Any home could have a problem.
YOU CANNOT ESTIMATE radon levels by neighborhood, home age, home design (on slab, crawl space or basement), energy efficiency, or even what the home next door reads.
TESTING IS THE ONLY WAY TO KNOW.
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Red (Zone 1) counties are those where health department survey data in homes has indicated an average radon concentration greater than the EPA action level of 4.0 pCi/L.
Health department data for Johnson County Kansas indicates about 43% of homes are above EPA guidance. The Kansas City area showed about 1 in every 3 homes to be above above EPA guidance.
Levels between 4-20 pCi/l are very common. Homes are only occasionally far above 20 pCi/l.
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