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Water system · PWSID MT0004107

WYE AREA WATER SYSTEM

MISSOULA, MT · ~512 people served

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

PWSID

MT0004107

State

Montana

City

MISSOULA

Population served

512

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

26

Violations on record

0

Unaddressed

6

Health-based

90

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Mar 2025. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Dec 2024 Resolved
Monitoring & reporting · EPA contaminant 3014 began Jun 2016 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2013 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 2012 Resolved
Monitoring & reporting · EPA contaminant 3014 began Sep 2012 Resolved
Monitoring & reporting · EPA contaminant 3014 began Sep 2012 Resolved
Monitoring & reporting · Total coliform began May 2012 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 2011 Resolved
Monitoring & reporting · EPA contaminant 3014 began Nov 2011 Resolved
Other · EPA contaminant 7000 began Oct 2011 Resolved
Max contaminant level (MCL) · Total coliform health-based began Oct 2010 Resolved
Monitoring & reporting · EPA contaminant 3014 began Oct 2010 Resolved

Recent enforcement actions

  • State action · SOX Mar 2025
  • State action · SIA Feb 2025
  • State action · SIA Jul 2016
  • State action · SIE Jul 2016
  • State action · SOX Jul 2016
  • State action · SOX Aug 2013
  • State action · SIF Aug 2013
  • State action · SIA Jul 2013

This profile is built from EPA public records for system MT0004107 — 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.