BIG SKY COUNTY WATER AND SEWER DIST 363

BIG SKY, MT · ~4,132 people served

Check your exact address → BIG SKY overview

100

Excellent

PurityRadar safety score

PWSID

MT0002385

State

Montana

City

BIG SKY

Population served

4,132

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 Sep 2025). Levels in parts per trillion (ppt).

PFBS

3.1 ppt

limit —

No federal limit

Violations & enforcement

Violations on record

Unaddressed

Health-based

Enforcement actions

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

Monitoring & reporting · Thallium began Apr 2025 Resolved

Other · EPA contaminant 7000 began Jul 2020 Resolved

Monitoring & reporting · EPA contaminant 1094 began Jan 2020 Resolved

Other · EPA contaminant 7000 began Jul 2014 Resolved

Monitoring & reporting · Lead & Copper Rule began Jan 2014 Resolved

Max contaminant level (MCL) · Total coliform health-based began Jan 2012 Resolved

Monitoring & reporting · Thallium began Jan 2012 Resolved

Monitoring & reporting · EPA contaminant 1094 began Jan 2011 Resolved

Monitoring & reporting · Thallium began Jan 2009 Resolved

Recent enforcement actions

State action · SIE Jul 2025
State action · SIA Jul 2025
State action · SOX Jul 2025
State action · SOX Oct 2024
State action · SIA Jan 2023
State action · SIE Jan 2023
State action · SOX Aug 2020
State action · SIA Jul 2020

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

Nitrate

1 station · latest Sep 2023

0.021 · max 0.025 mg/L · 2

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 MT0002385 — 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.