Radon zones in Colorado
Zone 1: 52, Zone 2: 11, Zone 3: 0. A zone is an area estimate; EPA says all homes should be tested.
- Adams County Zone 1
- Alamosa County Zone 2
- Arapahoe County Zone 1
- Archuleta County Zone 2
- Baca County Zone 1
- Bent County Zone 1
- Boulder County Zone 1
- Broomfield County Zone 1
- Chaffee County Zone 1
- Cheyenne County Zone 1
- Clear Creek County Zone 1
- Conejos County Zone 2
- Costilla County Zone 2
- Crowley County Zone 1
- Custer County Zone 1
- Delta County Zone 1
- Denver County Zone 1
- Dolores County Zone 1
- Douglas County Zone 1
- Eagle County Zone 2
- Elbert County Zone 1
- El Paso County Zone 1
- Fremont County Zone 1
- Garfield County Zone 1
- Gilpin County Zone 1
- Grand County Zone 1
- Gunnison County Zone 1
- Hinsdale County Zone 2
- Huerfano County Zone 1
- Jackson County Zone 1
- Jefferson County Zone 1
- Kiowa County Zone 1
- Kit Carson County Zone 1
- Lake County Zone 1
- Larimer County Zone 1
- Las Animas County Zone 1
- Lincoln County Zone 1
- Logan County Zone 1
- Mesa County Zone 1
- Mineral County Zone 2
- Moffat County Zone 1
- Montezuma County Zone 1
- Montrose County Zone 1
- Morgan County Zone 1
- Otero County Zone 1
- Ouray County Zone 1
- Park County Zone 1
- Phillips County Zone 1
- Pitkin County Zone 1
- Prowers County Zone 1
- Pueblo County Zone 1
- Rio Blanco County Zone 1
- Rio Grande County Zone 2
- Routt County Zone 2
- Saguache County Zone 2
- San Juan County Zone 2
- San Miguel County Zone 1
- Sedgwick County Zone 1
- Summit County Zone 1
- Teller County Zone 1
- Washington County Zone 1
- Weld County Zone 1
- Yuma County Zone 1
County not listed? See what we left out and why. Leave your email to hear if this data changes.