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HOLLISTER, CITY OF

California — Community Water System — PWSID: CA3510001

System Information

PWSIDCA3510001
System NameHOLLISTER, CITY OF
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityHOLLISTER
ZIP Code95023
Address1321 South St.
OrganizationVIA, WILLIAM
Phone831-636-4370

Population & Service

Population Served26,017
Service Connections7,884

Drinking Water Violations (32)

This water system has 32 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
Apr 1, 2024 Jun 30, 2024 Total Haloacetic Acids (HAA5) MR No No — 0.060 mg/L — Archived Jun 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2024 Jun 30, 2024 TTHM MR No No — 0.080 mg/L — Archived Jun 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 Sep 30, 2022 TTHM MCL Yes No .086 MG/L 0.080 mg/L .08 Resolved Sep 30, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 TTHM MCL Yes No .083 MG/L 0.080 mg/L .08 Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 TTHM MCL Yes No .083 MG/L 0.080 mg/L .08 Resolved Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MCL Yes No .092 MG/L 0.080 mg/L .08 Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MCL Yes No .092 MG/L 0.080 mg/L .08 Resolved Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Mar 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MCL Yes No .082 MG/L 0.080 mg/L .08 Resolved Mar 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Dec 31, 2015 TTHM MCL Yes No .083 MG/L 0.080 mg/L .08 Resolved Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Dec 31, 2015 TTHM MCL Yes No .083 MG/L 0.080 mg/L .08 Resolved Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Oct 1, 2015 Oct 31, 2015 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2015 Total Coliform Rule
Apr 1, 2010 Jun 30, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Jun 30, 2010 Nitrate Rule
Apr 1, 2010 Jun 30, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Jun 30, 2010 Nitrate Rule
Jan 1, 2010 Mar 31, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Mar 31, 2010 Nitrate Rule
Jan 1, 2010 Mar 31, 2010 Nitrate MR No Yes — 10 mg/L — Resolved Mar 31, 2010 Nitrate Rule
Jan 1, 2002 Dec 31, 2004 Combined Uranium MR No No — 30 ug/L — Resolved Dec 31, 2004 Radionuclides and Revised Rad Rule
Jan 1, 2002 Dec 31, 2004 Combined Uranium MR No No — 30 ug/L — Resolved Dec 31, 2004 Radionuclides and Revised Rad Rule
Mar 1, 2000 Mar 31, 2000 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2000 Total Coliform Rule
Mar 1, 2000 Mar 31, 2000 Coliform (TCR) MR No No — 5% of samples — Resolved Mar 31, 2000 Total Coliform Rule
Jan 1, 1999 Jan 1, 2001 Benzene MR No Yes — 0.005 mg/L — Resolved Jan 1, 2001 Volatile Organic Chemicals
Jan 1, 1999 Jan 1, 2001 Nitrate MR No Yes — 10 mg/L — Resolved Jan 1, 2001 Nitrate Rule
Jan 1, 1999 Jan 1, 2001 Nitrate MR No Yes — 10 mg/L — Resolved Jan 1, 2001 Nitrate Rule
Jan 1, 1999 Jan 1, 2001 Benzene MR No Yes — 0.005 mg/L — Resolved Jan 1, 2001 Volatile Organic Chemicals
Jan 1, 1999 Mar 31, 1999 Nitrate MCL Yes No 48 MG/L 10 mg/L 45 Resolved Mar 31, 1999 Nitrate Rule
Jan 1, 1999 Mar 31, 1999 Nitrate MCL Yes No 48 MG/L 10 mg/L 45 Resolved Mar 31, 1999 Nitrate Rule
Jul 31, 1998 Sep 30, 1998 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 1998 Nitrate Rule
Jul 31, 1998 Sep 30, 1998 Nitrate MR No Yes — 10 mg/L — Resolved Sep 30, 1998 Nitrate Rule
Jul 31, 1997 Sep 30, 1997 Benzene MR No Yes — 0.005 mg/L — Resolved Sep 30, 1997 Volatile Organic Chemicals
Jul 31, 1997 Sep 30, 1997 Benzene MR No Yes — 0.005 mg/L — Resolved Sep 30, 1997 Volatile Organic Chemicals
Sep 1, 1987 Sep 30, 1987 Other No No — — — Archived Sep 30, 1987 Miscellaneous Other Rules

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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