Direct answer
Radon enters through cracks in the slab, sump pits, gaps around plumbing/electrical penetrations, expansion joints, crawl space soil, and even through porous concrete itself. Indoor air pressure pulls it from soil gas.
Authoritative sources
- US EPA ↗
Cincinnati and surrounding counties sit in EPA Radon Zone 1, the highest-risk classification.
- EPA Citizen's Guide to Radon ↗
EPA recommends mitigation above 4.0 pCi/L and consideration of mitigation between 2.0 and 4.0 pCi/L.
- Ohio Department of Health ↗
Ohio Radon Program guidance on testing, mitigation, and contractor licensure.
Related questions
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Ready to get started in Cincinnati?
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