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St. Clair County has fewer than 30 tests on record, so it doesn't meet our indexing gate. It appears as a row in theMissouri county table instead.
8% of 13 radon tests here were at or above 4 pCi/L (EPA's action level). Data through 2017. Source: Radon test results from laboratories.
Data through 2017 · Radon test results from laboratories
St. Clair County has fewer than 30 tests on record, so it doesn't meet our indexing gate. It appears as a row in theMissouri county table instead.