Certified Radon Mitigators
in Saint Louis, Missouri

St. Louis and the surrounding metro sit on a mix of glacial till, river-deposited alluvium, and Ordovician limestone, with radon risk that varies across the region but is consistently elevated in the western suburbs. St. Louis County — Chesterfield, Creve Coeur, and Ladue — is EPA Zone 1 and frequently tests above the action level. The city's old housing stock (many pre-war brick homes with stone or poured concrete basements) presents unique mitigation challenges that experienced St. Louis contractors handle routinely. Missouri has a large and competitive certified mitigator market.