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Water system · PWSID MT0000525

GREAT FALLS CITY OF

GREAT FALLS, MT · ~60,000 people served

Check your exact address → GREAT FALLS overview
100
Excellent
PurityRadar safety score

PWSID

MT0000525

State

Montana

City

GREAT FALLS

Population served

60,000

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

Latest detections from EPA’s UCMR5 monitoring (through Dec 2023). Levels in parts per trillion (ppt).

Lithium

61,800 ppt

limit —

No federal limit

Violations & enforcement

8

Violations on record

0

Unaddressed

6

Health-based

22

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2019. Official EPA record →

Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2019 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jan 2019 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Oct 2018 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Jul 2018 Resolved
Max contaminant level (MCL) · Haloacetic acids (HAA5) health-based began Apr 2018 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Oct 2006 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Oct 2006 Resolved
Treatment technique · EPA contaminant 0200 health-based began Aug 1997 Resolved

Recent enforcement actions

  • State action · SOX Aug 2019
  • State action · SOX Aug 2019
  • State action · SOX Aug 2019
  • State action · SOX Aug 2019
  • State action · SOX Aug 2019
  • State action · SIE Jun 2019
  • State action · SIA Jun 2019
  • State action · SIE Mar 2019

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

Arsenic

4 stations · latest Dec 2025

0.019 · max 0.03 mg/L · 182

Copper

4 stations · latest Dec 2025

0.002 · max 0.011 mg/L · 167

Lead

4 stations · latest Aug 2024

0.0004 · max 0.006 mg/L · 86

Nitrate

1 station · latest Dec 2025

4.09 · max 8.65 mg/L · 66

Fluoride

2 stations · latest Oct 2023

0.9 · max 1.05 mg/L · 40

Manganese

1 station · latest Aug 2024

0.0125 · max 0.087 mg/L · 36

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 MT0000525 — 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.