waterbycounty

Montana Water Quality

Drinking water data for all 56 counties.

Avg Water Score

98.2

State Grade

A

Counties with Data

55

of 56 total

All Montana Counties

CountyWater Score
Big Horn County100.0
Broadwater County100.0
Carter County100.0
Daniels County100.0
Deer Lodge County100.0
Fallon County100.0
Flathead County100.0
Garfield County100.0
Glacier County100.0
Judith Basin County100.0
McCone County100.0
Meagher County100.0
Musselshell County100.0
Petroleum County100.0
Powder River County100.0
Powell County100.0
Ravalli County100.0
Roosevelt County100.0
Sanders County100.0
Sheridan County100.0
Silver Bow County100.0
Stillwater County100.0
Sweet Grass County100.0
Wheatland County100.0
Cascade County99.9
Gallatin County99.9
Missoula County99.9
Park County99.9
Yellowstone County99.9
Beaverhead County99.8
Phillips County99.8
Teton County99.8
Lake County99.7
Madison County99.7
Valley County99.7
Carbon County99.6
Hill County99.6
Lewis and Clark County99.6
Mineral County99.6
Toole County99.6
Chouteau County99.5
Lincoln County99.5
Pondera County99.1
Custer County99.0
Dawson County98.9
Wibaux County98.3
Richland County98.2
Rosebud County97.0
Jefferson County95.1
Golden Valley County92.6
Liberty County92.5
Granite County91.6
Fergus County90.3
Blaine County86.5
Treasure County66.8
Prairie County—

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Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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