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Radon zones in Florida

The EPA assigns every county in Florida to one of three radon potential zones. No county in Florida is in Zone 1. That is a statement about predicted county averages, not about any individual home - homes above the action level are found in all three zones.

67
Counties
0
Zone 1 counties
Predicted average above 4 pCi/L
9
Zone 2 counties
Predicted average 2-4 pCi/L
58
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across Florida

Every county in Florida, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 0Zone 2 · 9Zone 3 · 58

Hover a county · click to open it

County by county

All 67 Florida counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Alachua County2286k6.0%11.2%32.2
Citrus County2167k11.1%15.2%48.1
Columbia County273k10.1%18.2%46.5
Hillsborough County21.5M6.0%12.1%30.4
Leon County2297k5.9%11.3%28.9
Marion County2410k9.8%14.8%40.8
Miami-Dade County22.7M5.3%11.3%22.2
Polk County2818k8.0%14.4%35.2
Union County216k10.0%20.1%99.0
Baker County328k8.3%16.6%49.2
Bay County3191k7.9%14.6%41.2
Bradford County328k10.5%19.3%47.5
Brevard County3644k7.8%12.5%37.0
Broward County32.0M6.3%11.8%24.2
Calhoun County313k11.1%20.2%52.7
Charlotte County3206k9.7%12.8%34.1
Clay County3232k7.0%13.5%38.9
Collier County3404k8.0%10.3%19.2
DeSoto County336k12.1%19.6%42.6
Dixie County317k12.2%20.0%61.3
Duval County31.0M7.0%13.9%36.5
Escambia County3327k7.8%14.2%46.2
Flagler County3131k8.6%12.2%35.3
Franklin County313k10.8%16.6%33.0
Gadsden County344k11.0%18.6%38.2
Gilchrist County320k9.7%17.0%55.5
Glades County313k11.7%19.7%41.1
Gulf County316k9.1%15.5%44.1
Hamilton County313k12.1%20.6%58.8
Hardee County326k9.5%17.6%34.0
Hendry County343k8.5%17.4%37.1
Hernando County3213k9.1%14.3%42.2
Highlands County3108k11.0%14.3%33.7
Holmes County320k10.9%19.2%57.2
Indian River County3170k8.8%11.5%33.5
Jackson County349k10.3%19.0%48.5
Jefferson County315k10.3%17.1%37.0
Lafayette County38,07810.6%19.3%43.3
Lake County3424k8.0%12.3%33.2
Lee County3835k8.2%11.9%27.9
Levy County347k11.0%17.8%55.0
Liberty County37,70610.0%19.3%45.5
Madison County319k11.1%18.8%48.6
Manatee County3441k8.3%12.4%27.9
Martin County3163k8.5%11.4%27.8
Monroe County381k7.2%12.0%26.6
Nassau County3102k7.6%12.4%36.8
Okaloosa County3218k6.6%12.8%39.8
Okeechobee County341k10.5%18.2%52.1
Orange County31.5M5.5%11.9%25.7
Osceola County3438k5.5%11.8%29.0
Palm Beach County31.5M7.1%11.2%23.2
Pasco County3633k7.8%13.5%38.8
Pinellas County3962k8.1%12.2%33.4
Putnam County376k13.0%21.0%55.4
Santa Rosa County3203k6.8%13.4%43.0
Sarasota County3469k8.4%10.5%29.2
Seminole County3484k5.6%10.8%29.0
St. Johns County3320k6.0%10.1%25.7
St. Lucie County3374k8.3%13.5%32.4
Sumter County3152k10.1%9.9%28.4
Suwannee County346k10.5%17.9%52.7
Taylor County322k11.5%19.2%60.0
Volusia County3590k8.4%13.7%38.9
Wakulla County336k7.8%15.3%49.1
Walton County386k7.7%13.8%39.3
Washington County326k10.7%19.5%62.8

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Other states

Radon zones elsewhere