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Water system · PWSID MT0000294

MISSOULA WATER

MISSOULA, MT · ~68,200 people served

Check your exact address → MISSOULA overview
100
Excellent
PurityRadar safety score

PWSID

MT0000294

State

Montana

City

MISSOULA

Population served

68,200

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

Latest detections from EPA’s UCMR5 monitoring (through Apr 2025). Levels in parts per trillion (ppt).

Lithium

9,300 ppt

limit —

No federal limit

Violations & enforcement

28

Violations on record

0

Unaddressed

0

Health-based

17

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Aug 2017. Official EPA record →

Monitoring & reporting · EPA contaminant 2039 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2040 began Apr 2017 Resolved
Monitoring & reporting · Gross alpha began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2005 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2010 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2015 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2020 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2031 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2035 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2036 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2037 began Apr 2017 Resolved
Monitoring & reporting · EPA contaminant 2041 began Apr 2017 Resolved

Recent enforcement actions

  • State action · SOX Aug 2017
  • State action · SOX Aug 2017
  • State action · SOX Aug 2017
  • State action · SIE Jul 2017
  • State action · SIE Jul 2017
  • State action · SIA Jul 2017
  • State action · SIE Jul 2017
  • State action · SIA Jul 2017

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

1 station · latest Nov 2023

3.3 · max 12.4 ug/l · 66

Copper

1 station · latest Nov 2023

3.2 · max 58.5 ug/l · 66

Lead

1 station · latest Nov 2023

0.305 · max 12.2 ug/l · 66

Manganese

1 station · latest Nov 2023

15.3 · max 320 ug/l · 66

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 MT0000294 — 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.