About Radon Levels in Lewis and Clark County

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

The average indoor radon levels of Lewis and Clark County, as determined by radon test results from Air Chek, is 7.9 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 Lewis and Clark County may be available through this website.

State Radon Officer