About Radon Levels in Saint Clair County

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

The average indoor radon levels of Saint Clair County, as determined by radon test results from Air Chek, is 4.2 pCi/L

    Results under 2 pCi/L

    Results between 2 and 3.9 pCi/L

    Results 4 pCi/L and above

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

State Radon Officer

Radon Resources

• County Radiation Safety


• County Radiation Safety