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Water system · PWSID MT0000187

COOKE CITY WATER DISTRICT

COOKE CITY, MT · ~300 people served

Check your exact address → COOKE CITY overview
100
Excellent
PurityRadar safety score

PWSID

MT0000187

State

Montana

City

COOKE CITY

Population served

300

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

218

Violations on record

0

Unaddressed

8

Health-based

205

Enforcement actions

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

Other · EPA contaminant 7000 began Jul 2025 Resolved
Other · EPA contaminant 7000 began Jul 2024 Resolved
Other · EPA contaminant 7000 began Oct 2023 Resolved
Monitoring · Lead & Copper Rule began May 2023 Resolved
Other · EPA contaminant 7000 began Jul 2022 Resolved
Monitoring & reporting · EPA contaminant 2039 began Jan 2021 Resolved
Monitoring & reporting · EPA contaminant 2039 began Oct 2020 Resolved
Monitoring · Lead & Copper Rule began Sep 2020 Resolved
Other · EPA contaminant 7000 began Jul 2020 Resolved
Monitoring & reporting · EPA contaminant 2005 began Apr 2020 Resolved
Monitoring & reporting · EPA contaminant 2031 began Apr 2020 Resolved
Monitoring & reporting · EPA contaminant 2040 began Apr 2020 Resolved

Recent enforcement actions

  • State action · SOX Jul 2025
  • State action · SIA Jul 2025
  • State action · SOX Jul 2024
  • State action · SIA Jul 2024
  • State action · SOX Nov 2023
  • State action · SIA Oct 2023
  • State action · SIF Jul 2023
  • State action · SIA Jun 2023

Area water-quality monitoring

Environmental monitoring (rivers, wells, intakes) recorded in this system’s service area in the EPA/USGS Water Quality Portal since 2018 — source/ambient water, not finished tap water. Context for the watershed, not a reading from your tap.

ContaminantMedian · max · samples

Copper

2 stations · latest Aug 2025

0.004 · max 0.01 mg/L · 4

Lead

2 stations · latest Aug 2025

0.0006 · max 0.001 mg/L · 2

Manganese

1 station · latest Aug 2025

0.004 · max 0.004 mg/L · 1

Source: Water Quality Portal (EPA/USGS/state agencies). Values are as-reported and aren’t health thresholds.

This profile is built from EPA public records for system MT0000187 — 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.