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

Back to Radon Zones in the United States




Radon zones
 Zone 3 (0 counties)
 Zone 2 (12 counties)
 Zone 1 (62 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)
Adams County
Radon zone : 1

Alamosa County
Radon zone : 2

Arapahoe County
Radon zone : 1

Archuleta County
Radon zone : 2

Baca County
Radon zone : 1

Bent County
Radon zone : 1

Boulder County
Radon zone : 1

Chaffee County
Radon zone : 1

Cheyenne County
Radon zone : 1

Clear Creek County
Radon zone : 1

Conejos County
Radon zone : 2

Costilla County
Radon zone : 2

Crowley County
Radon zone : 1

Custer County
Radon zone : 1

Delta County
Radon zone : 1

Denver County
Radon zone : 1

Dolores County
Radon zone : 1

Douglas County
Radon zone : 1

Eagle County
Radon zone : 2

El Paso County
Radon zone : 1

Elbert County
Radon zone : 1

Fremont County
Radon zone : 1

Garfield County
Radon zone : 1

Gilpin County
Radon zone : 1

Grand County
Radon zone : 1

Gunnison County
Radon zone : 1

Hinsdale County
Radon zone : 2

Huerfano County
Radon zone : 1

Jackson County
Radon zone : 1

Jefferson County
Radon zone : 1

Kiowa County
Radon zone : 1

Kit Carson County
Radon zone : 1

La Plata County
Radon zone : 2

Lake County
Radon zone : 1

Larimer County
Radon zone : 1

Las Animas County
Radon zone : 1

Lincoln County
Radon zone : 1

Logan County
Radon zone : 1

Mesa County
Radon zone : 1

Mineral County
Radon zone : 2

Moffat County
Radon zone : 1

Montezuma County
Radon zone : 1

Montrose County
Radon zone : 1

Morgan County
Radon zone : 1

Otero County
Radon zone : 1

Ouray County
Radon zone : 1

Park County
Radon zone : 1

Phillips County
Radon zone : 1

Pitkin County
Radon zone : 1

Prowers County
Radon zone : 1

Pueblo County
Radon zone : 1

Rio Blanco County
Radon zone : 1

Rio Grande County
Radon zone : 2

Routt County
Radon zone : 2

Saguache County
Radon zone : 2

San Juan County
Radon zone : 2

San Miguel County
Radon zone : 1

Sedgwick County
Radon zone : 1

Summit County
Radon zone : 1

Teller County
Radon zone : 1

Washington County
Radon zone : 1

Weld County
Radon zone : 1

Yuma County
Radon zone : 1


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