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Radon Levels in Manatee County, Florida

EPA puts Manatee County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 11.0% of 263 (2023) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

  • Share at 4+ pCi/L

    11.0%

    7.5 pts below FL

    Manatee
    11.0%
    Florida
    18.5%

    263 tests, 2023

  • Median result

    1.5pCi/L

    Below action level

    Manatee
    1.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    263

    13th of 30 by tests

    Manatee
    263
    Broward
    2,165

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in Florida

    12 of 30

    Middle half

    Manatee
    11.0%
    Marion
    44.5%

    By share, of 30 with 30+ tests

Read a result for Manatee County

Starts at Manatee County's median, 1.5 pCi/L

1.5pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 1.5 pCi/L

Below 2 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Manatee County's median reported result, 2023.

The data

Manatee County, At a glance

Manatee County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Manatee County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

USGS geologic potential: Low across 87% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Manatee County, 2023

Share of reported tests at or above 4 pCi/L, by year, Manatee County
Share of reported tests at or above 4 pCi/L, by year, Manatee County
YearShare of reported tests at or above 4 pCi/L
201432.4%
201510.0%
20169.1%
201711.6%
201817.9%
20199.2%
20207.1%
20214.1%
202218.5%
202311.0%

2023: 11.0%. Across these years the share ran from 4.1% to 32.4%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 263 tests reported to CDC for Manatee County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).

How to read these figures

Manatee County, Compared

Manatee County radon figures, compared

Calculated by Radon411

Manatee County reports fewer high tests than Florida overall. 11.0% of its 263 tests in 2023 were at or above 4 pCi/L. That is 7.5 points below the 18.5% pooled from 49 Florida counties.

Ordered from highest share down, it comes 12th of 30 Florida counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 33.4%; Manatee County sits 22.4 points below it.

Next door, the shares run from 7.5% in Hillsborough County to 12.3% in Sarasota County, with Hillsborough County below Manatee County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 11.0% share point the same way here.

Half the tests came in under 1.5 pCi/L and half over it; the single highest reached 13.3 pCi/L. The rest split 65.8% under 2 pCi/L and 23.2% from 2 to 4 (Florida: 57.3% and 24.2%). Year by year, 2014 opened at 32.4% and 2023 closed at 11.0% (down 21.4 points), with 2014 the high at 32.4%.

The busiest year on file was 2022, with 1,263 tests reported; the quietest, 2016, had 22.

Share of reported tests at or above 4 pCi/L by year, Manatee County against Florida2014 to 2023, years with 30 or more tests: Manatee County 32.4% to 11.0%, the state's pooled share 18.5% in 2023.
Manatee CountyFlorida, pooled
Share of reported tests at or above 4 pCi/L by year, Manatee County against Florida: data table
YearTestsManatee County, at or above 4 pCi/LFlorida, pooled
201417332.4%25.7%
201512010.0%26.5%
20176911.6%21.7%
20185617.9%23.5%
2019989.2%29.6%
20201127.1%23.2%
20211214.1%15.4%
20221,26318.5%22.8%
202326311.0%18.5%
Manatee County against Florida, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Manatee County
Manatee County26311.0%1.5 pCi/LThis county
Florida, pooled49 counties, pooled16,58918.5%Not pooled+7.5 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+22.4 points
Marion Countyhighest in the state18244.5%3.6 pCi/L+33.5 points
Clay Countylowest in the state360.0%1.0 pCi/L−11.0 points
Sarasota County, FLborders it49612.3%1.6 pCi/L+1.3 points
Polk County, FLborders it13611.0%1.1 pCi/LLevel
Hillsborough County, FLborders it9847.5%0.9 pCi/L−3.5 points
DeSoto County, FLborders it10.0%1.7 pCi/L−11.0 points
Where Manatee County's reported results fell, 2023, beside Florida and the United States
ResultManatee County testsManatee County shareFlorida shareU.S. shareAgainst Florida
Under 2 pCi/L17365.8%57.3%41.4%+8.5 points
2 to 4 pCi/L6123.2%24.2%25.2%−1.0 points
4 pCi/L and above2911.0%18.5%33.4%−7.5 points
Manatee County ranked among the 30 Florida counties with 30 or more tests, by share at or above 4 pCi/L, 2023
CountyRankTestsAt or above 4 pCi/LMedian
Lee County7 of 301,22420.3%2.2 pCi/L
Leon County8 of 301,19619.1%1.8 pCi/L
Gadsden County9 of 309614.6%1.3 pCi/L
Sarasota County10 of 3049612.3%1.6 pCi/L
Polk County11 of 3013611.0%1.1 pCi/L
Manatee County12 of 3026311.0%1.5 pCi/L
Orange County13 of 301,1079.5%0.9 pCi/L
Broward County14 of 302,1659.4%1.7 pCi/L
Hillsborough County15 of 309847.5%0.9 pCi/L
Duval County16 of 307926.2%0.4 pCi/L
Pinellas County17 of 305595.9%1.2 pCi/L
Manatee County radon tests by year, against Florida's pooled share
YearTestsAt or above 4 pCi/LMedianHighestFlorida, pooledChange from the row before
202326311.0%1.5 pCi/L13.3 pCi/L18.5%−7.5 points
20221,26318.5%1.7 pCi/L77.0 pCi/L22.8%+14.4 points
20211214.1%0.5 pCi/L10.8 pCi/L15.4%−3.0 points
20201127.1%1.1 pCi/L14.0 pCi/L23.2%−2.1 points
2019989.2%1.8 pCi/L15.5 pCi/L29.6%−8.7 points
20185617.9%1.9 pCi/L11.1 pCi/L23.5%+6.3 points
20176911.6%1.8 pCi/L8.6 pCi/L21.7%+2.5 points
2016229.1%2.3 pCi/L5.5 pCi/L24.3%−0.9 points
201512010.0%1.5 pCi/L10.7 pCi/L26.5%−22.4 points
201417332.4%3.3 pCi/L9.1 pCi/L25.7%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Manatee County, Geology

