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ST. HELENA, CITY OF

California — Community Water System — PWSID: CA2810004

System Information

PWSIDCA2810004
System NameST. HELENA, CITY OF
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
CityST. HELENA
ZIP Code94574
Address1088 COLLEGE AVENUE
OrganizationLEACH, JOSEPH
Phone707-968-2629

Population & Service

Population Served5,386
Service Connections2,551

Drinking Water Violations (17)

This water system has 17 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, 2023 Sep 30, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 84.87 UG/L 0.060 mg/L 60 Archived Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2023 Jun 30, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 79.32 UG/L 0.060 mg/L 60 Archived Jun 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Mar 31, 2023 Total Haloacetic Acids (HAA5) MCL Yes No 81 UG/L 0.060 mg/L 60 Archived Mar 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2022 — Lead and Copper Rule MR No No — TT — Unaddressed — Lead and Copper Rule
Jan 1, 2021 Mar 31, 2021 Total Haloacetic Acids (HAA5) MCL Yes No .064 MG/L 0.060 mg/L .06 Archived Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Mar 31, 2021 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Archived Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Mar 31, 2021 Total Haloacetic Acids (HAA5) MCL Yes No 87.1 UG/L 0.060 mg/L 60 Archived Mar 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Nov 1, 2020 Nov 30, 2020 Surface Water Treatment Rule TT Yes No — — — Resolved Nov 30, 2020 Surface Water Treatment Rule
Nov 1, 2020 Nov 30, 2020 Surface Water Treatment Rule TT Yes No — — — Resolved Nov 30, 2020 Surface Water Treatment Rule
Oct 1, 2020 Dec 31, 2020 Total Haloacetic Acids (HAA5) MCL Yes No .065 MG/L 0.060 mg/L .06 Archived Dec 31, 2020 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2017 Mar 31, 2017 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Mar 31, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2016 Dec 31, 2016 Total Haloacetic Acids (HAA5) MCL Yes No .069 MG/L 0.060 mg/L .06 Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2016 Dec 31, 2016 Total Haloacetic Acids (HAA5) MCL Yes No .069 MG/L 0.060 mg/L .06 Resolved Dec 31, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2016 Sep 30, 2016 Total Haloacetic Acids (HAA5) MCL Yes No .061 MG/L 0.060 mg/L .06 Resolved Sep 30, 2016 Stage 2 Disinfectants and Disinfection Byproducts Rule
Feb 1, 1995 Feb 28, 1995 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Feb 27, 1995 Total Coliform Rule
Jun 1, 1993 Jun 30, 1993 Surface Water Treatment Rule TT Yes No — — — Resolved Mar 29, 1993 Surface Water Treatment 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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