Radon zones in Washington
Zone 1: 7, Zone 2: 14, Zone 3: 18. A zone is an area estimate; EPA says all homes should be tested.
- Adams County Zone 2
- Asotin County Zone 2
- Benton County Zone 2
- Chelan County Zone 3
- Clallam County Zone 3
- Clark County Zone 1
- Columbia County Zone 2
- Cowlitz County Zone 3
- Douglas County Zone 2
- Ferry County Zone 1
- Franklin County Zone 2
- Garfield County Zone 2
- Grant County Zone 2
- Grays Harbor County Zone 3
- Island County Zone 3
- Jefferson County Zone 3
- King County Zone 3
- Kitsap County Zone 3
- Kittitas County Zone 2
- Klickitat County Zone 2
- Lewis County Zone 3
- Lincoln County Zone 2
- Mason County Zone 3
- Okanogan County Zone 1
- Pacific County Zone 3
- Pend Oreille County Zone 1
- Pierce County Zone 3
- San Juan County Zone 3
- Skagit County Zone 3
- Skamania County Zone 1
- Snohomish County Zone 3
- Spokane County Zone 1
- Stevens County Zone 1
- Thurston County Zone 3
- Wahkiakum County Zone 3
- Walla Walla County Zone 2
- Whatcom County Zone 3
- Whitman County Zone 2
- Yakima County Zone 2
County not listed? See what we left out and why. Leave your email to hear if this data changes.