Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Madison County, Florida
EPA puts Madison County in Zone 3, its lowest radon zone, and only 5 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
1.1%
25.4 pts below FL
- Madison
- 1.1%
- Florida
- 26.5%
89 tests, 2015
Median result
0.4pCi/L
Below action level
- Madison
- 0.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2015
Tests reported
89
20th of 24 by tests
- Madison
- 89
- Collier
- 3,069
Reported to CDC before any fix, 2015
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Florida
18 of 24
Middle half
- Madison
- 1.1%
- Broward
- 56.3%
By share, of 24 with 30+ tests
Read a result for Madison County
Starts at Madison County's median, 0.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.4 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. Madison County's median reported result, 2015.
The data
Madison County, At a glance
Madison County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
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 Madison County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 1.1% |
| 2016 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
| 2023 | 20.0% |
2023: 20.0%. Across these years the share ran from 0.0% to 20.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 5 tests were reported to CDC for Madison County over 2023, 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. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Madison County, Compared
Madison County radon figures, compared
Calculated by Radon411Only 1 of 89 radon tests reported for Madison County in 2015 reached 4 pCi/L (1.1%). The median result, 0.4 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 7.1 pCi/L.
The newest figure, in 2023, counts only 5 tests (20.0% at or above 4 pCi/L), too few to compare, so this reading uses the 89-test figure.
Across 47 Florida counties pooled together, 26.5% of tests reached that level, so Madison County runs 25.4 points below its state. Against the national pool of 35.5%, the gap is 34.4 points lower. Its place in the state: 18th of 24 Florida counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 1.1% share point the same way here. Taylor County, the one bordering county with a figure for the same period, reported 0.0%.
Below the action level, 88 tests (98.9%) came in under 2 pCi/L, against 45.3% statewide, and 0 tests (0.0%) fell between 2 and 4, against 28.2% statewide. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2015, with 89 tests reported; the quietest, 2021, had 1.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Madison County, Geology
The ground under Madison County
PredictedUSGS's geologic map puts all of Madison County's mapped land in one class: low radon potential. The map puts 53.3% of Madison County in the area it calls Northern Highland and 46.4% in Gulf/Atlantic Lowland and Central Highland. USGS gives both a radon index of 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Northern Highland | Sand, silt, clay, gravel | Low | 6 | 53.3% |
| Gulf/Atlantic Lowland and Central Highland | sand, silt, clay, gravel | Low | 6 | 46.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Madison County beside the ground around it
Across Florida 7.1% of the land is rated moderate; none of Madison County's is. None of the 7 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Madison County, Local resources
Radon testing and mitigation in Madison County
- Florida’s Radon ProgramFlorida’s Radon Program, run by Florida Department of Health, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Florida.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Protect your family by requesting a FREE radon test kit.
- Compare kits
- Professionals in Florida77 professionals are listed in Florida.
What Florida's program says
- Phone
- 850-245-4288
- 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
Madison County, Questions
Questions about radon in Madison County
Are radon levels high in Madison County?
In 2023, 20.0% of the radon tests reported to CDC for Madison County, Florida were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.3 pCi/L. Of 24 Florida counties with 30 or more tests for the same period, 17 reported a higher share; pooled, the state comes to 26.5%.
Which counties border Madison County?
Madison County borders 7 counties: Jefferson County, FL, Brooks County, GA, Lowndes County, GA, Hamilton County, FL, Taylor County, FL, Lafayette County, FL and Suwannee County, FL.
Products
Madison County, Products
Testing a home in Madison County
In Madison County, 1.1% of 89 tests reported to CDC in 2015 reached 4 pCi/L, against 26.5% 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 Madison County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Madison County, Bordering counties
Counties bordering Madison County
Calculated by Radon411- Radon levels in Jefferson County, FLEPA zone 3
14.3%at or above 4 pCi/L
Median 1.9 pCi/L · 7 tests · 13.2 points above Madison County
- Radon levels in Taylor County, FLEPA zone 3
0.0%at or above 4 pCi/L
Median 0.4 pCi/L · 84 tests · 1.1 points below Madison County
- Radon levels in Brooks County, GAEPA zone 3
No CDC figure for 2015; its page reads it against its own neighbours.
- Radon levels in Lowndes County, GAEPA zone 3
No CDC figure for 2015; its page reads it against its own neighbours.
- Radon levels in Hamilton County, FLEPA zone 3
No CDC figure for 2015; its page reads it against its own neighbours.
- Radon levels in Lafayette County, FLEPA zone 3
No CDC figure for 2015; its page reads it against its own neighbours.
- Radon levels in Suwannee County, FLEPA zone 3
No CDC figure for 2015; its page reads it against its own neighbours.
Madison County, Cities and towns
Cities and towns in Madison County
Madison County is growing: the Census Bureau puts it at 18,759 residents on July 1, 2025, up 5.0% from 17,863 in 2020. That works out to 27 people per square mile of land. No town dominates: Madison, the largest, has 2,988 residents, 15.9% of the total. Together its 3 incorporated places hold 22.1% of those residents; the other 77.9% live outside any of them. Testing is reported here more often than across the state: CDC's 89 reported tests for 2015 come to 4.7 for every 1,000 residents (2025 estimate), against 0.5 for Florida.
From Madison to Lee, CDC publishes no figure by town: each reads Madison County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Madison | 2,988 | +2.5% | 15.9% |
| Greenville | 778 | +3.6% | 4.1% |
| Lee | 379 | +3.8% | 2.0% |
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).
Madison County, Homes
Homes in Madison County
Of Madison County's 8,392 homes, 57% are detached houses, against 55% across Florida; 35% are mobile homes. Half of its homes were built before 1987, close to Florida's 1988: 21% date from before 1960 and 24% from 2000 or later. 72% 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 | Madison County | Florida |
|---|---|---|
| Housing units | 8,392 | 10,082,356 |
| Detached houses | 57% | 55% |
| In buildings of 5 or more | 3% | 25% |
| Mobile homes | 35% | 8% |
| Built before 1960 | 21% | 10% |
| Built since 2000 | 24% | 30% |
| Middle year built | 1987 | 1988 |
| Owner-occupied | 72% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.