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About Radon Levels in Saint Louis County

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

The average indoor radon levels of Saint Louis County, as determined by radon test results from Air Chek, is 3.4 pCi/L

Local News

Radon Risk Chart for Saint Louis 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 Saint Louis County may be available through this website.


State Radon Officer

Brandi Hamilton
(573) 751-6102
Missouri Department of Health and Senior Services
PO Box 570
Jefferson City MO, 65102