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Water system · PWSID MT0000377

HAPPY VALLEY MHP

MISSOULA, MT · ~55 people served

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

PWSID

MT0000377

State

Montana

City

MISSOULA

Population served

55

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

18

Violations on record

0

Unaddressed

0

Health-based

43

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Dec 2024 Resolved
Other · EPA contaminant 7000 began Jul 2017 Resolved
Other · EPA contaminant 7000 began Jul 2015 Resolved
Other · EPA contaminant 7000 began Oct 2013 Resolved
Other · EPA contaminant 7000 began Jul 2013 Resolved
Monitoring & reporting · Lead & Copper Rule began Jan 2013 Resolved
Other · EPA contaminant 7000 began Jul 2008 Resolved
Monitoring & reporting · Total coliform began Oct 2002 Resolved
Monitoring & reporting · Total coliform began Nov 2001 Resolved
Monitoring & reporting · Total coliform began Oct 2001 Resolved
Monitoring & reporting · Nitrate began Jan 1999 Resolved
Monitoring & reporting · Total coliform began Oct 1997 Resolved

Recent enforcement actions

  • State action · SOX Nov 2025
  • State action · SOX Apr 2025
  • State action · SIA Feb 2025
  • State action · SIE Jan 2025
  • State action · SIA Jan 2025
  • State action · SOX Aug 2017
  • State action · SIA Jul 2017
  • State action · SOX Jul 2015

This profile is built from EPA public records for system MT0000377 — 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.