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State overview
Radon in Ohio
Of Ohio's 88 counties and county equivalents, EPA places 53 in Zone 1, 35 in Zone 2. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Ohio stories
- Rep. Bryant Bailey Introduces Legislation to Protect Ohio Families and Students from Radon ExposureOhio House of Representatives (.gov) · 2026-04-22
- Ohio House bills would require radon testing in schools, at home salesThe Columbus Dispatch · 2026-04-22
- Radon testing would be required in schools under new bill in Ohio HouseThe Columbus Dispatch · 2026-04-15
- Radon testing could be required in schools under proposed Ohio House billThe Columbus Dispatch · 2026-03-23
- Free radon testing kits available in the Mid-Ohio ValleyWTAP · 2026-01-28
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 88 counties
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).