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The Florida Department of Health works to protect, promote & improve the health of all people in Florida through integrated state, county, & community efforts.

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Protection Maps

Radon and Indoor Air Program

The Florida Radon Protection Maps were developed by the Florida Department of Business and Professional Regulation, Division of Codes and Standards

You may examine separately the Department of Business and Professional Regulation (Formerly within the Department of Community Affairs) radon protection maps by county for large buildings and for single family homes and duplexes (residences). These maps describe the areas of the state where added radon resistant measures beyond the current energy efficient building code are needed to prevent indoor radon problems. Currently these standards are voluntary. It would take a majority of the building permit issuing agencies in any county to adopt them for the standards to become a require code within that county. Only those counties that have areas where added radon resistant features are recommended have maps.

These maps say nothing about the prevalence of existing radon problems or the odds of an existing building having a radon problem.  The maps represent the radon potential for buildings constructed on native soil with minimal disturbance of the ground.  Radon source potential is defined as the average rate at wich radon would enter a reference house that is modeled on specific soil profiles. However during construction there is a great deal of digging that may unearth higher radium soil.  Fill brought in during construction may also introduce higher radium into a building site.  For specific information about soil types contact the Florida Geological Survey. The only way to know if a building has a radon problem is to test after completion.

The maps linked below are color coded.  Red areas are zones where active radon control is recommended (ARC).  Yellow areas are zones where passive radon control is recommended (PRC).  Finally, green areas are zones where radon control is generally unnecessary (RCU).

  Radon Protection Maps
Radon Control (RC) Recommendations:  ARC = Active 
  PRC = Passive - RCU = Generally Unnecessary
Single Family and Duplexes   Large Buildings
Alachua X X X   X X X
Brevard X X X   X X X
Broward           X X
Calhoun           X X
Charlotte X X X   X X X
Citrus   X X     X X
Columbia           X X
De Soto X X   X X X
Dixie           X X
Duval   X X     X X
Gadsden X X   X X X
Gilchrist   X X     X X
Gulf           X X
Hamilton           X X
Hardee X X X   X X X
Hernando   X X     X X
Highlands X X X   X X X
Hillsborough X X X   X X X
Holmes           X X
Indian River X X X   X X X
Jackson   X X     X X
Jefferson   X X     X X
Leon X X X     X X
Levy   X X     X X
Liberty           X X
Madison           X X
Manatee X X X   X X X
Marion X X X   X X X
Martin   X X     X X
Miami-Dade           X X
Nassau   X X     X X
Okaloosa           X X
Osceola X   X     X X
Palm Beach           X X
Pasco           X X
Pinellas           X X
Polk X X X   X X X
Putnam X   X   X   X
Saint Johns           X X
Saint Lucie           X X
Santa Rosa              
Sarasota X X X   X X X
Seminole X   X   X   X
Sumter   X X     X X
Suwannee   X X     X X
Taylor           X X
Union   X X     X X
Volusia   X X     X X
Walton         X   X

These maps were developed by the program mapping group as part of the Florida Radon Research Project, and published in 1995, and are currently used by the radon program. The program mapping group consisted of:

Radon Potential Zone Map

The only way to know your radon level is to test your building.  This Florida radon zone map shows areas where it is very likely there will be elevated radon levels.  Zone 1 counties (red) are those with a predicted radon level greater than 4 picoCuries per liter (pCi/L) or high risk counties.  Zone 2 counties (orange) are those with a predicted radon level between 2 and 4 pCi/L or medium risk counties.   Zone 3 counties (yellolw) are those with a predicted radon level less than 2 pCi/L or low risk.

For more information on radon resistant construction contact: