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RRNC Large Buildings

Radon and Indoor Air Program

Radon Protection Map For Large Building Construction 

*Note: This page contains materials in the Portable Document Format (PDF). The free Adobe Reader may be required to view these files.

These maps were developed through a comprehensive research study coordinated by the former Department of Community Affairs (DCA) in the mid-1990s.

The counties below have areas where the addition of radon resistant construction features are recommended to prevent radon problems (more than 5% of new large buildings are expected to have annual average radon levels above the U.S. Environmental Protecton Agency action level in the identified areas).

Counties not listed are those where fewer than 5% of new large buildings are expected to have elevated radon levels, so additional radon resistant construction techniques may not be needed to prevent radon problems.


Recommendations for Large Buildings (County Maps)
AlachuaDuvalIndian RiverNassauSt. Johns
BrevardGadsdenJacksonOkaloosaSt. Lucie
BrowardGilchrestJeffersonOsceolaSumter
CalhounGulfLeonPalm BeachSuwannee
CharlotteHamiltonLevyPascoTaylor
CitrusHardeeLibertyPinellasUnion
ColumbiaHernandoMadisonPolkVolusia
DadeHighlandsManateePutnamWalton
De SotoHillsboroughMarionSarasota 
DixieHolmesMartinSeminole

The county maps will identify areas where additional radon resistant construction features should be incorporated in new construction to reduce the likelihood of elevated radon levels in a new buildings. It does not reflect radon levels in existing structures. It should NOT be used for predicting indoor radon levels in buildings that have not been tested for radon. The only way to know if a building has a radon problem is to test the building.

For more information on radon resistant construction: