Direct answer
EPA recommends testing every 2 years and after any foundation work, HVAC changes, or basement renovation. Real-estate transactions also require fresh testing within the past 6 months.
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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