BLACK ROCK ESTATES SUBDIVISION

BILLINGS, MT · ~75 people served

Check your exact address → BILLINGS overview

100

Excellent

PurityRadar safety score

PWSID

MT0004881

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

Latest detections from EPA’s UCMR5 monitoring (through Oct 2024). Levels in parts per trillion (ppt).

Lithium

84,000 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

From EPA ECHO (SDWIS), most recent enforcement Jul 2023. Official EPA record →

Other · EPA contaminant 7000 began Jul 2023 Resolved

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

Monitoring & reporting · EPA contaminant 2041 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2046 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2050 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2051 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2067 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2065 began Jul 2019 Resolved

Monitoring & reporting · Chlorite began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2005 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2110 began Jul 2019 Resolved

Monitoring & reporting · EPA contaminant 2042 began Jul 2019 Resolved

Recent enforcement actions

State action · SIA Jul 2023
State action · SOX Jul 2023
State action · SOX Sep 2022
State action · SIA Oct 2021
State action · SIE Oct 2021
State action · SOX Nov 2019
State action · SOX Nov 2019
State action · SOX Nov 2019

This profile is built from EPA public records for system MT0004881 — 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.