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Water system · PWSID MT0000234

HAMILTON CITY OF

HAMILTON, MT · ~5,585 people served

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

PWSID

MT0000234

State

Montana

City

HAMILTON

Population served

5,585

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 Aug 2023). Levels in parts per trillion (ppt).

PFBS

3.1 ppt

limit —

No federal limit

Violations & enforcement

10

Violations on record

0

Unaddressed

0

Health-based

17

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Oct 2020. Official EPA record →

Monitoring & reporting · Lead & Copper Rule began Dec 2017 Resolved
Monitoring & reporting · Thallium began Jan 2012 Resolved
Monitoring & reporting · Total coliform began Dec 2011 Resolved
Other · EPA contaminant 7000 began Jul 2006 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2001 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 2001 Resolved
Monitoring & reporting · Nitrate began Jan 1996 Resolved
Monitoring & reporting · Nitrate began Jan 1994 Resolved
Monitoring & reporting · Lead & Copper Rule began Jul 1993 Resolved
Monitoring & reporting · Nitrate began Jan 1993 Resolved

Recent enforcement actions

  • State action · SOX Oct 2020
  • State action · SIA Jan 2018
  • State action · SIA Jan 2013
  • State action · SIE Jan 2013
  • State action · SOX Mar 2012
  • State action · SOX Feb 2012
  • State action · SIA Jan 2012
  • State action · SIE Jan 2012

This profile is built from EPA public records for system MT0000234 — 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.