Certified Radon Mitigators
in Philadelphia, Pennsylvania

Philadelphia and the surrounding Delaware Valley sit on the Piedmont's crystalline rock — the same geological formation that drives high radon across southeastern Pennsylvania, Maryland, and Delaware. The EPA classifies most of Philadelphia's suburbs (Chester, Montgomery, Delaware, and Bucks counties) as Zone 1, with average indoor readings well above the national norm. Row homes and twin houses common in the city proper present unique mitigation challenges — shared walls, common basements, and varying foundation types — but certified Philadelphia contractors have extensive experience with urban attached housing. Pennsylvania requires radon contractor certification through the DEP.