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Radon Levels in Alachua County, Florida

EPA puts Alachua County in Zone 2, its middle radon zone, and 21.4% of its 659 reported radon tests (2023) were at or above 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

    21.4%

    2.9 pts above FL

    Alachua
    21.4%
    Florida
    18.5%

    659 tests, 2023

  • Median result

    2.4pCi/L

    Below action level

    Alachua
    2.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2023

  • Tests reported

    659

    10th of 30 by tests

    Alachua
    659
    Broward
    2,165

    Reported to CDC before any fix, 2023

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Florida

    6 of 30

    Top quarter

    Alachua
    21.4%
    Marion
    44.5%

    By share, of 30 with 30+ tests

Read a result for Alachua County

Starts at Alachua County's median, 2.4 pCi/L

2.4pCi/L

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

EPA’s reading of 2.4 pCi/L

Between 2 and 4 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Alachua County's median reported result, 2023.

Interpret this readingWhat a fix costs

The data

Alachua County, At a glance

Alachua County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Alachua County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Low across 53% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Alachua County, 2023

Share of reported tests at or above 4 pCi/L, by year, Alachua County
Share of reported tests at or above 4 pCi/L, by year, Alachua County
YearShare of reported tests at or above 4 pCi/L
201439.4%
201536.5%
201635.2%
201727.1%
201821.5%
201921.8%
202033.7%
202121.5%
202219.5%
202321.4%

2023: 21.4%. Across these years the share ran from 19.5% to 39.4%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 659 tests reported to CDC for Alachua 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

Alachua County, Compared

Alachua County radon figures, compared

Calculated by Radon411

Alachua County's 659 reported tests in 2023 had a middle value of 2.4 pCi/L and a maximum of 27.3 pCi/L, and 21.4% reached 4 pCi/L. Florida as a whole (49 Florida counties, pooled) comes to 18.5%: 2.9 points lower than here.

Among its state's counties it ranks 6th of 30 Florida counties with 30 or more tests for the same period. Statewide for the same period, Marion County reported the highest share (44.5%) and Clay County the lowest (0.0%).

Below the action level, 241 tests (36.6%) came in under 2 pCi/L, against 57.3% statewide, and 277 tests (42.0%) fell between 2 and 4, against 24.2% statewide. The busiest year on file was 2022, with 1,719 tests reported; the quietest, 2015, had 301.

EPA's 1993 zone map puts Alachua County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 53% of the county's land low radon potential.

Marion County, the one bordering county with a figure for the same period, reported 44.5%. Over 10 years of annual figures the share fell 18.0 points, from 39.4% in 2014 to 21.4% in 2023; its peak was 39.4% in 2014.

CDC also counts 68 tests taken after mitigation in Alachua County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Alachua County against Florida2014 to 2023, years with 30 or more tests: Alachua County 39.4% to 21.4%, the state's pooled share 18.5% in 2023.
Alachua CountyFlorida, pooled
Share of reported tests at or above 4 pCi/L by year, Alachua County against Florida: data table
YearTestsAlachua County, at or above 4 pCi/LFlorida, pooled
201446439.4%25.7%
201530136.5%26.5%
201640135.2%24.3%
201756127.1%21.7%
201844721.5%23.5%
201968921.8%29.6%
202061833.7%23.2%
202149721.5%15.4%
20221,71919.5%22.8%
202365921.4%18.5%
Alachua County against Florida, the United States and nearby counties, 2023
AreaTestsAt or above 4 pCi/LMedianDifference from Alachua County
Alachua County65921.4%2.4 pCi/LThis county
Florida, pooled49 counties, pooled16,58918.5%Not pooled−2.9 points
United States, pooled642 counties, pooled128,74033.4%Not pooled+12.0 points
Palm Beach Countyhighest in the state1,52640.1%3.0 pCi/L+18.7 points
Clay Countylowest in the state360.0%1.0 pCi/L−21.4 points
Marion County, FLborders it18244.5%3.6 pCi/L+23.1 points
Levy County, FLborders it110.0%1.7 pCi/L−21.4 points
Columbia County, FLborders it30.0%1.4 pCi/L−21.4 points
Putnam County, FLborders it100.0%0.9 pCi/L−21.4 points
Where Alachua County's reported results fell, 2023, beside Florida and the United States
ResultAlachua County testsAlachua County shareFlorida shareU.S. shareAgainst Florida
Under 2 pCi/L24136.6%57.3%41.4%−20.7 points
2 to 4 pCi/L27742.0%24.2%25.2%+17.8 points
4 pCi/L and above14121.4%18.5%33.4%+2.9 points
Alachua 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
Marion County1 of 3018244.5%3.6 pCi/L
Palm Beach County2 of 301,52640.1%3.0 pCi/L
Miami-Dade County3 of 301,91939.6%2.8 pCi/L
Charlotte County4 of 309131.9%2.9 pCi/L
Collier County5 of 301,60722.7%2.3 pCi/L
Alachua County6 of 3065921.4%2.4 pCi/L
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
Alachua County radon tests by year, against Florida's pooled share
YearTestsAt or above 4 pCi/LMedianHighestFlorida, pooledChange from the row before
202365921.4%2.4 pCi/L27.3 pCi/L18.5%+1.9 points
20221,71919.5%1.9 pCi/L57.3 pCi/L22.8%−2.0 points
202149721.5%1.8 pCi/L77.2 pCi/L15.4%−12.2 points
202061833.7%2.5 pCi/L193.0 pCi/L23.2%+11.9 points
201968921.8%2.1 pCi/L111.7 pCi/L29.6%+0.3 points
201844721.5%2.2 pCi/L45.2 pCi/L23.5%−5.6 points
201756127.1%2.3 pCi/L54.2 pCi/L21.7%−8.1 points
201640135.2%2.6 pCi/L97.2 pCi/L24.3%−1.3 points
201530136.5%2.9 pCi/L78.7 pCi/L26.5%−2.9 points
201446439.4%3.3 pCi/L75.7 pCi/L25.7%First on file

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

Alachua County, Geology

The ground under Alachua County

Predicted

USGS's geologic map splits Alachua County: 52.7% of its land is low radon potential and 47.3% moderate. The map puts 52.7% of Alachua County in the area it calls Gulf/Atlantic Lowland and Central Highland and 47.3% 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 Alachua County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Gulf/Atlantic Lowland and Central Highlandsand, silt, clay, gravelLow652.7%
Highland Anomalous areasPhosphate deposits.Moderate1147.3%

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

Alachua County beside the ground around it

Alachua County has more moderate-potential ground than Florida as a whole: 47.3% of its land against 7.1%. Of the 7 counties that border it, 1 has more moderate-potential ground, Union County the most at 63.8%.

Share of land by USGS radon potential: Alachua County, the 7 counties bordering it and Florida
AreaEPA zoneLow potentialModerate potentialHigh potential
Alachua CountyZone 252.7%47.3%None
Bradford CountyZone 377.8%22.2%None
Union CountyZone 236.2%63.8%None
Gilchrist CountyZone 396.2%3.8%None
Putnam CountyZone 3100%NoneNone
Marion CountyZone 268.6%31.4%None
Levy CountyZone 384.6%12.3%None
Columbia CountyZone 277.3%22.7%None
Florida67 counties, pooled by land areaVaries89.7%7.1%None

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

Local help

Alachua County, Local resources

Radon testing and mitigation in Alachua County

Listed radon businesses with an address in Alachua County:

Listed radon professionals by town: Gainesville, Micanopy

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

Alachua County, Questions

Questions about radon in Alachua County

Are radon levels high in Alachua County?

In 2023, 21.4% of the radon tests reported to CDC for Alachua County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.4 pCi/L. Of 30 Florida counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 18.5%.

Which counties border Alachua County?

Alachua County borders 7 counties: Bradford County, Union County, Gilchrist County, Putnam County, Marion County, Levy County and Columbia County.

Products

Alachua County, Products

Testing a home in Alachua County

In Alachua County, 21.4% of 659 tests reported to CDC in 2023 reached 4 pCi/L, against 18.5% pooled across Florida. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Alachua County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Alachua County homes, compared

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Alachua County, Bordering counties

Counties bordering Alachua County

Calculated by Radon411

Alachua County, Cities and towns

Cities and towns in Alachua County

The Census Bureau estimates 290,028 residents in Alachua County for July 1, 2025, 10,261 more than in 2020 (+3.7%). That works out to 331 people per square mile of land. Gainesville alone is home to 148,671 of them, 51.3% of the total. Together its 9 incorporated places hold 61.8% of those residents; the other 38.2% live outside any of them. Testing is reported here more often than across the state: CDC's 659 reported tests for 2023 come to 2.3 for every 1,000 residents (2025 estimate), against 0.7 for Florida.

From Gainesville to La Crosse, CDC publishes no figure by town: each reads Alachua County's.

The cities and towns in Alachua County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Gainesville148,671+4.5%51.3%
Alachua10,612+0.4%3.7%
Newberry8,618+16.8%3.0%
High Springs6,762+8.2%2.3%
Hawthorne1,505+1.4%0.5%
Archer1,159+1.5%0.4%
Waldo814−3.7%0.3%
Micanopy653+1.6%0.2%
La Crosse323+1.9%0.1%

9 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).

Alachua County, Homes

Homes in Alachua County

Fewer than six in ten of Alachua County's 125,702 homes are detached houses (51%, against 55% across Florida); the rest are attached, in shared buildings or mobile. Half of its homes were built before 1987, close to Florida's 1988: 10% date from before 1960 and 28% from 2000 or later. 54% 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 Alachua County, Florida, 2019 to 2023
HomesAlachua CountyFlorida
Housing units125,70210,082,356
Detached houses51%55%
In buildings of 5 or more29%25%
Mobile homes7%8%
Built before 196010%10%
Built since 200028%30%
Middle year built19871988
Owner-occupied54%67%

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