Skip to content
RADON411

Locations and reports

Radon Levels in Pinellas County, Florida

EPA puts Pinellas County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 5.9% of 559 (2023) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    5.9%

    12.6 pts below FL

    Pinellas
    5.9%
    Florida
    18.5%

    559 tests, 2023

  • Median result

    1.2pCi/L

    Below action level

    Pinellas
    1.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    559

    11th of 30 by tests

    Pinellas
    559
    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

    17 of 30

    Middle half

    Pinellas
    5.9%
    Marion
    44.5%

    By share, of 30 with 30+ tests

Read a result for Pinellas County

Starts at Pinellas County's median, 1.2 pCi/L

1.2pCi/L

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

EPA’s reading of 1.2 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. Pinellas County's median reported result, 2023.

Interpret this reading

The data

Pinellas County, At a glance

Pinellas County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Pinellas 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 84% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Pinellas County, 2023

Share of reported tests at or above 4 pCi/L, by year, Pinellas County
Share of reported tests at or above 4 pCi/L, by year, Pinellas County
YearShare of reported tests at or above 4 pCi/L
20148.2%
20158.4%
20162.5%
20170.0%
20182.3%
201912.8%
20203.1%
20211.5%
20221.2%
20235.9%

2023: 5.9%. Across these years the share ran from 0.0% to 12.8%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 559 tests reported to CDC for Pinellas 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

Pinellas County, Compared

Pinellas County radon figures, compared

Calculated by Radon411

Pinellas County reports fewer high tests than Florida overall. 5.9% of its 559 tests in 2023 were at or above 4 pCi/L. That is 12.6 points below the 18.5% pooled from 49 Florida counties.

Ordered from highest share down, it comes 17th 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%; Pinellas County sits 27.5 points below it.

Next door, the shares run from 0.6% in Pasco County to 7.5% in Hillsborough County, with Pasco County below Pinellas County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 5.9% share point the same way here.

Half the tests came in under 1.2 pCi/L and half over it; the single highest reached 10.4 pCi/L. The rest split 74.6% under 2 pCi/L and 19.5% from 2 to 4 (Florida: 57.3% and 24.2%). Year by year, 2014 opened at 8.2% and 2023 closed at 5.9% (down 2.3 points), with 2019 the high at 12.8%.

The busiest year on file was 2022, with 1,479 tests reported; the quietest, 2017, had 127.

Share of reported tests at or above 4 pCi/L by year, Pinellas County against Florida2014 to 2023, years with 30 or more tests: Pinellas County 8.2% to 5.9%, the state's pooled share 18.5% in 2023.
Pinellas CountyFlorida, pooled
Share of reported tests at or above 4 pCi/L by year, Pinellas County against Florida: data table
YearTestsPinellas County, at or above 4 pCi/LFlorida, pooled
20141828.2%25.7%
20154538.4%26.5%
20161632.5%24.3%
20171270.0%21.7%
20184842.3%23.5%
201918012.8%29.6%
20202863.1%23.2%
20214011.5%15.4%
20221,4791.2%22.8%
20235595.9%18.5%
Pinellas County against Florida, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Pinellas County
Pinellas County5595.9%1.2 pCi/LThis county
Florida, pooled49 counties, pooled16,58918.5%Not pooled+12.6 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+27.5 points
Marion Countyhighest in the state18244.5%3.6 pCi/L+38.6 points
Clay Countylowest in the state360.0%1.0 pCi/L−5.9 points
Hillsborough County, FLborders it9847.5%0.9 pCi/L+1.6 points
Pasco County, FLborders it1640.6%0.8 pCi/L−5.3 points
Where Pinellas County's reported results fell, 2023, beside Florida and the United States
ResultPinellas County testsPinellas County shareFlorida shareU.S. shareAgainst Florida
Under 2 pCi/L41774.6%57.3%41.4%+17.3 points
2 to 4 pCi/L10919.5%24.2%25.2%−4.7 points
4 pCi/L and above335.9%18.5%33.4%−12.6 points
Pinellas 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
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
Wakulla County18 of 30313.2%0.8 pCi/L
Seminole County19 of 301901.6%0.6 pCi/L
Osceola County20 of 30701.4%1.2 pCi/L
Volusia County21 of 301631.2%0.6 pCi/L
Pasco County22 of 301640.6%0.8 pCi/L
Pinellas County radon tests by year, against Florida's pooled share
YearTestsAt or above 4 pCi/LMedianHighestFlorida, pooledChange from the row before
20235595.9%1.2 pCi/L10.4 pCi/L18.5%+4.7 points
20221,4791.2%0.9 pCi/L6.2 pCi/L22.8%−0.3 points
20214011.5%0.4 pCi/L6.4 pCi/L15.4%−1.6 points
20202863.1%0.6 pCi/L7.3 pCi/L23.2%−9.7 points
201918012.8%1.4 pCi/L12.3 pCi/L29.6%+10.5 points
20184842.3%0.9 pCi/L11.5 pCi/L23.5%+2.3 points
20171270.0%0.8 pCi/L3.9 pCi/L21.7%−2.5 points
20161632.5%1.0 pCi/L7.0 pCi/L24.3%−5.9 points
20154538.4%1.4 pCi/L10.9 pCi/L26.5%+0.2 points
20141828.2%1.4 pCi/L8.0 pCi/L25.7%First on file

