Radon Zone Map

All counties

Radon zones in Montana

Beaverhead CountyMontana1
Big Horn CountyMontana1
Blaine CountyMontana1
Carbon CountyMontana1
Carter CountyMontana1
Cascade CountyMontana1
Chouteau CountyMontana1
Custer CountyMontana1
Daniels CountyMontana1
Dawson CountyMontana1
Deer Lodge CountyMontana1
Fallon CountyMontana1
Fergus CountyMontana1
Flathead CountyMontana1
Gallatin CountyMontana1
Garfield CountyMontana1
Glacier CountyMontana1
Granite CountyMontana1
Hill CountyMontana1
Judith Basin CountyMontana1
Lake CountyMontana1
Lewis and Clark CountyMontana1
Liberty CountyMontana1
Lincoln CountyMontana1
Madison CountyMontana1
McCone CountyMontana1
Meagher CountyMontana1
Mineral CountyMontana1
Missoula CountyMontana1
Musselshell CountyMontana2
Park CountyMontana1
Petroleum CountyMontana2
Phillips CountyMontana1
Pondera CountyMontana1
Powder River CountyMontana1
Powell CountyMontana1
Prairie CountyMontana1
Ravalli CountyMontana1
Richland CountyMontana1
Roosevelt CountyMontana1
Sanders CountyMontana1
Sheridan CountyMontana1
Silver Bow CountyMontana1
Stillwater CountyMontana1
Sweet Grass CountyMontana2
Teton CountyMontana1
Toole CountyMontana1
Valley CountyMontana1
Wheatland CountyMontana2
Wibaux CountyMontana1
Yellowstone CountyMontana2

Sources

  1. Montana: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  2. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  3. Montana: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  4. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  5. Montana: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  6. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  7. Montana: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  8. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  9. Montana: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  10. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  11. Montana: EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026
  12. EPA Map of Radon Zones, US Environmental Protection Agency, checked 1 November 2026

"Secondary" marks a source used only because the official page could not be read.