Is radon high in Florida?

Florida's population-weighted predicted basement average is 1.3 pCi/L, about 31% below the US average of 1.8. 0 of its 67 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 0 are in the 2-4 "consider fixing" range and 67 are below 2. 0% of Florida ZIP codes are predicted at 4 or higher.

Which Florida county has the highest radon?

Jefferson County has the highest predicted basement average in Florida at 1.6 pCi/L (EPA Zone 3). The lowest is Pinellas County at 1.1 pCi/L. These are area figures; individual homes in any county can test far higher.

How many EPA Zone 1 counties are in Florida?

0 of Florida's 67 counties (0%) are EPA Zone 1 (highest potential), 9 are Zone 2 and 58 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.

Should I test for radon in Florida?

Yes. Even though Florida's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 0% of Florida ZIP codes are still predicted at 2 pCi/L or higher.

Radon levels in Florida: Low

Name: Radon levels by county for Florida
Creator: RadonGrade
License: https://creativecommons.org/licenses/by/4.0/

The model predicts a population-weighted basement average of 1.3 pCi/L (model estimate) across Florida's 67 counties - about 31% below the US average of 1.8 pCi/L. Above-ground floors average 1.0 pCi/L.

Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

0 / 67

EPA Zone 1 counties (0%)

9 / 58

Zone 2 / Zone 3 counties

counties predicted ≥ 4 pCi/L

of ZIP codes predicted ≥ 4 pCi/L

Test Florida once anyway - radon varies house to house

The predicted basement average here is 1.3 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

Get a short-term test kit →Or track it with a continuous monitor

Monitor link goes to the Airthings store - use code RADONGRADE-10OFF at checkout for 10% off any Airthings monitor.

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What the data says about radon in Florida

On the EPA's 1993 radon zone map, 0 of Florida's 67 counties are EPA Zone 1 (0%), 9 are Zone 2 and 58 are Zone 3. Most counties fall in Zone 3, the EPA's lowest-potential class (predicted screening average under 2 pCi/L). That classification has not been revised since 1993; it describes counties, not homes, and elevated readings turn up in Zone 3 counties every year.

Florida models out at 1.3 pCi/L predicted basement average (low; 31% below the US average of 1.8). Of the 67 counties with predictions, 0 are predicted at or above 4 pCi/L, 0 in the 2-4 band and 67 below 2. The county range is narrow: from Pinellas County at 1.14 to Jefferson County at 1.58 pCi/L, a spread of only 0.44.

At ZIP-code resolution, 0% of Florida ZIPs are predicted at 4 pCi/L or higher in the basement and 0% at 2 or higher - below the national shares of 4.2% and 48.7%. No ZIP in the state is predicted above 4 on average - but averages hide individual homes, which is why the EPA still asks everyone to test.

Florida counties by predicted radon

Sorted highest to lowest predicted basement average (model estimate). 67 counties.

