Home/ Directory/ MT/ DUNCAN RANCH COLONY

Water system · PWSID MT0000418

DUNCAN RANCH COLONY

HARLOWTON, MT · ~96 people served

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

PWSID

MT0000418

State

Montana

City

HARLOWTON

Population served

96

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

81

Violations on record

0

Unaddressed

8

Health-based

100

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Dec 2021 Resolved
Monitoring · Lead & Copper Rule began Jun 2021 Resolved
Other · EPA contaminant 7000 began Jul 2019 Resolved
Monitoring & reporting · Lead & Copper Rule began Dec 2015 Resolved
Max contaminant level (MCL) · Total coliform health-based began Dec 2014 Resolved
Max contaminant level (MCL) · Total coliform health-based began Jul 2013 Resolved
Monitoring & reporting · EPA contaminant 3014 began Nov 2012 Resolved
Max contaminant level (MCL) · Total coliform health-based began Nov 2012 Resolved
Monitoring & reporting · EPA contaminant 3014 began Sep 2012 Resolved
Monitoring & reporting · EPA contaminant 3014 began Sep 2012 Resolved
Monitoring & reporting · Total coliform began Aug 2011 Resolved
Monitoring & reporting · EPA contaminant 3014 began Jul 2011 Resolved

Recent enforcement actions

  • State action · SOX Feb 2025
  • State action · SIA Jan 2025
  • State action · SIE Jan 2025
  • State action · SOX Jan 2022
  • State action · SIA Jan 2022
  • State action · SIA Jul 2021
  • State action · SIE Jul 2021
  • State action · SOX Jul 2021

This profile is built from EPA public records for system MT0000418 — 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.