Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Madison County, Tennessee
EPA puts Madison County in Zone 1, its highest radon zone, and only 4 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
8.7%
24.6 pts below TN
- Madison
- 8.7%
- Tennessee
- 33.3%
92 tests, 2008 to 2017
Median result
1.2pCi/L
Below action level
- Madison
- 1.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
92
48th of 80 by tests
- Madison
- 92
- Davidson
- 5,592
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Tennessee
72 of 80
Lowest quarter
- Madison
- 8.7%
- Jefferson
- 56.8%
By share, of 80 with 30+ tests
Read a result for Madison County
Starts at Madison County's median, 1.2 pCi/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
- 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, 2008 to 2017.
The data
Madison County, At a glance
Madison County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Madison County in
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 |
|---|---|
| 2022 | 0.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 4 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 Radon411Madison County reports fewer high tests than Tennessee overall. 8.7% of its 92 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 24.6 points below the 33.3% pooled from 95 Tennessee counties.
The newest figure, in 2023, counts only 4 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 92-test figure.
Ordered from highest share down, it comes 72nd of 80 Tennessee counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Madison County sits 27.0 points below it.
Next door, the shares run from 0.0% in Chester County to 16.7% in Henderson County, with Gibson County and Chester County below Madison County. The reported tests do not follow EPA's Zone 1 label for Madison County (predicted average above 4 pCi/L): 8.7% of them reached 4 pCi/L, fewer than that label suggests.
Half the tests came in under 1.2 pCi/L and half over it; the single highest reached 45.0 pCi/L. The rest split 79.3% under 2 pCi/L and 12.0% from 2 to 4 (Tennessee: 42.4% and 24.3%).
The busiest year on file was 2023, with 4 tests reported; the quietest, 2022, had 3.
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. All of it lies in the area the map calls Loess-Covered Coastal Plain, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Loess-Covered Coastal Plain | Cretaceous and younger marine and fluvial sand, clay, and marl covered with loess. | Low | 8 | 100% |
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 Tennessee 47.2% of the land is rated high; none of Madison County's is. Of the 7 counties that border it, 4 have more moderate-potential ground, Henderson County the most at 78.6%.
The map rates the ground, not the air in any home.
Local help
Madison County, Local resources
Radon testing and mitigation in Madison County
- Tennessee Radon ProgramTennessee Radon Program, run by Department of Environment & Conservation, offers free or discounted test kits, and answers questions about testing and mitigation in Tennessee.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The Tennessee Radon Program provides free radon test kits and information assistance to residents, while also providing training opportunities to radon professionals across the state.
- Compare kits
- Professionals in Tennessee1 professional is listed in Tennessee.
What Tennessee's program says
- Phone
- 1-800-232-1139
- TDEC.Radon@tn.gov
What it means
Madison County, Questions
Questions about radon in Madison County
Are radon levels high in Madison County?
In 2023, 0.0% of the radon tests reported to CDC for Madison County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 71 reported a higher share; pooled, the state comes to 33.3%.
Which counties border Madison County?
Madison County borders 7 counties: Chester County, Haywood County, Crockett County, Henderson County, Gibson County, Carroll County and Hardeman County.
Products
Madison County, Products
Testing a home in Madison County
In Madison County, 8.7% of 92 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 33.3% pooled across Tennessee. In Zone 1 the year-round level in Madison County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
Monitor
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Madison County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Madison County
Explore
Madison County, Bordering counties
Counties bordering Madison County
Calculated by Radon411- Radon levels in Crockett CountyEPA zone 3
21.1%at or above 4 pCi/L
Median 1.2 pCi/L · 19 tests · 12.4 points above Madison County
- Radon levels in Carroll CountyEPA zone 3
20.0%at or above 4 pCi/L
Median 1.0 pCi/L · 25 tests · 11.3 points above Madison County
- Radon levels in Hardeman CountyEPA zone 3
20.0%at or above 4 pCi/L
Median 1.6 pCi/L · 5 tests · 11.3 points above Madison County
- Radon levels in Henderson CountyEPA zone 2
16.7%at or above 4 pCi/L
Median 1.6 pCi/L · 30 tests · 8.0 points above Madison County
- Radon levels in Gibson CountyEPA zone 3
5.3%at or above 4 pCi/L
Median 1.0 pCi/L · 57 tests · 3.4 points below Madison County
- Radon levels in Chester CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 44 tests · 8.7 points below Madison County
- Radon levels in Haywood CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 23 tests · 8.7 points below Madison County
Madison County, Cities and towns
Cities and towns in Madison County
The Census Bureau estimates 100,790 residents in Madison County for July 1, 2025, 1,958 more than in 2020 (+2.0%). That works out to 181 people per square mile of land. Jackson alone is home to 69,339 of them, 68.8% of the total. Reported testing is thin here: 92 tests over 2008 to 2017, or 0.9 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.2.
From Jackson to Medon, CDC publishes no figure by town: each reads Madison County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Jackson | 69,339 | +1.7% | 68.8% |
| Humboldtextends beyond Madison County | 7,841 | −0.5% | Counted whole |
| Three Way | 1,933 | +2.5% | 1.9% |
| Medon | 198 | +4.2% | 0.2% |
4 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 Madison County is counted whole, so it has no share.
Madison County, Homes
Homes in Madison County
Of Madison County's 43,919 homes, 71% are detached houses, against 68% across Tennessee; 12% are in buildings of five or more homes. Half of its homes were built before 1985, close to Tennessee's 1986: 17% date from before 1960 and 22% from 2000 or later. 62% of occupied homes are lived in by their owner (Tennessee: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Madison County | Tennessee |
|---|---|---|
| Housing units | 43,919 | 3,095,472 |
| Detached houses | 71% | 68% |
| In buildings of 5 or more | 12% | 14% |
| Mobile homes | 6% | 8% |
| Built before 1960 | 17% | 18% |
| Built since 2000 | 22% | 29% |
| Middle year built | 1985 | 1986 |
| Owner-occupied | 62% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.