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CHINOOK CITY OF

Montana — Community Water System — PWSID: MT0000174

System Information

PWSIDMT0000174
System NameCHINOOK 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
CityCHINOOK
ZIP Code59532
AddressPO BOX 1177
OrganizationDUNKIN, RHIANNON
Phone406-357-3160

Population & Service

Population Served1,300
Service Connections807

Drinking Water Violations (48)

This water system has 48 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
Oct 1, 2025 Dec 31, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .073 MG/L 0.060 mg/L .06 Unaddressed — Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2025 Dec 31, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .073 MG/L 0.060 mg/L .06 Unaddressed — Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2025 Sep 30, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .077 MG/L 0.060 mg/L .06 Archived Sep 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2025 Sep 30, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .077 MG/L 0.060 mg/L .06 Archived Sep 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2025 Jun 30, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .079 MG/L 0.060 mg/L .06 Archived Jun 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2025 Jun 30, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .079 MG/L 0.060 mg/L .06 Archived Jun 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2025 Jun 30, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .079 MG/L 0.060 mg/L .06 Archived Jun 30, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2025 Mar 31, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .071 MG/L 0.060 mg/L .06 Archived Mar 31, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2025 Mar 31, 2025 Total Haloacetic Acids (HAA5) MCL Yes No .071 MG/L 0.060 mg/L .06 Archived Mar 31, 2025 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2014 Oct 31, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2014 Total Coliform Rule
Oct 1, 2014 Oct 31, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2014 Total Coliform Rule
Oct 1, 2014 Oct 31, 2014 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 2014 Total Coliform Rule
Apr 1, 2011 Jun 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No 62.3 UG/L 0.060 mg/L 60 Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No 62.3 UG/L 0.060 mg/L 60 Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No 62.3 UG/L 0.060 mg/L 60 Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2011 Jun 30, 2011 Total Haloacetic Acids (HAA5) MCL Yes No 62.3 UG/L 0.060 mg/L 60 Resolved Jun 30, 2011 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2004 Dec 31, 2004 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2004 Dec 31, 2004 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2004 Dec 31, 2004 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2004 Inorganic Chemicals
Jan 1, 2003 Dec 31, 2003 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2003 Inorganic Chemicals
Jan 1, 2003 Dec 31, 2003 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2003 Inorganic Chemicals
Jan 1, 2003 Dec 31, 2003 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 2003 Inorganic Chemicals
Jan 1, 2002 Dec 31, 2002 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2002 Arsenic Rule
Jan 1, 2002 Dec 31, 2002 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2002 Arsenic Rule
Jan 1, 2002 Dec 31, 2002 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 2002 Arsenic Rule
Jan 1, 2000 Dec 31, 2000 DICHLOROMETHANE MCL Yes No .01 MG/L 0.005 mg/L .005 Resolved Dec 31, 2000 Volatile Organic Chemicals
Jan 1, 1999 Jan 31, 1999 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 1999 Surface Water Treatment Rule
Jan 1, 1999 Jan 31, 1999 Surface Water Treatment Rule TT Yes No — — — Resolved Jan 31, 1999 Surface Water Treatment Rule
Nov 1, 1997 Nov 30, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Nov 30, 1997 Surface Water Treatment Rule
Nov 1, 1997 Nov 30, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Nov 30, 1997 Surface Water Treatment Rule
Oct 1, 1997 Oct 31, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 1997 Surface Water Treatment Rule
Oct 1, 1997 Oct 31, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Oct 31, 1997 Surface Water Treatment Rule
Sep 1, 1997 Sep 30, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Sep 30, 1997 Surface Water Treatment Rule
Sep 1, 1997 Sep 30, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Sep 30, 1997 Surface Water Treatment Rule
Aug 1, 1997 Aug 31, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Aug 31, 1997 Surface Water Treatment Rule
Aug 1, 1997 Aug 31, 1997 Surface Water Treatment Rule TT Yes No — — — Resolved Aug 31, 1997 Surface Water Treatment Rule
Jun 1, 1995 Jun 30, 1995 Surface Water Treatment Rule TT Yes No — — — Resolved Jun 30, 1995 Surface Water Treatment Rule
May 1, 1995 May 31, 1995 Surface Water Treatment Rule TT Yes No — — — Resolved May 31, 1995 Surface Water Treatment Rule
Apr 1, 1995 Apr 30, 1995 Surface Water Treatment Rule TT Yes No — — — Resolved Apr 30, 1995 Surface Water Treatment Rule
Feb 1, 1995 Feb 28, 1995 Surface Water Treatment Rule TT Yes No — — — Resolved Feb 28, 1995 Surface Water Treatment Rule
May 1, 1994 May 31, 1994 Coliform (TCR) MR No No — 5% of samples — Resolved May 31, 1994 Total Coliform Rule
Jan 1, 1994 Jan 31, 1994 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 1994 Total Coliform Rule
Jan 1, 1994 Dec 31, 1994 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Nickel MR No Yes — — — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Antimony, Total MR No Yes — 0.006 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Jan 31, 1994 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 1994 Total Coliform Rule
Jan 1, 1993 Dec 31, 1993 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 1993 Volatile Organic Chemicals
Jan 1, 1993 Dec 31, 1993 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 1993 Nitrate 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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