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HARRISON SCHOOL DISTRICT NO 23

Montana — Non-Transient Non-Community — PWSID: MT0003790

System Information

PWSIDMT0003790
System NameHARRISON SCHOOL DISTRICT NO 23
System TypeNon-Transient Non-Community
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolYes
WholesalerNo
First ReportedApr 24, 1995
Last ReportedJan 5, 2026

Location & Contact

StateMontana
CityHARRISON
ZIP Code59735
AddressPO BOX 7
OrganizationSUPERINTENDENT, HARRISON SCHOOL DIST
Phone406-685-3428

Population & Service

Population Served100
Service Connections1

Drinking Water Violations (1,139)

This water system has 1,139 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
Aug 1, 2025 Aug 31, 2025 Revised Total Coliform Rule MON No Yes — — — Archived Aug 31, 2025 Revised Total Coliform Rule
Aug 1, 2025 Aug 31, 2025 Revised Total Coliform Rule MON No Yes — — — Archived Aug 31, 2025 Revised Total Coliform Rule
Dec 1, 2024 Dec 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2024 Revised Total Coliform Rule
Dec 1, 2024 Dec 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2024 Revised Total Coliform Rule
Dec 1, 2024 Dec 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2024 Revised Total Coliform Rule
Nov 1, 2024 Nov 30, 2024 Revised Total Coliform Rule MON No Yes — — — Archived Nov 30, 2024 Revised Total Coliform Rule
Nov 1, 2024 Nov 30, 2024 Revised Total Coliform Rule MON No Yes — — — Archived Nov 30, 2024 Revised Total Coliform Rule
Aug 1, 2024 Aug 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2024 Revised Total Coliform Rule
Aug 1, 2024 Aug 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2024 Revised Total Coliform Rule
Aug 1, 2024 Aug 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2024 Revised Total Coliform Rule
Aug 1, 2024 Aug 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2024 Revised Total Coliform Rule
Jul 1, 2024 Jul 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jul 31, 2024 Revised Total Coliform Rule
Jul 1, 2024 Jul 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jul 31, 2024 Revised Total Coliform Rule
Jul 1, 2024 Jul 31, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jul 31, 2024 Revised Total Coliform Rule
Jun 1, 2024 Jun 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2024 Revised Total Coliform Rule
Jun 1, 2024 Jun 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2024 Revised Total Coliform Rule
Jun 1, 2024 Jun 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Jun 30, 2024 Revised Total Coliform Rule
Apr 1, 2024 Apr 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2024 Revised Total Coliform Rule
Apr 1, 2024 Apr 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2024 Revised Total Coliform Rule
Apr 1, 2024 Apr 30, 2024 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2024 Revised Total Coliform Rule
Jan 1, 2024 Dec 31, 2024 Nitrate-Nitrite MR No Yes — — — Resolved Dec 31, 2024 Nitrate Rule
Jan 1, 2024 Dec 31, 2024 Nitrate-Nitrite MR No Yes — — — Resolved Dec 31, 2024 Nitrate Rule
Jan 1, 2024 Dec 31, 2024 Nitrate-Nitrite MR No Yes — — — Resolved Dec 31, 2024 Nitrate Rule
Aug 1, 2023 Aug 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2023 Revised Total Coliform Rule
Aug 1, 2023 Aug 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2023 Revised Total Coliform Rule
Aug 1, 2023 Aug 31, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Aug 31, 2023 Revised Total Coliform Rule
Jul 1, 2022 Sep 30, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 Sep 30, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 Sep 30, 2022 Chlorine MR No Yes — 4.0 mg/L — Resolved Sep 30, 2022 Stage 1 Disinfectants and Disinfection Byproducts Rule
Dec 1, 2021 Dec 31, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2021 Revised Total Coliform Rule
Dec 1, 2021 Dec 31, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2021 Revised Total Coliform Rule
Dec 1, 2021 Dec 31, 2021 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2021 Revised Total Coliform Rule
Jan 1, 2021 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Archived Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Archived Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Archived Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Archived Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2022 Volatile Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals
Jan 1, 2020 Dec 31, 2022 BHC-GAMMA MR No Yes — 0.0002 mg/L — Resolved Dec 31, 2022 Synthetic Organic Chemicals

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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