The ground under Manatee County

Predicted

Most of the ground under Manatee County is one class on USGS's geologic map: 86.6% of its land is low radon potential, with 6.9% moderate. The map puts 86.6% of Manatee County in the area it calls Gulf/Atlantic Lowland and Central Highland and 6.9% in Highland Anomalous areas. USGS gives the first a radon index of 6, in the low band (5 to 8), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Manatee County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Gulf/Atlantic Lowland and Central Highlandsand, silt, clay, gravelLow686.6%
Highland Anomalous areasPhosphate deposits.Moderate116.9%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Manatee County beside the ground around it

On moderate-potential ground Manatee County is close to Florida as a whole: 6.9% of its land against 7.1%. Of the 5 counties that border it, 3 have more moderate-potential ground, Hillsborough County the most at 41.4%.

Share of land by USGS radon potential: Manatee County, the 5 counties bordering it and Florida
AreaEPA zoneLow potentialModerate potentialHigh potential
Manatee CountyZone 386.6%6.9%None
Sarasota CountyZone 395.1%NoneNone
Hardee CountyZone 374.3%25.7%None
Hillsborough CountyZone 256.1%41.4%None
DeSoto CountyZone 399.9%NoneNone
Polk CountyZone 266.3%33.7%None
Florida67 counties, pooled by land areaVaries89.7%7.1%None

The map rates the ground, not the air in any home.

Local help

Manatee County, Local resources

Radon testing and mitigation in Manatee County

What it means

Manatee County, Questions

Questions about radon in Manatee County

Are radon levels high in Manatee County?

In 2023, 11.0% of the radon tests reported to CDC for Manatee County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of 30 Florida counties with 30 or more tests for the same period, 11 reported a higher share; pooled, the state comes to 18.5%.

Which counties border Manatee County?

Manatee County borders 5 counties: Sarasota County, Hardee County, Hillsborough County, DeSoto County and Polk County.

Products

Manatee County, Products

Testing a home in Manatee County

In Manatee County, 11.0% of 263 tests reported to CDC in 2023 reached 4 pCi/L, against 18.5% pooled across Florida. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Manatee County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Manatee County homes, compared

Explore

Manatee County, Bordering counties

Counties bordering Manatee County

Calculated by Radon411

Manatee County, Cities and towns

Cities and towns in Manatee County

Manatee County is growing: the Census Bureau puts it at 468,200 residents on July 1, 2025, up 16.6% from 401,622 in 2020. That works out to 630 people per square mile of land. No town dominates: Bradenton, the largest, has 58,014 residents, 12.4% of the total. CDC's 263 reported tests for 2023 work out to 0.6 per 1,000 residents (2025 estimate), close to Florida's 0.7.

From Bradenton to Bradenton Beach, CDC publishes no figure by town: each reads Manatee County's.

The cities and towns in Manatee County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Bradenton58,014+3.9%12.4%
Palmetto13,562+1.8%2.9%
Longboat Keyextends beyond Manatee County7,359−1.9%Counted whole
Holmes Beach3,027+0.5%0.6%
Anna Maria1,023+5.4%0.2%
Bradenton Beach921+1.5%0.2%

6 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Manatee County is counted whole, so it has no share.

Manatee County, Homes

Homes in Manatee County

Fewer than six in ten of Manatee County's 214,510 homes are detached houses (54%, against 55% across Florida); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1990, close to Florida's 1988: 9% date from before 1960 and 37% from 2000 or later. 75% of occupied homes are lived in by their owner (Florida: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Manatee County, Florida, 2019 to 2023
HomesManatee CountyFlorida
Housing units214,51010,082,356
Detached houses54%55%
In buildings of 5 or more19%25%
Mobile homes14%8%
Built before 19609%10%
Built since 200037%30%
Middle year built19901988
Owner-occupied75%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.