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Product Safety9,700+ CPSC product recalls Food Safety28,600+ FDA food recalls Pet Safety1.3M FDA animal adverse events Drug Safety17,500+ FDA drug recalls Device Safety38,400+ FDA device recalls Workplace Safety102,900+ OSHA injury reports Brand HistoryRecall lookup by company

Infrastructure

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KNIGHTSEN ELEMENTARY SCHOOL

California - Non-Transient Non-Community - PWSID: CA0706028

System Information

PWSIDCA0706028
System NameKNIGHTSEN ELEMENTARY SCHOOL
System TypeNon-Transient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolYes
WholesalerNo
First ReportedMar 22, 1979
Last ReportedJun 22, 2026

Location & Contact

StateCalifornia
CityKNIGHTSEN
ZIP Code94548
Address1923 Delta Rd
OrganizationCONTRERAS, ROBERT
Phone925-626-3308

Population & Service

Population Served350
Service Connections4

Drinking Water Violations (38)

This water system has 38 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
Oct 1, 2016 Dec 31, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Dec 31, 2016 -
Oct 1, 2016 Dec 31, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Dec 31, 2016 -
Jul 1, 2016 Sep 30, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Sep 30, 2016 -
Jul 1, 2016 Sep 30, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Sep 30, 2016 -
Apr 1, 2016 Jun 30, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Jun 30, 2016 -
Apr 1, 2016 Jun 30, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Jun 30, 2016 -
Jan 1, 2016 Mar 31, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Mar 31, 2016 -
Jan 1, 2016 Mar 31, 2016 MCL Yes No .012 MG/L 0.010 mg/L - Resolved Mar 31, 2016 -
Oct 1, 2015 Dec 31, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Dec 31, 2015 -
Oct 1, 2015 Dec 31, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Dec 31, 2015 -
Jul 1, 2015 Sep 30, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Sep 30, 2015 -
Jul 1, 2015 Sep 30, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Sep 30, 2015 -
Apr 1, 2015 Jun 30, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Jun 30, 2015 -
Apr 1, 2015 Jun 30, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Jun 30, 2015 -
Jan 1, 2015 Mar 31, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Mar 31, 2015 -
Jan 1, 2015 Mar 31, 2015 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Mar 31, 2015 -
Oct 1, 2014 Dec 31, 2014 MCL Yes No .0127 MG/L 0.010 mg/L - Resolved Dec 31, 2014 -
Oct 1, 2014 Dec 31, 2014 MCL Yes No .0127 MG/L 0.010 mg/L - Resolved Dec 31, 2014 -
Jul 1, 2014 Sep 30, 2014 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Sep 30, 2014 -
Jul 1, 2014 Sep 30, 2014 MCL Yes No .013 MG/L 0.010 mg/L - Resolved Sep 30, 2014 -
Apr 1, 2014 Jun 30, 2014 MCL Yes No .012 MG/L 0.010 mg/L .01 Resolved Jun 30, 2014 -
Apr 1, 2014 Jun 30, 2014 MCL Yes No .012 MG/L 0.010 mg/L .01 Resolved Jun 30, 2014 -
Jan 1, 2014 Mar 31, 2014 MCL Yes No .0132 MG/L 0.010 mg/L - Resolved Mar 31, 2014 -
Jan 1, 2014 Mar 31, 2014 MCL Yes No .0132 MG/L 0.010 mg/L - Resolved Mar 31, 2014 -
Jul 1, 2009 Sep 30, 2009 MCL Yes No .012 MG/L 0.010 mg/L .01 Resolved Sep 30, 2009 -
Jul 1, 2009 Sep 30, 2009 MCL Yes No .012 MG/L 0.010 mg/L .01 Resolved Sep 30, 2009 -
Jul 1, 2009 Sep 30, 2009 MCL Yes No .012 MG/L 0.010 mg/L .01 Resolved Sep 30, 2009 -
May 1, 1984 May 31, 1984 Other No No - - - Archived May 31, 1984 -
Feb 1, 1984 Feb 29, 1984 Other No No - - - Archived Feb 29, 1984 -
Jan 1, 1984 Jan 31, 1984 Other No No - - - Archived Jan 31, 1984 -
Nov 1, 1983 Nov 30, 1983 Other No No - - - Archived Nov 30, 1983 -
Oct 1, 1983 Oct 31, 1983 Other No No - - - Archived Oct 31, 1983 -
Aug 1, 1983 Aug 31, 1983 Other No No - - - Archived Aug 31, 1983 -
Apr 1, 1983 Apr 30, 1983 Other No No - - - Archived Apr 30, 1983 -
Mar 1, 1983 Mar 31, 1983 Other No No - - - Archived Mar 31, 1983 -
Feb 1, 1983 Feb 28, 1983 Other No No - - - Archived Feb 28, 1983 -
- - - No No - - - - - -
- - - 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.

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