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CITY OF DOS PALOS

California — Community Water System — PWSID: CA2410002

System Information

PWSIDCA2410002
System NameCITY OF DOS PALOS
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityDOS PALOS
ZIP Code93620
Address2174 Blossom Street
OrganizationJONES, DEWAYNE
Phone209-392-6201

Population & Service

Population Served7,452
Service Connections2,525

Drinking Water Violations (54)

This water system has 54 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 TTHM MCL Yes No .0892 MG/L 0.080 mg/L .08 Archived Sep 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2025 Jun 30, 2025 TTHM MCL Yes No .0878 MG/L 0.080 mg/L .08 Archived Jun 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2025 Mar 31, 2025 TTHM MCL Yes No .0931 MG/L 0.080 mg/L .08 Archived Mar 31, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2024 Dec 31, 2024 TTHM MCL Yes No .0984 MG/L 0.080 mg/L .08 Archived Dec 31, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2024 Jun 30, 2024 TTHM MCL Yes No .1036 MG/L 0.080 mg/L .08 Archived Jun 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2023 Jun 30, 2023 TTHM MCL Yes No .084 MG/L 0.080 mg/L .08 Archived Jun 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Mar 31, 2023 TTHM MCL Yes No .107 MG/L 0.080 mg/L .08 Archived Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 — Lead and Copper Rule MR No No — TT — Addressed — Lead and Copper Rule
Oct 1, 2022 Dec 31, 2022 TTHM MCL Yes No 104.5 UG/L 0.080 mg/L .08 Archived Dec 31, 2022 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2021 Sep 30, 2021 TTHM MCL Yes No 143 UG/L 0.080 mg/L 80 Archived Sep 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2021 Jun 30, 2021 TTHM MCL Yes No 120 UG/L 0.080 mg/L 80 Archived Jun 30, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Mar 31, 2021 TTHM MCL Yes No 108 UG/L 0.080 mg/L 80 Archived Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Mar 31, 2021 Total Haloacetic Acids (HAA5) MCL Yes No 98 UG/L 0.060 mg/L 60 Archived Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 Dec 31, 2020 TTHM MCL Yes No 106 UG/L 0.080 mg/L 80 Archived Dec 31, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2020 Dec 31, 2020 CARBON, TOTAL TT Yes No — TT — Archived Dec 31, 2020 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2020 Sep 30, 2020 TTHM MCL Yes No 93.4 UG/L 0.080 mg/L 80 Archived Sep 30, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2020 Sep 30, 2020 CARBON, TOTAL TT Yes No — TT — Archived Sep 30, 2020 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2020 Jun 30, 2020 TTHM MCL Yes No .091 MG/L 0.080 mg/L .08 Archived Jun 30, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2020 Jun 30, 2020 CARBON, TOTAL TT Yes No — TT — Archived Jun 30, 2020 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2019 Dec 31, 2019 TTHM MCL Yes No .11 MG/L 0.080 mg/L .08 Archived Dec 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2019 Jun 30, 2019 TTHM MCL Yes No .089 MG/L 0.080 mg/L .08 Archived Jun 30, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2019 Mar 31, 2019 TTHM MCL Yes No .105 MG/L 0.080 mg/L .08 Archived Mar 31, 2019 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2018 Dec 31, 2018 TTHM MCL Yes No .104 MG/L 0.080 mg/L .08 Archived Dec 31, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2018 Sep 30, 2018 TTHM MCL Yes No .094 MG/L 0.080 mg/L .08 Archived Sep 30, 2018 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2017 Jun 30, 2017 TTHM MCL Yes No 97 UG/L 0.080 mg/L 80 Archived Jun 30, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 TTHM MCL Yes No .122 MG/L 0.080 mg/L .08 Archived Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Jan 31, 2017 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2017 Surface Water Treatment Rule
Jan 1, 2017 Jan 31, 2017 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 2017 Surface Water Treatment Rule
Oct 1, 2016 Dec 31, 2016 TTHM MCL Yes No 125 UG/L 0.080 mg/L 80 Archived Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 TTHM MCL Yes No 132 UG/L 0.080 mg/L 80 Archived Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2016 Jun 30, 2016 TTHM MCL Yes No 150 UG/L 0.080 mg/L 80 Archived Jun 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2016 Mar 31, 2016 TTHM MCL Yes No 147 UG/L 0.080 mg/L 80 Archived Mar 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2015 Dec 31, 2015 TTHM MCL Yes No 145 UG/L 0.080 mg/L 80 Archived Dec 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2015 Sep 30, 2015 TTHM MCL Yes No 135 UG/L 0.080 mg/L 80 Archived Sep 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2015 Jun 30, 2015 TTHM MCL Yes No 140 MG/L 0.080 mg/L 80 Archived Jun 30, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2015 Mar 31, 2015 TTHM MCL Yes No 135 UG/L 0.080 mg/L 80 Archived Mar 31, 2015 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2014 Dec 31, 2014 TTHM MCL Yes No 135 UG/L 0.080 mg/L 80 Archived Dec 31, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2014 Sep 30, 2014 TTHM MCL Yes No .155 MG/L 0.080 mg/L .08 Archived Sep 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2014 Jun 30, 2014 TTHM MCL Yes No .125 MG/L 0.080 mg/L .08 Archived Jun 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2014 Jun 30, 2014 TTHM MCL Yes No .125 MG/L 0.080 mg/L .08 Archived Jun 30, 2014 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .0873 MG/L 0.080 mg/L .08 Archived Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2013 Sep 30, 2013 TTHM MCL Yes No .0873 MG/L 0.080 mg/L .08 Archived Sep 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .0858 MG/L 0.080 mg/L .08 Archived Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2013 Jun 30, 2013 TTHM MCL Yes No .0858 MG/L 0.080 mg/L .08 Archived Jun 30, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .0925 MG/L 0.080 mg/L .08 Archived Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2013 Mar 31, 2013 TTHM MCL Yes No .0925 MG/L 0.080 mg/L .08 Archived Mar 31, 2013 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2007 Dec 31, 2007 TTHM MCL Yes No .0828 MG/L 0.080 mg/L .08 Resolved Dec 31, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2007 Dec 31, 2007 TTHM MCL Yes No .0828 MG/L 0.080 mg/L .08 Resolved Dec 31, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2007 Sep 30, 2007 TTHM MCL Yes No .0833 MG/L 0.080 mg/L .08 Resolved Sep 30, 2007 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2007 Sep 30, 2007 TTHM MCL Yes No .0833 MG/L 0.080 mg/L .08 Resolved Sep 30, 2007 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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