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State overview
Radon in Pennsylvania
Of Pennsylvania's 67 counties and county equivalents, EPA places 49 in Zone 1, 17 in Zone 2, 1 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
Pennsylvania stories
- Quantifying mean, variability, and uncertainty in indoor radon exposure in Pennsylvania using random forest and quantile regression forest modelsNature · 2026-03-05
- Pennsylvania struggles with radon exposure and smoking rates in fight against lung cancerWTAE · 2025-11-05
- New Report Reveals Pennsylvania Ranks 6th in U.S. for Lowest Rate of Untreated Lung Cancer Patients and Among Best for Survival; Smoking and Radon Exposure Worse than National AveragesAmerican Lung Association · 2025-11-04
- Radon testing urged for all Pennsylvania homes this January, DEP saysCBS News · 2025-01-16
- Radon Action Month: DEP offers resources for radon testing in Pennsylvania homesfox56.com · 2025-01-14
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 67 counties
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).