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Water system · PWSID MT0000158

BOULDER CITY OF

BOULDER, MT · ~1,400 people served

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

PWSID

MT0000158

State

Montana

City

BOULDER

Population served

1,400

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

86

Violations on record

0

Unaddressed

6

Health-based

97

Enforcement actions

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

Monitoring & reporting · Total trihalomethanes (TTHM) began Jan 2024 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Jan 2024 Resolved
Treatment technique · EPA contaminant 0200 health-based began Jul 2022 Resolved
Monitoring · Lead & Copper Rule began Sep 2018 Resolved
Monitoring & reporting · Haloacetic acids (HAA5) began Sep 2014 Resolved
Monitoring & reporting · Total trihalomethanes (TTHM) began Sep 2014 Resolved
Monitoring & reporting · Fluoride began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 1085 began Jan 2011 Resolved
Monitoring & reporting · Barium began Jan 2011 Resolved
Monitoring & reporting · Barium began Jan 2011 Resolved
Monitoring & reporting · EPA contaminant 1036 began Jan 2011 Resolved
Monitoring & reporting · Cadmium began Jan 2011 Resolved

Recent enforcement actions

  • State action · SOX Jan 2025
  • State action · SIA Jan 2025
  • State action · SIE Jan 2025
  • State action · SIA Jul 2022
  • State action · SOX Jul 2022
  • State action · SIE Jul 2022
  • State action · SIF Jul 2022
  • State action · SIE Oct 2018

This profile is built from EPA public records for system MT0000158 — 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.