TT | Yes | No | - | - | - | Resolved | Mar 31, 1995 | - | |
| Mar 1, 1995 | Mar 31, 1995 | TT | Yes | No | - | - | - | Resolved | Mar 31, 1995 | - | |
| Jan 1, 1995 | Jan 31, 1995 | TT | Yes | No | - | - | - | Resolved | Jan 31, 1995 | - | |
| Jan 1, 1995 | Jan 31, 1995 | TT | Yes | No | - | - | - | Resolved | Jan 31, 1995 | - | |
| Jan 1, 1995 | Jan 31, 1995 | TT | Yes | No | - | - | - | Resolved | Jan 31, 1995 | - | |
| Apr 1, 1993 | Apr 30, 1993 | MCL | Yes | No | - | 5% of samples | - | Resolved | Apr 30, 1993 | - | |
| Apr 1, 1993 | Apr 30, 1993 | MCL | Yes | No | - | 5% of samples | - | Resolved | Apr 30, 1993 | - | |
| - | - | - | 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.