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HOWELL MOUNTAIN MUTUAL WATER COMPANY

California — Community Water System — PWSID: CA2810001

System Information

PWSIDCA2810001
System NameHOWELL MOUNTAIN MUTUAL WATER COMPANY
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypePrivate
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityANGWIN
ZIP Code94508
AddressPO Box 9
OrganizationHIERS, TANNER
Phone707-965-2205

Population & Service

Population Served1,240
Service Connections379

Drinking Water Violations (87)

This water system has 87 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, 2023 Mar 31, 2023 TTHM MCL Yes No 82 UG/L 0.080 mg/L 80 Resolved Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Mar 31, 2023 TTHM MCL Yes No 82 UG/L 0.080 mg/L 80 Resolved Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2021 Jun 30, 2021 TTHM MCL Yes No .083 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 .083 MG/L 0.080 mg/L .08 Resolved Jun 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 — Lead and Copper Rule MR No No — TT — Resolved Sep 30, 2021 Lead and Copper Rule
Oct 1, 2020 — Lead and Copper Rule MR No No — TT — Resolved Sep 30, 2021 Lead and Copper Rule
Oct 1, 2016 Dec 31, 2016 TTHM MCL Yes No .0865 MG/L 0.080 mg/L .08 Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2016 Dec 31, 2016 TTHM MCL Yes No .0865 MG/L 0.080 mg/L .08 Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 TTHM MCL Yes No 81.75 UG/L 0.080 mg/L 80 Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 TTHM MCL Yes No 81.75 UG/L 0.080 mg/L 80 Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2015 Dec 31, 2015 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2015 Nitrate Rule
Jan 1, 2015 Dec 31, 2015 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 2015 Nitrate Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .089 MG/L 0.080 mg/L .08 Resolved Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .0616 MG/L 0.060 mg/L .06 Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .0616 MG/L 0.060 mg/L .06 Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .0693 MG/L 0.060 mg/L .06 Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 TTHM MCL Yes No .0907 MG/L 0.080 mg/L .08 Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 TTHM MCL Yes No .0907 MG/L 0.080 mg/L .08 Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2011 Mar 31, 2011 Total Haloacetic Acids (HAA5) MCL Yes No .0693 MG/L 0.060 mg/L .06 Resolved Mar 31, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .0731 MG/L 0.060 mg/L .06 Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .0731 MG/L 0.060 mg/L .06 Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 TTHM MCL Yes No .0994 MG/L 0.080 mg/L .08 Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2010 Dec 31, 2010 TTHM MCL Yes No .0994 MG/L 0.080 mg/L .08 Resolved Dec 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2010 Sep 30, 2010 TTHM MCL Yes No .1044 MG/L 0.080 mg/L .08 Resolved Sep 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2010 Sep 30, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .0755 MG/L 0.060 mg/L .06 Resolved Sep 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2010 Sep 30, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .0755 MG/L 0.060 mg/L .06 Resolved Sep 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2010 Sep 30, 2010 TTHM MCL Yes No .1044 MG/L 0.080 mg/L .08 Resolved Sep 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2010 Jun 30, 2010 TTHM MCL Yes No .099 MG/L 0.080 mg/L .08 Resolved Jun 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2010 Jun 30, 2010 TTHM MCL Yes No .099 MG/L 0.080 mg/L .08 Resolved Jun 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2010 Jun 30, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .065 MG/L 0.060 mg/L .06 Resolved Jun 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2010 Jun 30, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .065 MG/L 0.060 mg/L .06 Resolved Jun 30, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .0816 MG/L 0.060 mg/L .06 Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 Total Haloacetic Acids (HAA5) MCL Yes No .0816 MG/L 0.060 mg/L .06 Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2010 Mar 31, 2010 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Resolved Mar 31, 2010 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2009 Dec 31, 2009 TTHM MCL Yes No .093 MG/L 0.080 mg/L .08 Resolved Dec 31, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2009 Dec 31, 2009 TTHM MCL Yes No .093 MG/L 0.080 mg/L .08 Resolved Dec 31, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2009 Dec 31, 2009 Total Haloacetic Acids (HAA5) MCL Yes No .0706 MG/L 0.060 mg/L .06 Resolved Dec 31, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2009 Dec 31, 2009 Total Haloacetic Acids (HAA5) MCL Yes No .0706 MG/L 0.060 mg/L .06 Resolved Dec 31, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 TTHM MCL Yes No .0897 MG/L 0.080 mg/L .08 Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 Total Haloacetic Acids (HAA5) MR No No — 0.060 mg/L — Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 Total Haloacetic Acids (HAA5) MR No No — 0.060 mg/L — Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 TTHM MCL Yes No .0897 MG/L 0.080 mg/L .08 Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 Total Haloacetic Acids (HAA5) MCL Yes No .0639 MG/L 0.060 mg/L .06 Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 Total Haloacetic Acids (HAA5) MCL Yes No .0639 MG/L 0.060 mg/L .06 Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 TTHM MR No No — 0.080 mg/L — Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2009 Sep 30, 2009 TTHM MR No No — 0.080 mg/L — Resolved Sep 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2009 Jun 30, 2009 Total Haloacetic Acids (HAA5) MCL Yes No .0639 MG/L 0.060 mg/L .06 Resolved Jun 30, 2009 Stage 1 Disinfectants and Disinfection Byproducts 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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