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Water system · PWSID MT0000355

WESTBY TOWN OF

WESTBY, MT · ~172 people served

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

PWSID

MT0000355

State

Montana

City

WESTBY

Population served

172

Primary source

SWP

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

180

Violations on record

0

Unaddressed

11

Health-based

125

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Apr 2022. Official EPA record →

Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2022 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2022 Resolved
Monitoring & reporting · Arsenic began Jul 2019 Resolved
Monitoring & reporting · Arsenic began Oct 2018 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2015 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jan 2015 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Oct 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Jul 2014 Resolved
Max contaminant level (MCL) · Arsenic health-based began Apr 2014 Resolved
Monitoring & reporting · EPA contaminant 3014 began Nov 2013 Resolved
Monitoring & reporting · Arsenic began Apr 2013 Resolved

Recent enforcement actions

  • State action · SOX Apr 2022
  • State action · SIA Apr 2022
  • State action · SIE Apr 2022
  • State action · SO+ Mar 2020
  • State action · SOX Nov 2019
  • State action · SIA Oct 2019
  • State action · SIE Oct 2019
  • State action · SOX Feb 2019

This profile is built from EPA public records for system MT0000355 — 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.