YOSEMITE NPS-TUOLUMNE MEADOWS
California — Transient Non-Community — PWSID: CA5510500
System Information
| PWSID | CA5510500 |
| System Name | YOSEMITE NPS-TUOLUMNE MEADOWS |
| System Type | Transient Non-Community |
| 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 | Nov 17, 2025 |
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 | 2,500 |
| Service Connections | 6 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| May 1, 2009 | May 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2009 | Total Coliform Rule |
| May 1, 2009 | May 31, 2009 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | May 31, 2009 | Total Coliform Rule |
| Jul 1, 2006 | Jul 31, 2006 | Interim Enhanced Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jul 31, 2006 | Interim and Long Term 1 Enhanced Surface Water Treatment Rule |
| Jul 1, 2005 | Jul 31, 2005 | Interim Enhanced Surface Water Treatment Rule | TT | Yes | No | — | — | — | Resolved | Jul 31, 2005 | Interim and Long Term 1 Enhanced 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.