GRANT CREEK WATER USERS ASSOCIATION INC

MISSOULA, MT · ~380 people served

Check your exact address → MISSOULA overview

100

Excellent

PurityRadar safety score

PWSID

MT0003305

State

Montana

City

MISSOULA

Population served

380

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

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2018. Official EPA record →

Other · EPA contaminant 7000 began Jul 2018 Resolved

Monitoring & reporting · EPA contaminant 0999 began Jan 2012 Resolved

Monitoring & reporting · Total coliform began Jul 2008 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2006 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2005 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 2002 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2002 Resolved

Monitoring & reporting · Lead & Copper Rule began Jul 2001 Resolved

Recent enforcement actions

State action · SOX Jul 2018
State action · SIA Jul 2018
State action · SOX Feb 2013
State action · SIF Apr 2012
State action · SIE Apr 2012
State action · SIA Apr 2012
State action · SOX May 2009
State action · SOX Jan 2009

This profile is built from EPA public records for system MT0003305 — 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.