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Map of Radon Zones in the United States based on Environmental Protection Agency (EPA) data




Radon zones
 Zone 3 (1149 counties)
 Zone 2 (1043 counties)
 Zone 1 (1094 counties)
  Highest Potential: counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones)
  Moderate Potential: counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones)
  Low Potential: counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones)

Detailed data on county level:




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