COLSTRIP CITY OF

COLSTRIP, MT · ~2,350 people served

Check your exact address → COLSTRIP overview

100

Excellent

PurityRadar safety score

PWSID

MT0000180

State

Montana

City

COLSTRIP

Population served

2,350

Primary source

Surface water

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 Dec 2024. Official EPA record →

Max contaminant level (MCL) · Total trihalomethanes (TTHM) health-based began Jul 2024 Resolved

Treatment technique · EPA contaminant 0200 health-based began Jul 2024 Resolved

Monitoring & reporting · EPA contaminant 0200 began Jan 2024 Resolved

Monitoring & reporting · Haloacetic acids (HAA5) began Jul 2023 Resolved

Monitoring & reporting · Total trihalomethanes (TTHM) began Jul 2023 Resolved

Monitoring · Lead & Copper Rule began May 2022 Resolved

Monitoring & reporting · EPA contaminant 1094 began Jan 2011 Resolved

Monitoring & reporting · Total coliform began Aug 2008 Resolved

Monitoring & reporting · Total coliform began Sep 2007 Resolved

Monitoring & reporting · Bromate began Jul 2004 Resolved

Recent enforcement actions

State action · SIA Dec 2024
State action · SIE Dec 2024
State action · SOX Dec 2024
State action · SIF Aug 2024
State action · SIA Aug 2024
State action · SOX Aug 2024
State action · SIE Aug 2024
State action · SOX Mar 2024

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Manganese

179 stations · latest Oct 2022

0.55 · max 16.9 mg/L · 814

Fluoride

29 stations · latest Oct 2022

0.3 · max 3.6 mg/L · 117

Arsenic

21 stations · latest Oct 2022

0.002 · max 0.01 mg/L · 69

Lead

14 stations · latest Aug 2022

0.003 · max 0.011 mg/L · 25

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system MT0000180 — 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.