Is there an EPA map showing the radon levels for the US?
The above US map is also available at the US EPA website. US EPA Zone Map of Radon Level Potential
  Predicted average indoor radon screening level
  • Zone 1 counties : greater than 4 pCi/L
  • Zone 2 counties : between 2 and 4 pCi/L
  • Zone 3 counties : less than 2 pCi/L

You may also wish to explore our map of State Radon Levels. This map allows you to download a summary of all the radon tests that we have made at individual addresses in your state. The data provided include the average radon levels for every state in the country, as well as the number of tests performed and the percentage of radon tests that were above the EPA action level of 4 pCi/L.

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