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La Posta Upper

California - Community Water System - PWSID: 090605146

System Information

PWSID090605146
System NameLa Posta Upper
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeNative American
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 30, 2002
Last ReportedMar 25, 2026

Location & Contact

StateCalifornia
CityBoulevard
ZIP Code91905
Address8 Crestwood Road
OrganizationLa Posta Band of Mission Indians
Phone6194782113

Population & Service

Population Served73
Service Connections15

Drinking Water Violations (126)

This water system has 126 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 Sep 30, 2025 MR No Yes - 5 pCi/L - Archived Sep 30, 2025 -
Jul 1, 2025 Sep 30, 2025 MR No Yes - 30 ug/L - Archived Sep 30, 2025 -
Jul 1, 2025 Sep 30, 2025 MR No Yes - 15 pCi/L - Archived Sep 30, 2025 -
Aug 1, 2024 Aug 31, 2024 MON No Yes - - - Resolved Aug 31, 2024 -
Jul 1, 2024 Sep 30, 2024 MR No Yes - 4.0 mg/L - Resolved Sep 10, 2024 -
Jan 1, 2023 Mar 31, 2023 MCL Yes No 11.5 MG/L 10 mg/L - Resolved Mar 31, 2023 -
Jul 1, 2021 Sep 30, 2021 MCL Yes No 11 MG/L 10 mg/L - Resolved Sep 30, 2021 -
Apr 1, 2021 Jun 30, 2021 MR No Yes - 10 mg/L - Resolved Jun 30, 2021 -
Jan 1, 2021 Mar 31, 2021 MCL Yes No 11 MG/L 10 mg/L - Resolved Mar 31, 2021 -
Apr 1, 2020 Jun 30, 2020 MCL Yes No 11 MG/L 10 mg/L - Resolved Jun 30, 2020 -
Jul 1, 2016 - MR No No - TT - Resolved Feb 23, 2017 -
Jan 1, 2009 Mar 31, 2009 MR No No - 5% of samples - Resolved Mar 31, 2009 -
Sep 1, 2005 Sep 30, 2005 MR No No - 5% of samples - Resolved Sep 30, 2005 -
Aug 1, 2005 Aug 31, 2005 MCL Yes No - 5% of samples - Resolved Aug 31, 2005 -
Jul 1, 2005 Jul 31, 2005 MR No No - 5% of samples - Resolved Jul 31, 2005 -
Jun 1, 2005 Jun 30, 2005 MR No No - 5% of samples - Resolved Jun 30, 2005 -
Aug 1, 2004 Aug 31, 2004 MR No No - 5% of samples - Resolved Aug 31, 2004 -
Jul 1, 2004 Jul 31, 2004 MR No No - 5% of samples - Resolved Jul 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.0004 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - - - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.1 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.002 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.003 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.004 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.005 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.006 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.6 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.005 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.0002 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.05 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.04 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.0002 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.07 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.007 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.1 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.1 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.05 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.005 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.00005 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.0002 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.001 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.001 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.07 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.002 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.010 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 2 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.005 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.2 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 4.0 mg/L - Resolved Dec 31, 2004 -
Jan 1, 2004 Dec 31, 2004 MR No Yes - 0.004 mg/L - Resolved Dec 31, 2004 -

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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