State Overview
WA
Select your county below to view itemized mitigation estimates, local labor rates, and EPA zone risk factors.
Adams
Asotin
Benton
Chelan
Clallam
Clark
Columbia
Cowlitz
Douglas
Ferry
Franklin
Garfield
Grant
Grays Harbor
Island
Jefferson
King
Kitsap
Kittitas
Klickitat
Lewis
Lincoln
Mason
Okanogan
Pacific
Pend Oreille
Pierce
San Juan
Skagit
Skamania
Snohomish
Spokane
Stevens
Thurston
Wahkiakum
Walla Walla
Whatcom
Whitman
Yakima
WA Radon Levels by County
View EPA zone data and risk classifications
How to Test for Radon
Complete homeowner's testing guide
Why Does Cost Vary in WA?
Cost estimates across WA range due to local labor market conditions and specific EPA zone profiles. Foundation types (basement vs slab) also heavily impact material costs and permit requirements. Choose your specific county to narrow down your estimate bounds.