NPS-DEVILS POSTPILE
California — Transient Non-Community — PWSID: CA2010501
System Information
| PWSID | CA2010501 |
| System Name | NPS-DEVILS POSTPILE |
| System Type | Transient Non-Community |
| 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 | MAMMOTH LAKES |
| ZIP Code | 93546 |
| Address | 2500 North Main Street, P.O. Box 3999 |
| Organization | WONG, REBECCA |
| Phone | 760-923-8220 |
Population & Service
| Population Served | 1,220 |
| Service Connections | 12 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2012 | Dec 31, 2012 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2012 | — | |
| Jan 1, 2012 | Dec 31, 2012 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2012 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jan 1, 2008 | Dec 31, 2008 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2008 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jul 1, 2006 | Jul 31, 2006 | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2006 | — | |
| Jan 1, 2000 | Dec 31, 2000 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2000 | — | |
| Jan 1, 2000 | Dec 31, 2000 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 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.