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

Back to Radon Zones in the United States




Radon zones
 Zone 3 (28 counties)
 Zone 2 (14 counties)
 Zone 1 (7 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 : 2

Asotin County
Radon zone : 2

Benton County
Radon zone : 2

Chelan County
Radon zone : 3

Clallam County
Radon zone : 3

Clark County
Radon zone : 1

Columbia County
Radon zone : 2

Cowlitz County
Radon zone : 3

Douglas County
Radon zone : 2

Ferry County
Radon zone : 1

Franklin County
Radon zone : 2

Garfield County
Radon zone : 2

Grant County
Radon zone : 2

Grays Harbor County
Radon zone : 3

Island County
Radon zone : 3

Jefferson County
Radon zone : 3

King County
Radon zone : 3

Kitsap County
Radon zone : 3

Kittitas County
Radon zone : 2

Klickitat County
Radon zone : 2

Lewis County
Radon zone : 3

Lincoln County
Radon zone : 2

Mason County
Radon zone : 3

Okanogan County
Radon zone : 1

Pacific County
Radon zone : 3

Pend Oreille County
Radon zone : 1

Pierce County
Radon zone : 3

San Juan County
Radon zone : 3

Skagit County
Radon zone : 3

Skamania County
Radon zone : 1

Snohomish County
Radon zone : 3

Spokane County
Radon zone : 1

Stevens County
Radon zone : 1

Thurston County
Radon zone : 3

Wahkiakum County
Radon zone : 3

Walla Walla County
Radon zone : 2

Whatcom County
Radon zone : 3

Whitman County
Radon zone : 2

Yakima County
Radon zone : 2


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