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Water system · PWSID MT0000150

BIG SANDY TOWN OF

BIG SANDY, MT · ~608 people served

Check your exact address → BIG SANDY overview
100
Excellent
PurityRadar safety score

PWSID

MT0000150

State

Montana

City

BIG SANDY

Population served

608

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

27

Violations on record

0

Unaddressed

2

Health-based

41

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2024 Resolved
Monitoring & reporting · Thallium began Jan 2024 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Sep 2017 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Sep 2017 Resolved
Monitoring & reporting · Thallium began Jan 2017 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Sep 2014 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Sep 2014 Resolved
Monitoring & reporting · EPA contaminant 0999 began Jul 2014 Resolved
Monitoring & reporting · Total coliform began Sep 2011 Resolved
Monitoring & reporting · Total coliform began Apr 2010 Resolved
Monitoring & reporting · Thallium began Jan 2008 Resolved
Other · EPA contaminant 7000 began Jul 2006 Resolved

Recent enforcement actions

  • State action · SOX Jan 2025
  • State action · SIE Jan 2025
  • State action · SIA Jan 2025
  • State action · SOX Jul 2024
  • State action · SIA Jul 2024
  • State action · SOX Aug 2019
  • State action · SIE Oct 2018
  • State action · SIA Oct 2018

This profile is built from EPA public records for system MT0000150 — 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.