Direct answer
Only homes that test above 4.0 pCi/L (the EPA action level) require mitigation. About 1 in 3 tested Cincinnati-area homes exceed this threshold. Test first, mitigate only if needed.
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.
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