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

Pinellas County, Geology

The ground under Pinellas County

Predicted

USGS's geologic map puts all of Pinellas County's mapped land in one class: low radon potential. 84.1% of it lies in the area the map calls Gulf/Atlantic Lowland and Central Highland, to which USGS gives a radon index of 6, in the low band (5 to 8).

USGS's geologic areas under Pinellas County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Gulf/Atlantic Lowland and Central Highlandsand, silt, clay, gravelLow684.1%

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

Pinellas County beside the ground around it

Across Florida 7.1% of the land is rated moderate; none of Pinellas County's is. Every one of the 2 counties that border it has more moderate-potential ground, Hillsborough County the most at 41.4%.

Share of land by USGS radon potential: Pinellas County, the 2 counties bordering it and Florida
AreaEPA zoneLow potentialModerate potentialHigh potential
Pinellas CountyZone 384.1%NoneNone
Hillsborough CountyZone 256.1%41.4%None
Pasco CountyZone 376.2%23.0%None
Florida67 counties, pooled by land areaVaries89.7%7.1%None

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

Local help

Pinellas County, Local resources

Radon testing and mitigation in Pinellas County

Listed radon businesses with an address in Pinellas County:

Listed radon professionals by town: Clearwater

What Florida's program says
Phone
850-245-4288
Email
PHtoxicology@FLhealth.gov
Licensing of radon professionals
Florida Statutes require the certification of businesses and individuals providing radon services or any other radon related activity.

What it means

Pinellas County, Questions

Questions about radon in Pinellas County

Are radon levels high in Pinellas County?

In 2023, 5.9% of the radon tests reported to CDC for Pinellas County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.2 pCi/L. Of 30 Florida counties with 30 or more tests for the same period, 16 reported a higher share; pooled, the state comes to 18.5%.

Which counties border Pinellas County?

Pinellas County borders 2 counties: Hillsborough County and Pasco County.

Products

Pinellas County, Products

Testing a home in Pinellas County

In Pinellas County, 5.9% of 559 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 Pinellas County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Pinellas County homes, compared

Explore

Pinellas County, Bordering counties

Counties bordering Pinellas County

Calculated by Radon411

Pinellas County, Cities and towns

Cities and towns in Pinellas County

About 948,563 people live in Pinellas County by the Census Bureau's estimate for July 1, 2025, 11,242 fewer than in 2020 (−1.2%). Packed into its land, that is 3,466 people per square mile. Its largest town, St. Petersburg, has 264,033 residents, 27.8% of the total. Together its 24 incorporated places hold 71.8% of those residents; the other 28.2% live outside any of them. CDC's 559 reported tests for 2023 work out to 0.6 per 1,000 residents (2025 estimate), close to Florida's 0.7.

From St. Petersburg to Belleair Shore, CDC publishes no figure by town: each reads Pinellas County's.

The 12 largest cities and towns in Pinellas County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
St. Petersburg264,033+1.8%27.8%
Clearwater114,364−2.5%12.1%
Largo80,690−2.5%8.5%
Pinellas Park52,295−2.0%5.5%
Dunedin35,227−2.5%3.7%
Tarpon Springs25,602+1.9%2.7%
Seminole18,997−2.2%2.0%
Safety Harbor16,624−2.5%1.8%
Oldsmar14,521−2.6%1.5%
Gulfport11,404−3.1%1.2%
St. Pete Beach8,553−3.6%0.9%
Treasure Island6,397−2.6%0.7%
  • South Pasadena
  • Kenneth City
  • Belleair
  • Madeira Beach
  • Indian Rocks Beach
  • Belleair Bluffs
  • Redington Shores
  • Belleair Beach
  • North Redington Beach
  • Redington Beach
  • Indian Shores
  • Belleair Shore

24 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).

Pinellas County, Homes

Homes in Pinellas County

Pinellas County has 518,180 homes, and many share a building: 30% are in buildings of five or more, 48% are detached houses, against 55% across Florida. The homes are older than Florida's as a whole: half were built before 1976 (1988 for Florida), and 20% date from before 1960. 69% 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 Pinellas County, Florida, 2019 to 2023
HomesPinellas CountyFlorida
Housing units518,18010,082,356
Detached houses48%55%
In buildings of 5 or more30%25%
Mobile homes9%8%
Built before 196020%10%
Built since 200012%30%
Middle year built19761988
Owner-occupied69%67%

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