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COLSTRIP CITY OF

Montana — Community Water System — PWSID: MT0000180

System Information

PWSIDMT0000180
System NameCOLSTRIP CITY OF
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1979
Last ReportedJan 5, 2026

Location & Contact

StateMontana
CityCOLSTRIP
ZIP Code59323
AddressPO BOX 1902
OrganizationZENT, PAT
Phone406-720-0153

Population & Service

Population Served2,350
Service Connections913

Drinking Water Violations (130)

This water system has 130 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, 2024 Jul 31, 2024 Surface Water Treatment Rule TT Yes No — — — Resolved Jul 31, 2024 Surface Water Treatment Rule
Jul 1, 2024 Jul 31, 2024 Surface Water Treatment Rule TT Yes No — — — Resolved Jul 31, 2024 Surface Water Treatment Rule
Jul 1, 2024 Jul 31, 2024 Surface Water Treatment Rule TT Yes No — — — Resolved Jul 31, 2024 Surface Water Treatment Rule
Jul 1, 2024 Jul 31, 2024 Surface Water Treatment Rule TT Yes No — — — Resolved Jul 31, 2024 Surface Water Treatment Rule
Jul 1, 2024 Sep 30, 2024 TTHM MCL Yes No 81 UG/L 0.080 mg/L 80 Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 TTHM MCL Yes No 81 UG/L 0.080 mg/L 80 Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2024 Sep 30, 2024 TTHM MCL Yes No 81 UG/L 0.080 mg/L 80 Resolved Sep 30, 2024 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No No — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No No — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No No — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jan 1, 2024 Jan 31, 2024 Surface Water Treatment Rule MR No Yes — — — Resolved Jan 31, 2024 Surface Water Treatment Rule
Jul 1, 2023 Sep 30, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Sep 30, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Sep 30, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Sep 30, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Sep 30, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2023 Sep 30, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Sep 30, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
May 1, 2022 May 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved May 31, 2022 Revised Total Coliform Rule
May 1, 2022 May 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved May 31, 2022 Revised Total Coliform Rule
May 1, 2022 May 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved May 31, 2022 Revised Total Coliform Rule
Jan 1, 2011 Dec 31, 2013 Asbestos MR No Yes — 7 MFL — Resolved Oct 30, 2013 Inorganic Chemicals
Jan 1, 2011 Dec 31, 2013 Asbestos MR No Yes — 7 MFL — Resolved Oct 30, 2013 Inorganic Chemicals
Jan 1, 2011 Dec 31, 2013 Asbestos MR No Yes — 7 MFL — Resolved Oct 30, 2013 Inorganic Chemicals
Aug 1, 2008 Aug 31, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2008 Total Coliform Rule
Aug 1, 2008 Aug 31, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2008 Total Coliform Rule
Aug 1, 2008 Aug 31, 2008 Coliform (TCR) MR No No — 5% of samples — Resolved Aug 31, 2008 Total Coliform Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Sep 1, 2007 Sep 30, 2007 Coliform (TCR) MR No No — 5% of samples — Resolved Sep 30, 2007 Total Coliform Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004 Sep 30, 2004 CARBON, TOTAL MR No Yes — TT — Resolved Sep 30, 2004 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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