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How much radon shows up in home tests?

Ohio Department of Health, radon levels by ZIP code: every test reported by Ohio-licensed radon professionals since 2010, before any mitigation, updated monthly. The map shows the ZIP's average; ZIPs with fewer than five tests are left grey. A ZIP average says nothing about one house, and EPA's advice is the same everywhere: test, and fix at 4 pCi/L or more.

937 of 1,233 ZIPs have data; median 4.3 pCi/L.

Under 2 pCi/L · 64 2 to 4 pCi/L · 346 4 to 8 pCi/L · 422 8 to 12 pCi/L · 82 12 pCi/L and up · 23 Too few tests · 296

Highest and lowest

Highest

  1. 43014 · Union Township and Danville35.3 pCi/L
  2. 44431 · Leetonia20.5 pCi/L
  3. 43837 · Port Washington18.6 pCi/L
  4. 44864 · Green Township and Perrysville18.6 pCi/L
  5. 44637 · Killbuck Township and Killbuck17.9 pCi/L
  6. 43844 · Jefferson Township and Warsaw16.6 pCi/L
  7. 43755 · Madison Township and Lore City16.4 pCi/L
  8. 43749 · Monroe Township and Kimbolton16.3 pCi/L
  9. 43080 · Utica16.1 pCi/L
  10. 44669 · Paris Township and Paris16.1 pCi/L
  11. 43028 · Howard Township and Howard15.8 pCi/L
  12. 45111 · Symmes Township and Camp Dennison15.7 pCi/L
  13. 43149 · Good Hope Township and Rockbridge15.7 pCi/L
  14. 43945 · Salineville15.5 pCi/L
  15. 44455 · Middleton Township and Rogers15.1 pCi/L

Lowest

  1. 45340 · Salem Township and Maplewood0.6 pCi/L
  2. 45882 · Rockford0.7 pCi/L
  3. 45693 · West Union0.8 pCi/L
  4. 44110 · Cleveland0.8 pCi/L
  5. 45651 · Mcarthur and Mc Arthur0.8 pCi/L
  6. 45692 · Wellston0.8 pCi/L
  7. 43604 · Toledo0.8 pCi/L
  8. 44507 · Youngstown0.9 pCi/L
  9. 45203 · Cincinnati1.0 pCi/L
  10. 43032 · Brown Township and Kilbourne1.1 pCi/L
  11. 45204 · Cincinnati1.1 pCi/L
  12. 45764 · Nelsonville1.1 pCi/L
  13. 44115 · Cleveland1.1 pCi/L
  14. 45225 · Cincinnati1.2 pCi/L
  15. 44807 · Attica1.2 pCi/L

Source

Ohio Department of Health radon test results by ZIP code since 2010 (pre-mitigation), ZIPs with five or more tests

ODH radon program

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Cite this page as:

Ohio Hometown Atlas (Open Shower Co), "Radon", https://hometownatlas.openshowerco.com/topics/radon/, built 2026-09-15, accessed [date].

Machine-readable: /api/topics/radon.json (open JSON, CC BY 4.0 for the compilation; the underlying records keep their own terms) · How to cite · Report a correction · Built 2026-09-15