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Water system · PWSID MO1041186

SWAN LAKE ESTATES

TREGO, MT · ~115 people served

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

PWSID

MO1041186

State

Montana

City

TREGO

Population served

115

Primary source

GWP

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

15

Violations on record

1

Unaddressed

0

Health-based

33

Enforcement actions

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

Monitoring & reporting · Lead & Copper Rule began Oct 2025 Unaddressed
Other · EPA contaminant 7000 began Jul 2020 Resolved
Other · EPA contaminant 7000 began Jul 2019 Resolved
Monitoring & reporting · Total coliform began Sep 2005 Resolved
Monitoring & reporting · Total coliform began Dec 2004 Resolved
Monitoring & reporting · Total coliform began Nov 2004 Resolved
Monitoring & reporting · Total coliform began May 2002 Resolved
Monitoring & reporting · Total coliform began Dec 2001 Resolved
Monitoring & reporting · Lead & Copper Rule began Oct 2001 Resolved
Other · EPA contaminant 7000 began Jul 2001 Resolved
Monitoring & reporting · Total coliform began Jun 2001 Resolved
Monitoring & reporting · Total coliform began Nov 2000 Resolved

Recent enforcement actions

  • State action · SOX Jan 2021
  • State action · SIA Apr 2020
  • State action · SIA Dec 2018
  • State action · SOX Jan 2014
  • State action · SOX Jan 2014
  • State action · SIF Jun 2006
  • State action · SIF May 2006
  • State action · SIE Oct 2005

This profile is built from EPA public records for system MO1041186 — 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.