About Radon Levels in King County

The average national indoor radon level is 1.3 pCi/L. (FAQ: What is a picocurie?)

The average indoor radon levels of King County, as determined by radon test results from Air Chek, is 1 pCi/L

Local News

Radon Risk Chart for King County

    Results under 2 pCi/L

    Results between 2 and 3.9 pCi/L

    Results 4 pCi/L and above

Check Your Own Radon Levels!

Additional information about radon levels in King County may be available through this website.

State Radon Officer

(800) 525-0127
Washington State Department of Health Radon Program
PO BOX 47827
Olympia WA, 98504-7827