💧 ZIP Water Report

Tap water in Great Falls, MT — ZIP 59405

2 public water systems serving about 68,850 people. PFAS "forever chemicals" have been detected here.

C
Fair
PFAS detected: at least one system serving this ZIP reported PFAS in EPA UCMR 5 testing. Levels and the 2024 federal limits are shown per system below.

Water systems serving 59405

Great Falls City Of
PWSID MT0000525 · serves 60,000 · surface water
0 health-based / 0 total violations (5 yrs)
A
Malmstrom Air Force Base
PWSID MT0000515 · serves 8,850 · surface water
0 health-based / 5 total violations (5 yrs) · PFAS up to 7 ppt
C

Grades summarize EPA SDWIS violation records (last 5 years) and UCMR 5 PFAS results. They are informational, not a health determination. Methodology