THOMPSON FALLS CITY OF

THOMPSON FALLS, MT · ~1,950 people served

Check your exact address → THOMPSON FALLS overview

100

Excellent

PurityRadar safety score

PWSID

MT0000341

State

Montana

City

THOMPSON FALLS

Population served

1,950

Primary source

Groundwater

Score history

No change since tracking began Jun 18, 2026.

Jun 18, 2026 · score 100 Jun 18, 2026 · score 100

2 score updates logged since tracking began Jun 18, 2026. Each future EPA re-score adds a point.

PFAS & contaminant readings

No PFAS detections are on record for this system from EPA’s UCMR5 monitoring (2023–25). Absence of a detection isn’t a guarantee — not every system was sampled, and this dataset doesn’t cover other contaminants.

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2015. Official EPA record →

Other · EPA contaminant 7000 began Jul 2015 Resolved

Monitoring & reporting · Total coliform began Nov 2005 Resolved

Treatment technique · EPA contaminant 0200 health-based began Dec 1999 Resolved

Monitoring & reporting · Total coliform began Apr 1997 Resolved

Monitoring & reporting · Total coliform began Jan 1997 Resolved

Monitoring & reporting · Nitrate began Jan 1996 Resolved

Monitoring & reporting · Total coliform began Oct 1994 Resolved

Monitoring & reporting · Total coliform began Jun 1994 Resolved

Monitoring & reporting · Selenium began Jan 1994 Resolved

Monitoring & reporting · Chromium (total) began Jan 1994 Resolved

Monitoring & reporting · Cadmium began Jan 1994 Resolved

Monitoring & reporting · Nitrate began Jan 1994 Resolved

Recent enforcement actions

State action · SOX Jul 2015
State action · SIA Jul 2015
State action · SOX Aug 2009
State action · SOX May 2009
State action · SOX May 2009
State action · SOX May 2009
State action · SOX May 2009
State action · SOX May 2009

This profile is built from EPA public records for system MT0000341 — SDWIS violations and UCMR5 PFAS sampling. The score is system-level and can’t account for your home’s plumbing (older pipes can add lead at the tap). For health decisions, check your exact address, read the utility’s Consumer Confidence Report, and confirm with your provider.