HIDDEN LAKE YELLOWSTONE COUNTY W AND S D

BILLINGS, MT · ~350 people served

Check your exact address → BILLINGS overview

100

Excellent

PurityRadar safety score

PWSID

MT0003374

State

Montana

City

BILLINGS

Population served

350

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

105

Violations on record

Unaddressed

Health-based

162

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jan 2024. Official EPA record →

Monitoring & reporting · EPA contaminant 0700 began Nov 2023 Resolved

Monitoring & reporting · EPA contaminant 0700 began Aug 2021 Resolved

Monitoring & reporting · EPA contaminant 0700 began Apr 2020 Resolved

Monitoring & reporting · EPA contaminant 2979 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2378 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2380 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2969 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2964 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2955 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2968 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2976 began Jan 2020 Resolved

Monitoring & reporting · EPA contaminant 2977 began Jan 2020 Resolved

Recent enforcement actions

State action · SIF Jan 2024
State action · SIA Dec 2023
State action · SIE Dec 2023
State action · SOX Feb 2023
State action · SOX Feb 2023
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 MT0003374 — 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.