For more detailed map click here
Page updated on February 29, 2012
(Based on 212,942 radon data points)
"Note: These maps show
only general trends in radon concentrations. The concentration found in
any given home can be substantially higher or lower than the average for
a county or even a zip code area. Homeowners in all parts of the state
are therefore advised to test their houses to make sure that the radon
concentrations are below 4 pCi/l."
