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 Hardin County, Tennessee
EPA puts Hardin County in Zone 2, its middle radon zone, and only 3 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
7.9%
25.4 pts below TN
- Hardin
- 7.9%
- Tennessee
- 33.3%
38 tests, 2008 to 2017
Median result
1.0pCi/L
Below action level
- Hardin
- 1.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
38
73rd of 80 by tests
- Hardin
- 38
- Davidson
- 5,592
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Tennessee
74 of 80
Lowest quarter
- Hardin
- 7.9%
- Jefferson
- 56.8%
By share, of 80 with 30+ tests
Read a result for Hardin County
Starts at Hardin County's median, 1.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.0 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. Hardin County's median reported result, 2008 to 2017.
The data
Hardin County, At a glance
Hardin County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Hardin County is a
USGS geologic potential: High across 43% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Hardin County, 2022
CDC holds 3 reported tests for Hardin County in 2022, with a median of 1.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Hardin County beside the counties around it is how this page reads it.
What these figures count
Only 3 tests were reported to CDC for Hardin County over 2022, 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: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).
Hardin County, Compared
Hardin County radon figures, compared
Calculated by Radon411Hardin County reports fewer high tests than Tennessee overall. 7.9% of its 38 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 25.4 points below the 33.3% pooled from 95 Tennessee counties.
The newest figure, in 2022, counts only 3 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 38-test figure.
Ordered from highest share down, it comes 74th 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%; Hardin County sits 27.8 points below it.
Next door, the shares run from 0.0% in Chester County to 27.2% in Lauderdale County, AL, with Chester County below Hardin County. The reported tests do not follow EPA's Zone 2 label for Hardin County (predicted average between 2 and 4 pCi/L): 7.9% of them reached 4 pCi/L, fewer than that label suggests.
Half the tests came in under 1.0 pCi/L and half over it; the single highest reached 5.9 pCi/L. The rest split 73.7% under 2 pCi/L and 18.4% from 2 to 4 (Tennessee: 42.4% and 24.3%).
CDC's ten-year totals for Hardin County went from 27 tests (2005 to 2014) to 38 (2008 to 2017), the share going from 7.4% to 7.9%.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hardin County, Geology
The ground under Hardin County
PredictedNo class of ground holds half of Hardin County on USGS's geologic map: 42.7% of its land is high radon potential, 14.9% moderate and 42.4% low. The map puts 42.4% of Hardin County in the area it calls Tombigbee Hills and 36.9% in Cherty Highland, with 2 smaller areas beside them. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Tombigbee Hills | Clay, sand, sandstone, chalk, chalky marl, quartzose, chert gravels, and quartz sand. | Low | 8 | 42.4% |
| Cherty Highland | Cherty dolostone. | High | 12 | 36.9% |
| East Coastal Plain | Cretaceous and younger marine and fluvial sand, clay, and marl. | Moderate | 9 | 14.9% |
| Interior Low Plateaus | Mississippian carbonate rocks and shales. | High | 12 | 5.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hardin County beside the ground around it
On high-potential ground Hardin County is close to Tennessee as a whole: 42.7% of its land against 47.2%. Of the 8 counties that border it, 3 have more high-potential ground, Lauderdale County, AL the most at 87.8%.
The map rates the ground, not the air in any home.
Local help
Hardin County, Local resources
Radon testing and mitigation in Hardin 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
Hardin County, Questions
Questions about radon in Hardin County
Are radon levels high in Hardin County?
In 2022, 0.0% of the radon tests reported to CDC for Hardin County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 80 Tennessee counties with 30 or more tests for the same period, 73 reported a higher share; pooled, the state comes to 33.3%.
Which counties border Hardin County?
Hardin County borders 8 counties: McNairy County, TN, Wayne County, TN, Alcorn County, MS, Chester County, TN, Decatur County, TN, Tishomingo County, MS, Lauderdale County, AL and Henderson County, TN.
Products
Hardin County, Products
Testing a home in Hardin County
In Hardin County, 7.9% of 38 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 33.3% pooled across Tennessee. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Hardin County; a long-term test tells the year-round average.
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
Hardin County, Bordering counties
Counties bordering Hardin County
Calculated by Radon411- Radon levels in Decatur County, TNEPA zone 2
29.4%at or above 4 pCi/L
Median 1.7 pCi/L · 17 tests · 21.5 points above Hardin County
- Radon levels in Lauderdale County, ALEPA zone 1
27.2%at or above 4 pCi/L
Median 2.2 pCi/L · 1,885 tests · 19.3 points above Hardin County
- Radon levels in Henderson County, TNEPA zone 2
16.7%at or above 4 pCi/L
Median 1.6 pCi/L · 30 tests · 8.8 points above Hardin County
- Radon levels in McNairy County, TNEPA zone 2
8.5%at or above 4 pCi/L
Median 1.0 pCi/L · 59 tests · 0.6 points above Hardin County
- Radon levels in Wayne County, TNEPA zone 1
7.7%at or above 4 pCi/L
Median 1.7 pCi/L · 26 tests · 0.2 points below Hardin County
- Radon levels in Chester County, TNEPA zone 2
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 44 tests · 7.9 points below Hardin County
- Radon levels in Alcorn County, MSEPA zone 2
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Tishomingo County, MSEPA zone 3
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Hardin County, Cities and towns
Cities and towns in Hardin County
The Census Bureau estimates 27,983 residents in Hardin County for July 1, 2025, 1,035 more than in 2020 (+3.8%). That works out to 48 people per square mile of land. Its largest town, Savannah, has 7,689 residents, 27.5% of the total. Reported testing is thin here: 38 tests over 2008 to 2017, or 1.4 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.2.
From Savannah to Milledgeville, CDC publishes no figure by town: each reads Hardin County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Savannah | 7,689 | +4.5% | 27.5% |
| Adamsvilleextends beyond Hardin County | 2,081 | −0.1% | Counted whole |
| Crump | 946 | +4.3% | 3.4% |
| Saltillo | 441 | +3.5% | 1.6% |
| Milledgevilleextends beyond Hardin County | 275 | +1.9% | Counted whole |
5 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 Hardin County is counted whole, so it has no share.
Hardin County, Homes
Homes in Hardin County
Hardin County is a place of houses on their own lots: 78% of its 15,096 homes are detached single-family houses, against 68% across Tennessee. Half of its homes were built before 1985, close to Tennessee's 1986: 12% date from before 1960 and 23% from 2000 or later. Owners live in 78% of the occupied homes (Tennessee: 67%), so for most households a test and a fix are their own to order.
| Homes | Hardin County | Tennessee |
|---|---|---|
| Housing units | 15,096 | 3,095,472 |
| Detached houses | 78% | 68% |
| In buildings of 5 or more | 1% | 14% |
| Mobile homes | 17% | 8% |
| Built before 1960 | 12% | 18% |
| Built since 2000 | 23% | 29% |
| Middle year built | 1985 | 1986 |
| Owner-occupied | 78% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.