Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Decatur County, Tennessee
EPA puts Decatur County in Zone 2, its middle radon zone, and only 17 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
33.3%
Benton County
- Benton
- 33.3%
- Hardin
- 7.9%
4 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
32.5%
Perry County, 14 miles
- Perry
- 32.5%
- Tennessee
- 33.3%
Share at 4+ pCi/L, 40 tests, 2008 to 2017
Ground above low
100.0%
30.5 pts above Tennessee
- Decatur
- 100.0%
- Tennessee
- 69.5%
Share of land USGS rates moderate or high potential
Tests reported
20
Too few for a share
- Decatur
- 20
- Needed
- 30
2006 to 2015, laboratory
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Decatur County
Starts at EPA's action level
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
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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.
The data
Decatur County, At a glance
Decatur County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Decatur County is a
USGS geologic potential: High across 67% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Decatur County, 2008 to 2017, laboratory
CDC holds 17 reported tests for Decatur County over the 2008 to 2017 laboratory totals, with a median of 1.7 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Decatur County beside the counties around it is how this page reads it.
What these figures count
Only 17 tests were reported to CDC for Decatur County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Decatur County, Compared
Decatur County radon figures, compared
Calculated by Radon411CDC's largest figure for Decatur County rests on 20 tests over the 2006 to 2015 laboratory totals, 5 of them at or above 4 pCi/L, so each test moves its share by 5.0 points and no rank or comparison is drawn from it. Results reached as high as 11.5 pCi/L, with a middle value of 2.1 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Benton County reported the largest share at or above 4 pCi/L, 33.3%, and Hardin County the smallest, 7.9%, with Perry County at 32.5% and Henderson County at 16.7% between. Farther out, Chester County (31 miles away) at 0.0%, Lewis County (35 miles away) at 16.1% and Humphreys County (36 miles away) at 23.8% have figures too. Pooled across 95 Tennessee counties, 33.3% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Jefferson County reported the highest share (56.8%) and Chester County the lowest (0.0%). EPA's 1993 map puts Decatur County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 67% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Decatur County, Geology
The ground under Decatur County
PredictedUSGS's geologic map splits Decatur County: 67.3% of its land is high radon potential and 32.7% moderate. The map puts 67.3% of Decatur County in the area it calls Cherty Highland and 32.7% in East Coastal Plain. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Cherty Highland | Cherty dolostone. | High | 12 | 67.3% |
| East Coastal Plain | Cretaceous and younger marine and fluvial sand, clay, and marl. | Moderate | 9 | 32.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Decatur County beside the ground around it
Decatur County has more high-potential ground than Tennessee as a whole: 67.3% of its land against 47.2%. Of the 6 counties that border it, 2 have more high-potential ground, Perry County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Decatur County, Local resources
Radon testing and mitigation in Decatur 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
Decatur County, Questions
Questions about radon in Decatur County
Are radon levels high in Decatur County?
Over the 2008 to 2017 laboratory totals, 29.4% of the radon tests reported to CDC for Decatur County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Benton County reported the largest share at or above 4 pCi/L, 33.3%, and Hardin County the smallest, 7.9%, with Perry County at 32.5% and Henderson County at 16.7% between.
Which counties border Decatur County?
Decatur County borders 6 counties: Perry County, Henderson County, Carroll County, Benton County, Wayne County and Hardin County.
Products
Decatur County, Products
Testing a home in Decatur County
No CDC figure names Decatur County; the nearest county with one, Perry County (14 miles away), reported 32.5% 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. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Decatur 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
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Decatur County, Bordering counties
Counties bordering Decatur County
Calculated by Radon411- Radon levels in Benton CountyEPA zone 2
33.3%at or above 4 pCi/L
Median 2.0 pCi/L · 30 tests
- Radon levels in Perry CountyEPA zone 1
32.5%at or above 4 pCi/L
Median 2.0 pCi/L · 40 tests
- Radon levels in Carroll CountyEPA zone 3
20.0%at or above 4 pCi/L
Median 1.0 pCi/L · 25 tests
- Radon levels in Henderson CountyEPA zone 2
16.7%at or above 4 pCi/L
Median 1.6 pCi/L · 30 tests
- Radon levels in Hardin CountyEPA zone 2
7.9%at or above 4 pCi/L
Median 1.0 pCi/L · 38 tests
- Radon levels in Wayne CountyEPA zone 1
7.7%at or above 4 pCi/L
Median 1.7 pCi/L · 26 tests
Decatur County, Cities and towns
Cities and towns in Decatur County
The Census Bureau estimates 11,820 residents in Decatur County for July 1, 2025, 391 more than in 2020 (+3.4%). That works out to 35 people per square mile of land. No town dominates: Parsons, the largest, has 2,162 residents, 18.3% of the total. Reported testing is thin here: 20 tests over 2006 to 2015, or 1.7 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 3.5.
From Parsons to Decaturville, CDC publishes no figure by town: each reads Decatur County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Parsons | 2,162 | +3.4% | 18.3% |
| Scotts Hillextends beyond Decatur County | 893 | +3.5% | Counted whole |
| Decaturville | 813 | +1.1% | 6.9% |
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). A place that extends beyond Decatur County is counted whole, so it has no share.
Decatur County, Homes
Homes in Decatur County
Decatur County is a place of houses on their own lots: 76% of its 6,588 homes are detached single-family houses, against 68% across Tennessee. Half of its homes were built before 1982, close to Tennessee's 1986: 18% date from before 1960 and 23% from 2000 or later. 75% 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 | Decatur County | Tennessee |
|---|---|---|
| Housing units | 6,588 | 3,095,472 |
| Detached houses | 76% | 68% |
| In buildings of 5 or more | 2% | 14% |
| Mobile homes | 20% | 8% |
| Built before 1960 | 18% | 18% |
| Built since 2000 | 23% | 29% |
| Middle year built | 1982 | 1986 |
| Owner-occupied | 75% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.