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Water system · PWSID MT0003136

WEST YELLOWSTONE TOWN OF

WEST YELLOWSTONE, MT · ~9,899 people served

Check your exact address → WEST YELLOWSTONE overview
100
Excellent
PurityRadar safety score

PWSID

MT0003136

State

Montana

City

WEST YELLOWSTONE

Population served

9,899

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

Latest detections from EPA’s UCMR5 monitoring (through Oct 2024). Levels in parts per trillion (ppt).

Lithium

15,000 ppt

limit —

No federal limit

Violations & enforcement

62

Violations on record

0

Unaddressed

2

Health-based

110

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Sep 2021. Official EPA record →

Monitoring & reporting · Arsenic began Apr 2021 Resolved
Monitoring & reporting · EPA contaminant 3014 began Aug 2019 Resolved
Monitoring & reporting · Lead & Copper Rule began Apr 2018 Resolved
Monitoring & reporting · Fluoride began Jan 2018 Resolved
Monitoring & reporting · Arsenic began Jan 2018 Resolved
Monitoring & reporting · Fluoride began Jan 2018 Resolved
Monitoring & reporting · EPA contaminant 3014 began Dec 2017 Resolved
Monitoring & reporting · EPA contaminant 2039 began Jul 2017 Resolved
Monitoring & reporting · EPA contaminant 2037 began Jul 2017 Resolved
Monitoring & reporting · EPA contaminant 2040 began Jul 2017 Resolved
Other · EPA contaminant 7000 began Jul 2017 Resolved
Monitoring & reporting · EPA contaminant 2031 began Jul 2017 Resolved

Recent enforcement actions

  • State action · SIE Sep 2021
  • State action · SIA Sep 2021
  • State action · SOX Jul 2021
  • State action · SIA Sep 2019
  • State action · SIE Sep 2019
  • State action · SOX Sep 2019
  • State action · SOX Jun 2018
  • State action · SOX May 2018

This profile is built from EPA public records for system MT0003136 — 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.