County	Predicted basement	Upstairs	Grade	EPA zone	ZIPs
Jefferson County	1.6 pCi/L	1.1	Low	EPA Zone 3	1
Wakulla County	1.5 pCi/L	1.1	Low	EPA Zone 3	4
Columbia County	1.5 pCi/L	1.1	Low	EPA Zone 2	6
Gadsden County	1.5 pCi/L	1.1	Low	EPA Zone 3	6
Madison County	1.5 pCi/L	1.0	Low	EPA Zone 3	4
Washington County	1.5 pCi/L	0.9	Low	EPA Zone 3	4
Alachua County	1.5 pCi/L	1.5	Low	EPA Zone 2	17
Marion County	1.5 pCi/L	1.4	Low	EPA Zone 2	23
Taylor County	1.5 pCi/L	1.0	Low	EPA Zone 3	4
Union County	1.5 pCi/L	0.9	Low	EPA Zone 2	2
Holmes County	1.4 pCi/L	1.0	Low	EPA Zone 3	2
Nassau County	1.4 pCi/L	0.8	Low	EPA Zone 3	5
Santa Rosa County	1.4 pCi/L	0.9	Low	EPA Zone 3	7
Baker County	1.4 pCi/L	0.8	Low	EPA Zone 3	3
Levy County	1.4 pCi/L	1.1	Low	EPA Zone 3	7
Calhoun County	1.4 pCi/L	0.9	Low	EPA Zone 3	4
Gilchrist County	1.4 pCi/L	1.1	Low	EPA Zone 3	2
Jackson County	1.4 pCi/L	1.0	Low	EPA Zone 3	11
Citrus County	1.4 pCi/L	1.1	Low	EPA Zone 2	13
Hamilton County	1.4 pCi/L	0.9	Low	EPA Zone 3	2
Lee County	1.4 pCi/L	1.5	Low	EPA Zone 3	33
Charlotte County	1.4 pCi/L	1.4	Low	EPA Zone 3	13
Lafayette County	1.4 pCi/L	1.1	Low	EPA Zone 3	2
Sarasota County	1.4 pCi/L	1.4	Low	EPA Zone 3	24
Suwannee County	1.4 pCi/L	1.0	Low	EPA Zone 3	5
Walton County	1.4 pCi/L	0.8	Low	EPA Zone 3	6
Clay County	1.4 pCi/L	0.8	Low	EPA Zone 3	6
Dixie County	1.4 pCi/L	1.0	Low	EPA Zone 3	4
St. Johns County	1.4 pCi/L	0.8	Low	EPA Zone 3	10
Leon County	1.3 pCi/L	1.2	Low	EPA Zone 2	10
Collier County	1.3 pCi/L	1.5	Low	EPA Zone 3	19
Manatee County	1.3 pCi/L	1.2	Low	EPA Zone 3	17
Polk County	1.3 pCi/L	1.0	Low	EPA Zone 2	30
Flagler County	1.3 pCi/L	0.7	Low	EPA Zone 3	4
Gulf County	1.3 pCi/L	0.8	Low	EPA Zone 3	2
DeSoto County	1.3 pCi/L	0.8	Low	EPA Zone 3	2
Franklin County	1.3 pCi/L	0.8	Low	EPA Zone 3	3
Hardee County	1.3 pCi/L	1.0	Low	EPA Zone 3	4
Okaloosa County	1.3 pCi/L	0.9	Low	EPA Zone 3	13
St. Lucie County	1.3 pCi/L	0.9	Low	EPA Zone 3	14
Bradford County	1.3 pCi/L	0.8	Low	EPA Zone 3	4
Brevard County	1.3 pCi/L	0.8	Low	EPA Zone 3	27
Escambia County	1.3 pCi/L	0.8	Low	EPA Zone 3	16
Lake County	1.3 pCi/L	0.8	Low	EPA Zone 3	23
Liberty County	1.3 pCi/L	0.8	Low	EPA Zone 3	2
Martin County	1.3 pCi/L	1.1	Low	EPA Zone 3	9
Bay County	1.3 pCi/L	0.7	Low	EPA Zone 3	11
Hernando County	1.3 pCi/L	0.9	Low	EPA Zone 3	9
Palm Beach County	1.3 pCi/L	1.1	Low	EPA Zone 3	50
Sumter County	1.3 pCi/L	1.0	Low	EPA Zone 3	8
Pasco County	1.3 pCi/L	0.9	Low	EPA Zone 3	22
Putnam County	1.3 pCi/L	0.8	Low	EPA Zone 3	11
Indian River County	1.3 pCi/L	0.9	Low	EPA Zone 3	8
Osceola County	1.2 pCi/L	0.7	Low	EPA Zone 3	12
Seminole County	1.2 pCi/L	0.8	Low	EPA Zone 3	14
Hillsborough County	1.2 pCi/L	0.9	Low	EPA Zone 2	51
Volusia County	1.2 pCi/L	0.7	Low	EPA Zone 3	26
Glades County	1.2 pCi/L	1.1	Low	EPA Zone 3	2
Hendry County	1.2 pCi/L	1.0	Low	EPA Zone 3	3
Okeechobee County	1.2 pCi/L	0.7	Low	EPA Zone 3	1
Duval County	1.2 pCi/L	0.6	Low	EPA Zone 3	32
Monroe County	1.2 pCi/L	1.1	Low	EPA Zone 3	7
Broward County	1.2 pCi/L	1.0	Low	EPA Zone 3	53
Orange County	1.2 pCi/L	0.7	Low	EPA Zone 3	41
Highlands County	1.2 pCi/L	0.8	Low	EPA Zone 3	8
Miami-Dade County	1.1 pCi/L	1.1	Low	EPA Zone 2	77
Pinellas County	1.1 pCi/L	0.8	Low	EPA Zone 3	47

Radon levels in Florida cities

The 89 most-populous Florida places among the 1,000 largest US cities (Census incorporated places and CDPs), by population. City figures are ZIP-land-weighted means of the model's ZIP predictions (model estimate).

