PWSID
MT0000170
State
Montana
City
BUTTE
Population served
33,000
Primary source
Surface water
Score history
No change since tracking began Jun 18, 2026.
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
88
Violations on record
0
Unaddressed
4
Health-based
53
Enforcement actions
From EPA ECHO (SDWIS), most recent enforcement Oct 2025. Official EPA record →
Recent enforcement actions
- State action · SOX Oct 2025
- State action · SIA Oct 2025
- State action · SIA Apr 2024
- State action · SIE Apr 2024
- State action · SOX Apr 2024
- State action · SOX May 2017
- State action · SFL Nov 2013
- State action · SIF Jun 2013
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.
Copper
4 stations · latest Nov 2023
Manganese
4 stations · latest Nov 2023
Arsenic
4 stations · latest Nov 2023
Lead
4 stations · latest Nov 2023
Fluoride
1 station · latest Oct 2023
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 MT0000170 — 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.