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NPS-DEVILS POSTPILE

California — Transient Non-Community — PWSID: CA2010501

System Information

PWSIDCA2010501
System NameNPS-DEVILS POSTPILE
System TypeTransient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeFederal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityMAMMOTH LAKES
ZIP Code93546
Address2500 North Main Street, P.O. Box 3999
OrganizationWONG, REBECCA
Phone760-923-8220

Population & Service

Population Served1,220
Service Connections12

Drinking Water Violations (7)

This water system has 7 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 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2012 Nitrate Rule
Jan 1, 2012 Dec 31, 2012 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2012 Nitrate Rule
Jan 1, 2008 Dec 31, 2008 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2008 Nitrate Rule
Jan 1, 2008 Dec 31, 2008 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2008 Nitrate Rule
Jul 1, 2006 Jul 31, 2006 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2006 Total Coliform Rule
Jul 1, 2006 Jul 31, 2006 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2006 Total Coliform Rule
Jan 1, 2000 Dec 31, 2000 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2000 Nitrate 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.

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