City	Population	Predicted basement	Upstairs	Grade	ZIPs ≥ 4
Jacksonville	985,843	1.3 pCi/L	0.7	Low	0%
Miami	455,924	1.0 pCi/L	1.1	Low	0%
Tampa	403,364	1.2 pCi/L	0.9	Low	0%
Orlando	320,742	1.2 pCi/L	0.7	Low	0%
St. Petersburg	263,553	1.2 pCi/L	0.9	Low	0%
Port St. Lucie	245,021	1.4 pCi/L	1.0	Low	0%
Cape Coral	224,455	1.4 pCi/L	1.6	Low	0%
Hialeah	221,300	1.1 pCi/L	1.0	Low	0%
Tallahassee	202,221	1.4 pCi/L	1.2	Low	0%
Fort Lauderdale	184,255	1.2 pCi/L	0.9	Low	0%
Pembroke Pines	171,119	1.3 pCi/L	1.1	Low	0%
Hollywood	153,859	1.1 pCi/L	0.9	Low	0%
Gainesville	145,812	1.5 pCi/L	1.5	Low	0%
Miramar	138,319	1.3 pCi/L	1.1	Low	0%
Palm Bay	135,566	1.3 pCi/L	0.8	Low	0%
Coral Springs	134,906	1.3 pCi/L	1.3	Low	0%
West Palm Beach	124,130	1.3 pCi/L	1.2	Low	0%
Lakeland	122,264	1.4 pCi/L	1.2	Low	0%
Clearwater	116,850	1.1 pCi/L	0.8	Low	0%
Pompano Beach	113,619	1.1 pCi/L	0.8	Low	0%
Miami Gardens	110,717	1.1 pCi/L	0.8	Low	0%
Davie	107,799	1.3 pCi/L	1.2	Low	0%
Brandon	103,483	1.3 pCi/L	1.0	Low	0%
Palm Coast	102,113	1.3 pCi/L	0.7	Low	0%
Boca Raton	99,974	1.2 pCi/L	1.0	Low	0%
Deltona	98,739	1.2 pCi/L	0.7	Low	0%
Spring Hill	98,621	1.2 pCi/L	0.8	Low	0%
Fort Myers	97,372	1.4 pCi/L	1.4	Low	0%
Sunrise	96,808	1.2 pCi/L	1.1	Low	0%
Plantation	96,548	1.2 pCi/L	1.1	Low	0%
North Port	88,934	1.4 pCi/L	1.5	Low	0%
Deerfield Beach	87,325	1.0 pCi/L	0.7	Low	0%
Melbourne	86,960	1.3 pCi/L	0.8	Low	0%
Lehigh Acres	86,784	1.3 pCi/L	1.2	Low	0%
Daytona Beach	82,485	1.3 pCi/L	0.7	Low	0%
Largo	82,248	1.1 pCi/L	0.8	Low	0%
Homestead	81,659	1.3 pCi/L	1.1	Low	0%
Kissimmee	81,269	1.2 pCi/L	0.6	Low	0%
Boynton Beach	81,267	1.2 pCi/L	0.9	Low	0%
Miami Beach	79,607	1.0 pCi/L	1.0	Low	0%
Doral	79,359	1.2 pCi/L	1.0	Low	0%
Town 'n' Country	78,442	1.1 pCi/L	0.7	Low	0%
Alafaya	78,113	1.3 pCi/L	0.7	Low	0%
Kendall	75,371	1.3 pCi/L	1.2	Low	0%
Lauderhill	73,974	1.1 pCi/L	0.9	Low	0%
Tamarac	72,372	1.2 pCi/L	0.9	Low	0%
Riverview	71,050	1.3 pCi/L	0.9	Low	0%
Ocala	68,426	1.5 pCi/L	1.9	Low	0%
Weston	68,181	1.3 pCi/L	1.2	Low	0%
Delray Beach	67,536	1.0 pCi/L	0.8	Low	0%
St. Cloud	66,448	1.3 pCi/L	0.7	Low	0%
Port Orange	65,966	1.3 pCi/L	0.8	Low	0%
Sanford	65,394	1.2 pCi/L	0.7	Low	0%
Wellington	61,634	1.5 pCi/L	1.6	Low	0%
Jupiter	61,291	1.4 pCi/L	1.6	Low	0%
Palm Beach Gardens	61,146	1.4 pCi/L	1.4	Low	0%
Pine Hills	60,076	1.1 pCi/L	0.8	Low	0%
Fountainebleau	59,764	1.0 pCi/L	1.0	Low	0%
Apopka	59,113	1.4 pCi/L	0.9	Low	0%
North Miami	59,008	1.0 pCi/L	0.9	Low	0%
Margate	58,593	1.2 pCi/L	1.0	Low	0%
Coconut Creek	57,694	1.2 pCi/L	1.1	Low	0%
Sarasota	57,602	1.2 pCi/L	1.1	Low	0%
Palm Harbor	57,439	1.1 pCi/L	0.8	Low	0%
Winter Haven	57,109	1.2 pCi/L	0.7	Low	0%
Bradenton	57,076	1.3 pCi/L	1.1	Low	0%
Bonita Springs	56,229	1.6 pCi/L	2.1	Low	0%
Kendale Lakes	56,148	1.3 pCi/L	1.1	Low	0%
Tamiami	55,271	1.3 pCi/L	1.1	Low	0%
Port Charlotte	54,392	1.3 pCi/L	1.4	Low	0%
Pensacola	53,724	1.3 pCi/L	0.8	Low	0%
Pinellas Park	53,456	1.3 pCi/L	1.2	Low	0%
Poinciana	53,193	1.3 pCi/L	0.7	Low	0%
The Villages	51,442	1.2 pCi/L	0.9	Low	0%
The Hammocks	51,003	1.3 pCi/L	1.2	Low	0%
Titusville	49,680	1.3 pCi/L	0.7	Low	0%
Fort Pierce	49,374	1.2 pCi/L	0.8	Low	0%
Ocoee	49,261	1.2 pCi/L	0.8	Low	0%
Clermont	48,621	1.4 pCi/L	0.9	Low	0%
Coral Gables	48,353	1.2 pCi/L	1.1	Low	0%
Winter Garden	47,294	1.3 pCi/L	0.8	Low	0%
Country Club	47,105	1.3 pCi/L	2.3	Low	0%
Altamonte Springs	45,257	1.1 pCi/L	0.9	Low	0%
North Lauderdale	44,784	1.2 pCi/L	1.1	Low	0%
Ormond Beach	44,277	1.2 pCi/L	0.6	Low	0%
Oakland Park	44,105	1.2 pCi/L	0.9	Low	0%
Greenacres	44,103	1.4 pCi/L	1.2	Low	0%
Wesley Chapel	44,092	1.4 pCi/L	0.8	Low	0%
Cutler Bay	43,762	1.3 pCi/L	1.0	Low	0%

