BLUE GRASS WATER USERS ASSOCIATION

BILLINGS, MT · ~60 people served

Check your exact address → BILLINGS overview

100

Excellent

PurityRadar safety score

PWSID

MT0004093

State

Montana

City

BILLINGS

Population served

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

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring · Lead & Copper Rule began Oct 2025 Resolved

Monitoring & reporting · Lead & Copper Rule began Dec 2024 Resolved

Monitoring & reporting · Lead & Copper Rule began Dec 2021 Resolved

Other · EPA contaminant 7000 began Jul 2021 Resolved

Monitoring & reporting · Chlorite began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2980 began Jan 2015 Resolved

Monitoring & reporting · EPA contaminant 2979 began Jan 2015 Resolved

Monitoring & reporting · EPA contaminant 2981 began Jan 2015 Resolved

Monitoring & reporting · EPA contaminant 2968 began Jan 2015 Resolved

Monitoring & reporting · EPA contaminant 2964 began Jan 2015 Resolved

Monitoring & reporting · EPA contaminant 2977 began Jan 2015 Resolved

Monitoring & reporting · EPA contaminant 2969 began Jan 2015 Resolved

Recent enforcement actions

State action · SIA Nov 2025
State action · SIE Nov 2025
State action · SOX Nov 2025
State action · SOX Feb 2025
State action · SIA Feb 2025
State action · SOX Feb 2023
State action · SOX Feb 2023
State action · SOX Feb 2023

This profile is built from EPA public records for system MT0004093 — 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.