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Radon Levels in Hamilton County, Florida

EPA puts Hamilton County in Zone 3, its lowest radon zone, and only 1 radon test from it is on file with CDC (2021). 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

  • Highest bordering

    6.7%

    Columbia County

    Columbia
    6.7%

    1 of 5 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    6.7%

    Columbia County, 27 miles

    Columbia
    6.7%
    Florida
    22.7%

    Share at 4+ pCi/L, 30 tests, 2008 to 2017

  • Ground above low

    None

    7.1 pts below Florida

    Hamilton
    0.0%
    Florida
    7.1%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Hamilton
    1
    Needed
    30

    2021

  • 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

Read a result for Hamilton County

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Hamilton County, At a glance

Hamilton County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Hamilton 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Hamilton County, 2021

CDC holds 1 reported test for Hamilton County in 2021, a result of 0.4 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Hamilton County beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Hamilton County over 2021, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.

Measured: CDC tracking data. Measured data period: 2021.

How to read these figures

Hamilton County, Compared

Hamilton County radon figures, compared

Calculated by Radon411

CDC's largest figure for Hamilton County rests on 1 test in 2021, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 0.4 pCi/L, with a middle value of 0.4 pCi/L.

Columbia County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 6.7% of its tests at or above 4 pCi/L. Farther out, Jefferson County (57 miles away) at 6.1%, Alachua County (67 miles away) at 35.2% and Nassau County (69 miles away) at 2.0% have figures too. Pooled across 62 Florida counties, 22.7% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Marion County reported the highest share (42.9%) and St. Lucie County the lowest (0.0%). EPA's 1993 map puts Hamilton County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.

Florida, the United States and the counties around Hamilton County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
Florida, pooled62 counties, pooled53,79422.7%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Marion Countyhighest in the state90342.9%3.3 pCi/L
St. Lucie Countylowest in the state460.0%0.1 pCi/L
Madison County, FLborders it812.5%0.6 pCi/L
Columbia County, FLborders it306.7%1.0 pCi/L
Suwannee County, FLborders it210.0%1.1 pCi/L
Lowndes County, GAborders it90.0%1.1 pCi/L
The nearest Florida counties to Hamilton County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Columbia County27 mi306.7%1.0 pCi/L
Jefferson County57 mi496.1%1.4 pCi/L
Alachua County67 mi2,16235.2%2.9 pCi/L
Nassau County69 mi502.0%0.7 pCi/L
Duval County77 mi4801.3%0.5 pCi/L
Leon County79 mi5,14823.3%2.2 pCi/L
Wakulla County90 mi798.9%1.5 pCi/L
Putnam County95 mi951.1%0.1 pCi/L

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

Hamilton County, Geology

The ground under Hamilton County

Predicted

USGS's geologic map puts all of Hamilton County's mapped land in one class: low radon potential. The map puts 85.1% of Hamilton County in the area it calls Northern Highland and 14.4% in Gulf/Atlantic Lowland and Central Highland. USGS gives both a radon index of 6, in the low band (5 to 8).

USGS's geologic areas under Hamilton County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Northern HighlandSand, silt, clay, gravelLow685.1%
Gulf/Atlantic Lowland and Central Highlandsand, silt, clay, gravelLow614.4%

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

Hamilton County beside the ground around it

Across Florida 7.1% of the land is rated moderate; none of Hamilton County's is. Of the 5 counties that border it, 1 has more moderate-potential ground, Columbia County the most at 22.7%.

Share of land by USGS radon potential: Hamilton County, the 5 counties bordering it and Florida
AreaEPA zoneLow potentialModerate potentialHigh potential
Hamilton CountyZone 3100%NoneNone
Echols County, GAZone 3100%NoneNone
Suwannee CountyZone 3100%NoneNone
Columbia CountyZone 277.3%22.7%None
Lowndes County, GAZone 3100%NoneNone
Madison CountyZone 3100%NoneNone
Florida67 counties, pooled by land areaVaries89.7%7.1%None

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

Local help

Hamilton County, Local resources

Radon testing and mitigation in Hamilton County

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

Hamilton County, Questions

Questions about radon in Hamilton County

Are radon levels high in Hamilton County?

In 2021, 0.0% of the radon tests reported to CDC for Hamilton County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.4 pCi/L. Columbia County, the one bordering county with a figure over the 2008 to 2017 laboratory totals, reported 6.7% of its tests at or above 4 pCi/L.

Which counties border Hamilton County?

Hamilton County borders 5 counties: Echols County, GA, Suwannee County, FL, Columbia County, FL, Lowndes County, GA and Madison County, FL.

Products

Hamilton County, Products

Testing a home in Hamilton County

No CDC figure names Hamilton County; the nearest county with one, Columbia County (27 miles away), reported 6.7% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. 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 Hamilton County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Hamilton County homes, compared

Explore

Hamilton County, Bordering counties

Counties bordering Hamilton County

Calculated by Radon411

Hamilton County, Cities and towns

Cities and towns in Hamilton County

The Census Bureau estimates 14,180 residents in Hamilton County for July 1, 2025, 447 more than in 2020 (+3.3%). That works out to 28 people per square mile of land. Its largest town, Jasper, has 3,444 residents, 24.3% of the total. Together its 3 incorporated places hold 35.0% of those residents; the other 65.0% live outside any of them. Reported testing is thin here: 1 test over 2021, or 0.1 for every 1,000 residents (2025 estimate), where Florida as a whole comes to 0.7.

From Jasper to White Springs, CDC publishes no figure by town: each reads Hamilton County's.

The cities and towns in Hamilton County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Jasper3,444+2.9%24.3%
Jennings766+2.4%5.4%
White Springs759+2.8%5.4%

3 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).

Hamilton County, Homes

Homes in Hamilton County

Mobile homes are 40% of Hamilton County's 5,638 homes and detached houses 52%, against 55% across Florida. Half of its homes were built before 1989, close to Florida's 1988: 14% date from before 1960 and 26% 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 Hamilton County, Florida, 2019 to 2023
HomesHamilton CountyFlorida
Housing units5,63810,082,356
Detached houses52%55%
In buildings of 5 or more1%25%
Mobile homes40%8%
Built before 196014%10%
Built since 200026%30%
Middle year built19891988
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.