Highest-radon ZIP codes in Florida

The 10 Florida ZIP codes with the highest predicted basement average (model estimate), out of 922 modeled. A ZIP average is still an area figure - neighboring homes routinely test several pCi/L apart.

ZIP	County	Predicted basement	Upstairs	Grade
32669	Alachua County	1.8 pCi/L	1.6	Low
33437	Palm Beach County	1.7 pCi/L	1.3	Low
34471	Marion County	1.7 pCi/L	2.7	Low
32686	Marion County	1.7 pCi/L	1.7	Low
32615	Alachua County	1.7 pCi/L	2.0	Low
34480	Marion County	1.7 pCi/L	1.7	Low
33525	Pasco County	1.6 pCi/L	1.4	Low
32643	Alachua County	1.6 pCi/L	1.4	Low
32025	Columbia County	1.6 pCi/L	1.3	Low
33860	Polk County	1.6 pCi/L	1.5	Low

Florida radon questions

Is radon high in Florida?: Florida's population-weighted predicted basement average is 1.3 pCi/L, about 31% below the US average of 1.8. 0 of its 67 modeled counties are predicted at or above the EPA action level of 4 pCi/L, 0 are in the 2-4 "consider fixing" range and 67 are below 2. 0% of Florida ZIP codes are predicted at 4 or higher.
Which Florida county has the highest radon?: Jefferson County has the highest predicted basement average in Florida at 1.6 pCi/L (EPA Zone 3). The lowest is Pinellas County at 1.1 pCi/L. These are area figures; individual homes in any county can test far higher.
How many EPA Zone 1 counties are in Florida?: 0 of Florida's 67 counties (0%) are EPA Zone 1 (highest potential), 9 are Zone 2 and 58 are Zone 3. The EPA zone map dates from 1993; the predicted values on this page come from a 2001-2021 model built on millions of actual tests, so the two can disagree for a given county.
Should I test for radon in Florida?: Yes. Even though Florida's predicted average is below 2 pCi/L, the EPA recommends every home be tested - radon varies house to house, and 0% of Florida ZIP codes are still predicted at 2 pCi/L or higher.

Florida radon program

Florida's radon program page is at www.floridahealth.gov and, when we checked it, offered a free radon test kit on request. The EPA also keeps a directory of every state radon contact: EPA state radon contacts page. Then read how to test and what mitigation costs.