Montana Water Quality Ratings

TapWaterSafety has rated 4 public water systems in Montana, serving a combined 298,200 residents. The statewide average grade is D.

Data sources: EPA SDWIS EPA ECHO EWG Tap Water Database Utility CCRs ⓘ How did we get these ratings?
State average grade
D
64/100
Total utilities rated 4
Population served 298,200

Top water quality concerns in Montana

  • Haloacetic acids (HAA9) significantly above health guideline
  • Arsenic significantly above health guideline
  • Haloacetic acids (HAA5) significantly above health guideline
  • Total trihalomethanes (TTHMs) significantly above health guideline
  • Arsenic detected

Cities in Montana

Browse tap water quality reports by city. Click any city to see its grade, what's in the water, and recommended filters.

BILLINGS
F 114,000
BOZEMAN
D 56,000
GREAT FALLS
D 60,000
MISSOULA
D 68,200

Grade distribution

A
0 (0%)
B
0 (0%)
C
2 (50%)
D
2 (50%)
F
0 (0%)

All rated utilities in Montana

Sorted by score, highest first. Click any utility to see the full grade card.

Rank Utility City Population Score Grade
#1 MISSOULA WATER MISSOULA 68,200 69 C
#2 BOZEMAN CITY OF BOZEMAN 56,000 67 C
#3 GREAT FALLS CITY OF GREAT FALLS 60,000 62 D
#4 BILLINGS CITY OF BILLINGS 114,000 58 D