Direct answer
Radon enters through cracks in the foundation, sump pits, gaps around pipes, and porous concrete. Even tightly built homes accumulate radon because indoor air pressure pulls it up 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
- How much does radon mitigation cost in Cincinnati? →
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- Is your radon system warrantied? →
- Will a radon system increase my utility bills? →
- Will I hear the radon fan? →
- Do all Cincinnati homes need a radon mitigation system? →
Ready to get started in Cincinnati?
We connect Greater Cincinnati homeowners with NRPP-credentialed radon mitigators in our partner network. Mon–Sat 8am–7pm.