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Map of Radon Zones in Montana based on Environmental Protection Agency (EPA) data

Back to Radon Zones in the United States




Radon zones
 Zone 3 (0 counties)
 Zone 2 (7 counties)
 Zone 1 (49 counties)
  Highest Potential: counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones)
  Moderate Potential: counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones)
  Low Potential: counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones)
Beaverhead County
Radon zone : 1

Big Horn County
Radon zone : 1

Blaine County
Radon zone : 1

Broadwater County
Radon zone : 1

Carbon County
Radon zone : 1

Carter County
Radon zone : 1

Cascade County
Radon zone : 1

Chouteau County
Radon zone : 1

Custer County
Radon zone : 1

Daniels County
Radon zone : 1

Dawson County
Radon zone : 1

Deer Lodge County
Radon zone : 1

Fallon County
Radon zone : 1

Fergus County
Radon zone : 1

Flathead County
Radon zone : 1

Gallatin County
Radon zone : 1

Garfield County
Radon zone : 1

Glacier County
Radon zone : 1

Golden Valley County
Radon zone : 2

Granite County
Radon zone : 1

Hill County
Radon zone : 1

Jefferson County
Radon zone : 1

Judith Basin County
Radon zone : 1

Lake County
Radon zone : 1

Lewis and Clark County
Radon zone : 1

Liberty County
Radon zone : 1

Lincoln County
Radon zone : 1

Madison County
Radon zone : 1

McCone County
Radon zone : 1

Meagher County
Radon zone : 1

Mineral County
Radon zone : 1

Missoula County
Radon zone : 1

Musselshell County
Radon zone : 2

Park County
Radon zone : 1

Petroleum County
Radon zone : 2

Phillips County
Radon zone : 1

Pondera County
Radon zone : 1

Powder River County
Radon zone : 1

Powell County
Radon zone : 1

Prairie County
Radon zone : 1

Ravalli County
Radon zone : 1

Richland County
Radon zone : 1

Roosevelt County
Radon zone : 1

Rosebud County
Radon zone : 1

Sanders County
Radon zone : 1

Sheridan County
Radon zone : 1

Silver Bow County
Radon zone : 1

Stillwater County
Radon zone : 1

Sweet Grass County
Radon zone : 2

Teton County
Radon zone : 1

Toole County
Radon zone : 1

Treasure County
Radon zone : 2

Valley County
Radon zone : 1

Wheatland County
Radon zone : 2

Wibaux County
Radon zone : 1

Yellowstone County
Radon zone : 2


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