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THOMPSON FALLS CITY OF

Montana — Community Water System — PWSID: MT0000341

System Information

PWSIDMT0000341
System NameTHOMPSON FALLS CITY OF
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region08
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1979
Last ReportedJan 5, 2026

Location & Contact

StateMontana
CityTHOMPSON FALLS
ZIP Code59813
AddressPO BOX 99
OrganizationHARNETT, JONATHAN O
Phone406-827-3557

Population & Service

Population Served1,950
Service Connections719

Drinking Water Violations (28)

This water system has 28 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, 2015 — Consumer Confidence Rule Other No No — — — Resolved Jul 17, 2015 Consumer Confidence Rule
Jul 1, 2015 — Consumer Confidence Rule Other No No — — — Resolved Jul 17, 2015 Consumer Confidence Rule
Nov 1, 2005 Nov 30, 2005 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2005 Total Coliform Rule
Nov 1, 2005 Nov 30, 2005 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2005 Total Coliform Rule
Nov 1, 2005 Nov 30, 2005 Coliform (TCR) MR No No — 5% of samples — Resolved Nov 30, 2005 Total Coliform Rule
Dec 1, 1999 Dec 31, 1999 Surface Water Treatment Rule TT Yes No — — — Resolved Dec 31, 1999 Surface Water Treatment Rule
Dec 1, 1999 Dec 31, 1999 Surface Water Treatment Rule TT Yes No — — — Resolved Dec 31, 1999 Surface Water Treatment Rule
Dec 1, 1999 Dec 31, 1999 Surface Water Treatment Rule TT Yes No — — — Resolved Dec 31, 1999 Surface Water Treatment Rule
Apr 1, 1997 Apr 30, 1997 Coliform (TCR) MR No No — 5% of samples — Resolved Apr 30, 1997 Total Coliform Rule
Jan 1, 1997 Jan 31, 1997 Coliform (TCR) MR No No — 5% of samples — Resolved Jan 31, 1997 Total Coliform Rule
Jan 1, 1996 Dec 31, 1996 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 1996 Nitrate Rule
Oct 1, 1994 Oct 31, 1994 Coliform (TCR) MR No No — 5% of samples — Resolved Oct 31, 1994 Total Coliform Rule
Jun 1, 1994 Jun 30, 1994 Coliform (TCR) MR No No — 5% of samples — Resolved Jun 30, 1994 Total Coliform Rule
Jan 1, 1994 Dec 31, 1994 Fluoride MR No Yes — 4.0 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Cadmium MR No Yes — 0.005 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 Arsenic MR No Yes — 0.010 mg/L — Resolved Dec 31, 1994 Arsenic Rule
Jan 1, 1994 Dec 31, 1994 Beryllium, Total MR No Yes — 0.004 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 CYANIDE MR No Yes — 0.2 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Nitrate MR No Yes — 10 mg/L — Resolved Dec 31, 1994 Nitrate Rule
Jan 1, 1994 Dec 31, 1994 Antimony, Total MR No Yes — 0.006 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Barium MR No Yes — 2 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Chromium MR No Yes — 0.1 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Mercury MR No Yes — 0.002 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Selenium MR No Yes — 0.05 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jan 1, 1994 Dec 31, 1994 Thallium, Total MR No Yes — 0.002 mg/L — Resolved Dec 31, 1994 Inorganic Chemicals
Jul 1, 1992 Jul 31, 1992 Coliform (TCR) MR No No — 5% of samples — Resolved Jul 31, 1992 Total Coliform Rule
— — — No No — — — — — —

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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