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HANFORD, CITY OF

California — Community Water System — PWSID: CA1610003

System Information

PWSIDCA1610003
System NameHANFORD, CITY OF
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityHANFORD
ZIP Code93230
Address900 S. 10TH AVENUE
OrganizationSENTENO, FRANK
Phone559-585-2567

Population & Service

Population Served62,127
Service Connections19,077

Drinking Water Violations (447)

This water system has 447 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, 2023 — Lead and Copper Rule MR No No — TT — Resolved Aug 8, 2024 Lead and Copper Rule
Oct 1, 2023 — Lead and Copper Rule MR No No — TT — Resolved Aug 8, 2024 Lead and Copper Rule
Apr 1, 2021 Jun 30, 2021 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Jun 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2021 Jun 30, 2021 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Jun 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Mar 31, 2021 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Mar 31, 2021 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 Dec 31, 2020 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Dec 31, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 Dec 31, 2020 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Dec 31, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2020 Sep 30, 2020 TTHM MCL Yes No .085 MG/L 0.080 mg/L .08 Resolved Sep 30, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2020 Sep 30, 2020 TTHM MCL Yes No .085 MG/L 0.080 mg/L .08 Resolved Sep 30, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2014 Oct 31, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2014 Total Coliform Rule
Oct 1, 2014 Oct 31, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2014 Total Coliform Rule
Sep 1, 2014 Sep 30, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2014 Total Coliform Rule
Sep 1, 2014 Sep 30, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Sep 30, 2014 Total Coliform Rule
Aug 1, 2014 Aug 31, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 2014 Total Coliform Rule
Aug 1, 2014 Aug 31, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Aug 31, 2014 Total Coliform Rule
Jul 1, 2014 Jul 31, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2014 Total Coliform Rule
Jul 1, 2014 Jul 31, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 2014 Total Coliform Rule
Jun 1, 2014 Jun 30, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2014 Total Coliform Rule
Jun 1, 2014 Jun 30, 2014 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jun 30, 2014 Total Coliform Rule
Jan 1, 2014 Dec 31, 2014 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2014 Nitrate Rule
Jan 1, 2014 Dec 31, 2014 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2014 Nitrate Rule
Jan 1, 2014 Dec 31, 2014 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2014 Nitrate Rule
Dec 1, 2012 Dec 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 2012 Total Coliform Rule
Dec 1, 2012 Dec 31, 2012 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Dec 31, 2012 Total Coliform Rule
Oct 1, 2009 Oct 31, 2009 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2009 Total Coliform Rule
Oct 1, 2009 Oct 31, 2009 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Oct 31, 2009 Total Coliform Rule
Jul 1, 2009 Sep 30, 2009 Arsenic MCL Yes No .0469 MG/L 0.010 mg/L .01 Resolved Sep 30, 2009 Arsenic Rule
Jul 1, 2009 Sep 30, 2009 Arsenic MCL Yes No .0469 MG/L 0.010 mg/L .01 Resolved Sep 30, 2009 Arsenic Rule
Jul 1, 2009 Sep 30, 2009 Arsenic MCL Yes No .0469 MG/L 0.010 mg/L .01 Resolved Sep 30, 2009 Arsenic Rule
Apr 1, 2009 Jun 30, 2009 Arsenic MCL Yes No .0543 MG/L 0.010 mg/L .01 Resolved Jun 30, 2009 Arsenic Rule
Apr 1, 2009 Jun 30, 2009 Arsenic MCL Yes No .0543 MG/L 0.010 mg/L .01 Resolved Jun 30, 2009 Arsenic Rule
Jan 1, 2009 Mar 31, 2009 Arsenic MCL Yes No .0529 MG/L 0.010 mg/L .01 Resolved Mar 31, 2009 Arsenic Rule
Jan 1, 2009 Mar 31, 2009 Arsenic MCL Yes No .0529 MG/L 0.010 mg/L .01 Resolved Mar 31, 2009 Arsenic Rule
Jan 1, 2009 Mar 31, 2009 Arsenic MCL Yes No .0529 MG/L 0.010 mg/L .01 Resolved Mar 31, 2009 Arsenic Rule
Oct 1, 2008 Dec 31, 2008 Arsenic MCL Yes No .052 MG/L 0.010 mg/L .01 Resolved Dec 31, 2008 Arsenic Rule
Oct 1, 2008 Dec 31, 2008 Arsenic MCL Yes No .052 MG/L 0.010 mg/L .01 Resolved Dec 31, 2008 Arsenic Rule
Oct 1, 2008 Dec 31, 2008 Arsenic MCL Yes No .052 MG/L 0.010 mg/L .01 Resolved Dec 31, 2008 Arsenic Rule
Jul 1, 2008 Sep 30, 2008 Arsenic MCL Yes No .052 MG/L 0.010 mg/L .01 Resolved Sep 30, 2008 Arsenic Rule
Jul 1, 2008 Sep 30, 2008 Arsenic MCL Yes No .052 MG/L 0.010 mg/L .01 Resolved Sep 30, 2008 Arsenic Rule
Jul 1, 2008 Sep 30, 2008 Arsenic MCL Yes No .052 MG/L 0.010 mg/L .01 Resolved Sep 30, 2008 Arsenic Rule
Apr 1, 2008 Jun 30, 2008 Arsenic MCL Yes No .05375 MG/L 0.010 mg/L .01 Resolved Jun 30, 2008 Arsenic Rule
Apr 1, 2008 Jun 30, 2008 Arsenic MCL Yes No .05375 MG/L 0.010 mg/L .01 Resolved Jun 30, 2008 Arsenic Rule
Apr 1, 2008 Jun 30, 2008 Arsenic MCL Yes No .05375 MG/L 0.010 mg/L .01 Resolved Jun 30, 2008 Arsenic Rule
Jan 1, 2008 Mar 31, 2008 Arsenic MCL Yes No .055 MG/L 0.010 mg/L .01 Resolved Mar 31, 2008 Arsenic Rule
Jan 1, 2008 Mar 31, 2008 Arsenic MCL Yes No .055 MG/L 0.010 mg/L .01 Resolved Mar 31, 2008 Arsenic Rule
Oct 1, 2007 Dec 31, 2007 Arsenic MCL Yes No .0607 MG/L 0.010 mg/L .01 Resolved Dec 31, 2007 Arsenic Rule
Oct 1, 2007 Dec 31, 2007 Arsenic MCL Yes No .0607 MG/L 0.010 mg/L .01 Resolved Dec 31, 2007 Arsenic Rule
Oct 1, 2007 Dec 31, 2007 Arsenic MCL Yes No .0607 MG/L 0.010 mg/L .01 Resolved Dec 31, 2007 Arsenic Rule
Jul 1, 2007 Sep 30, 2007 Arsenic MCL Yes No .0673 MG/L 0.010 mg/L .01 Resolved Sep 30, 2007 Arsenic 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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