CHESTER TOWN OF

CHESTER, MT · ~870 people served

Check your exact address → CHESTER overview

100

Excellent

PurityRadar safety score

PWSID

MT0000173

State

Montana

City

CHESTER

Population served

870

Primary source

Surface water

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 Oct 2025. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Oct 2025 Unaddressed

Monitoring & reporting · Uranium began Jan 2017 Resolved

Monitoring & reporting · Gross alpha began Jan 2017 Resolved

Monitoring & reporting · EPA contaminant 2964 began Jul 2015 Resolved

Monitoring & reporting · EPA contaminant 2955 began Jul 2015 Resolved

Other · EPA contaminant 7000 began Jul 2010 Resolved

Monitoring & reporting · Total coliform began Jul 2003 Resolved

Treatment technique · EPA contaminant 0200 health-based began Dec 1993 Resolved

Recent enforcement actions

State action · SIA Oct 2025
State action · SIE Oct 2025
State action · SIF Jun 2023
State action · SOX Feb 2023
State action · SOX Feb 2023
State action · SIE Jan 2023
State action · SIA Jan 2023
State action · SIE Jan 2023

This profile is built from EPA public records for system MT0000173 — 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.