Radon zones in Montana
Zone 1: 50, Zone 2: 7, Zone 3: 0. A zone is an area estimate; EPA says all homes should be tested.
- Beaverhead County Zone 1
- Big Horn County Zone 1
- Blaine County Zone 1
- Broadwater County Zone 1
- Carbon County Zone 1
- Carter County Zone 1
- Cascade County Zone 1
- Chouteau County Zone 1
- Custer County Zone 1
- Daniels County Zone 1
- Dawson County Zone 1
- Deer Lodge County Zone 1
- Fallon County Zone 1
- Fergus County Zone 1
- Flathead County Zone 1
- Gallatin County Zone 1
- Garfield County Zone 1
- Glacier County Zone 1
- Golden Valley County Zone 2
- Granite County Zone 1
- Hill County Zone 1
- Jefferson County Zone 1
- Judith Basin County Zone 1
- Lake County Zone 1
- Lewis and Clark County Zone 1
- Liberty County Zone 1
- Lincoln County Zone 1
- McCone County Zone 1
- Madison County Zone 1
- Meagher County Zone 1
- Mineral County Zone 1
- Missoula County Zone 1
- Musselshell County Zone 2
- Park County Zone 1
- Petroleum County Zone 2
- Phillips County Zone 1
- Pondera County Zone 1
- Powder River County Zone 1
- Powell County Zone 1
- Prairie County Zone 1
- Ravalli County Zone 1
- Richland County Zone 1
- Roosevelt County Zone 1
- Rosebud County Zone 1
- Sanders County Zone 1
- Sheridan County Zone 1
- Silver Bow County Zone 1
- Stillwater County Zone 1
- Sweet Grass County Zone 2
- Teton County Zone 1
- Toole County Zone 1
- Treasure County Zone 2
- Valley County Zone 1
- Wheatland County Zone 2
- Wibaux County Zone 1
- Yellowstone County Zone 2
- Yellowstone National Park Zone 1
County not listed? See what we left out and why. Leave your email to hear if this data changes.