Radon in Florida

About 1 in 4 homes tested in Florida were at or above the EPA action level of 4 pCi/L.

44%32%23%

46,241 homes tested, 2008–2017

Below 2 pCi/L: 44%
2 to 4 pCi/L: 32%
4 pCi/L or more: 23%

The line marks the EPA action level, 4 pCi/L.

The EPA puts 0 of Florida's 67 counties in Zone 1, its highest radon category, 9 in Zone 2 and 58 in Zone 3.

Every county in Florida

Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.

County	Homes tested	At or above 4	Median	EPA zone
Dixie County	1 tests	–	–	3
Union County	2 tests	–	–	2
Marion County		43%	3.3 pCi/L	2
Alachua County		35%	2.9 pCi/L	2
Polk County		28%	2.1 pCi/L	2
Collier County		26%	2.4 pCi/L	3
Sumter County		26%	1.7 pCi/L	3
Charlotte County		25%	2.2 pCi/L	3
Lee County		25%	2.4 pCi/L	3
Leon County		23%	2.2 pCi/L	2
Monroe County	11 tests	–	–	3
Walton County	9 tests	–	–	3
Miami-Dade County		19%	1.6 pCi/L	2
Sarasota County		18%	1.8 pCi/L	3
Hillsborough County		18%	1.3 pCi/L	2
Clay County		13%	1.2 pCi/L	3
Levy County		13%	1.9 pCi/L	3
Manatee County		13%	1.7 pCi/L	3
Bay County	10 tests	–	–	3
Madison County	6 tests	–	–	3
Pinellas County		12%	0.8 pCi/L	3
Martin County		11%	0.8 pCi/L	3
Pasco County		10%	0.8 pCi/L	3
Citrus County		10%	1.6 pCi/L	2
Wakulla County		9%	1.5 pCi/L	3
Palm Beach County		8%	1.0 pCi/L	3
Broward County		8%	1.1 pCi/L	3
Hendry County	7 tests	–	–	3
Columbia County		7%	1.0 pCi/L	2
Gadsden County		6%	1.2 pCi/L	3
Jefferson County		6%	1.4 pCi/L	3
Jackson County		6%	0.7 pCi/L	3
St. Johns County		6%	0.7 pCi/L	3
Flagler County	12 tests	–	–	3
DeSoto County		4%	0.6 pCi/L	3
Seminole County		4%	0.7 pCi/L	3
Orange County		4%	1.1 pCi/L	3
Lake County		3%	0.9 pCi/L	3
Okaloosa County		3%	0.6 pCi/L	3
Brevard County		3%	0.8 pCi/L	3
Indian River County		3%	0.7 pCi/L	3
Nassau County		2%	0.7 pCi/L	3
Santa Rosa County		2%	0.8 pCi/L	3
Hernando County		2%	0.8 pCi/L	3
Volusia County		2%	0.7 pCi/L	3
Escambia County		2%	0.9 pCi/L	3
Duval County		1%	0.5 pCi/L	3
Putnam County		1%	0.1 pCi/L	3
Osceola County		1%	0.8 pCi/L	3
Baker County	1 tests	–	–	3
Bradford County	4 tests	–	–	3
Franklin County	3 tests	–	–	3
Gilchrist County	8 tests	–	–	3
Glades County	2 tests	–	–	3
Hardee County	1 tests	–	–	3
Highlands County		0%	0.7 pCi/L	3
Holmes County	2 tests	–	–	3
Okeechobee County	3 tests	–	–	3
St. Lucie County		0%	0.1 pCi/L	3
Suwannee County		0%	1.1 pCi/L	3
Taylor County	3 tests	–	–	3
Washington County	1 tests	–	–	3
Calhoun County	No data	–	–	3
Gulf County	No data	–	–	3
Hamilton County	No data	–	–	3
Lafayette County	No data	–	–	3
Liberty County	No data	–	–	3

"–" means fewer than 20 tests or no lab data, too few for a reliable figure.

Sources

EPA Map of Radon Zones (public domain).
CDC Environmental Public Health Tracking Network, radon tests from labs, 2008–2017. Pre-mitigation tests only.

Last updated October 2026. How we calculate these numbers.