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 Bradley County, Tennessee
EPA puts Bradley County in Zone 1, its highest radon zone, and 25.7% of its 105 reported radon tests (2023) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
25.7%
0.8 pts above TN
- Bradley
- 25.7%
- Tennessee
- 24.9%
105 tests, 2023
Median result
2.2pCi/L
Below action level
- Bradley
- 2.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
105
7th of 15 by tests
- Bradley
- 105
- Hamblen
- 594
Reported to CDC before any fix, 2023
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
6 of 15
Middle half
- Bradley
- 25.7%
- Blount
- 50.0%
By share, of 15 with 30+ tests
Read a result for Bradley County
Starts at Bradley County's median, 2.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.2 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Bradley County's median reported result, 2023.
The data
Bradley County, At a glance
Bradley County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Bradley County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Bradley County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2022 | 16.7% |
| 2023 | 25.7% |
2023: 25.7%. Across these years the share ran from 16.7% to 25.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 105 tests reported to CDC for Bradley County over 2023, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Bradley County, Compared
Bradley County radon figures, compared
Calculated by Radon411Bradley County's 105 reported tests in 2023 had a middle value of 2.2 pCi/L and a maximum of 34.0 pCi/L, and 25.7% reached 4 pCi/L. Tennessee as a whole (70 Tennessee counties, pooled) comes to 24.9%: 0.8 points lower than here.
Among its state's counties it ranks 6th of 15 Tennessee counties with 30 or more tests for the same period. Statewide for the same period, Blount County reported the highest share (50.0%) and Hamilton County the lowest (2.4%).
Below the action level, 49 tests (46.7%) came in under 2 pCi/L, against 49.4% statewide, and 29 tests (27.6%) fell between 2 and 4, against 25.7% statewide. The busiest year on file was 2023, with 105 tests reported; the quietest, 2022, had 18.
EPA's 1993 zone map puts Bradley County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Hamilton County, the one bordering county with a figure for the same period, reported 2.4%.
CDC also counts 6 tests taken after mitigation in Bradley County for the same period: tests in homes where a fix was already in.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Bradley County, Geology
The ground under Bradley County
PredictedMost of the ground under Bradley County is one class on USGS's geologic map: 99.7% of its land is high radon potential, with 0.3% low. All of it lies in the area the map calls Ridge and Valley, to which USGS gives a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Ridge and Valley | Paleozoic sandstone and cherty dolostone. | High | 14 | 99.7% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Bradley County beside the ground around it
Bradley County has more high-potential ground than Tennessee as a whole: 99.7% of its land against 47.2%. Of the 7 counties that border it, 2 have more high-potential ground, McMinn County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Bradley County, Local resources
Radon testing and mitigation in Bradley 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
Bradley County, Questions
Questions about radon in Bradley County
Are radon levels high in Bradley County?
In 2023, 25.7% of the radon tests reported to CDC for Bradley County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 15 Tennessee counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 24.9%.
Which counties border Bradley County?
Bradley County borders 7 counties: Hamilton County, TN, Polk County, TN, Catoosa County, GA, McMinn County, TN, Meigs County, TN, Murray County, GA and Whitfield County, GA.
Products
Bradley County, Products
Testing a home in Bradley County
In Bradley County, 25.7% of 105 tests reported to CDC in 2023 reached 4 pCi/L, against 24.9% pooled across Tennessee. In Zone 1 the year-round level in Bradley 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
MonitorAEGTEST
HOUND-1011S rechargeable radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 12 hours
Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Bradley County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Bradley County
Explore
Bradley County, Bordering counties
Counties bordering Bradley County
Calculated by Radon411- Radon levels in Polk County, TNEPA zone 2
66.7%at or above 4 pCi/L
Median 4.4 pCi/L · 3 tests · 41.0 points above Bradley County
- Radon levels in McMinn County, TNEPA zone 1
25.0%at or above 4 pCi/L
Median 1.6 pCi/L · 4 tests · 0.7 points below Bradley County
- Radon levels in Hamilton County, TNEPA zone 2
2.4%at or above 4 pCi/L
Median 0.7 pCi/L · 169 tests · 23.3 points below Bradley County
- Radon levels in Meigs County, TNEPA zone 1
0.0%at or above 4 pCi/L
Median 1.3 pCi/L · 2 tests · 25.7 points below Bradley County
- Radon levels in Catoosa County, GAEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Murray County, GAEPA zone 3
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Whitfield County, GAEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
Bradley County, Cities and towns
Cities and towns in Bradley County
Bradley County is growing: the Census Bureau puts it at 115,465 residents on July 1, 2025, up 6.1% from 108,832 in 2020. That works out to 351 people per square mile of land. Its largest town, Cleveland, has 51,172 residents, 44.3% of the total. Together its 2 incorporated places hold 45.1% of those residents; the other 54.9% live outside any of them. Testing is reported here more often than across the state: CDC's 105 reported tests for 2023 come to 0.9 for every 1,000 residents (2025 estimate), against 0.3 for Tennessee.
From Cleveland to Charleston, CDC publishes no figure by town: each reads Bradley County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Cleveland | 51,172 | +6.8% | 44.3% |
| Charleston | 923 | +5.1% | 0.8% |
Places in Bradley County with a city page: 1 of 1
2 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).
Bradley County, Homes
Homes in Bradley County
Of Bradley County's 45,411 homes, 70% are detached houses, against 68% across Tennessee; 9% are mobile homes. Half of its homes were built before 1985, close to Tennessee's 1986: 14% date from before 1960 and 26% from 2000 or later. 68% 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 | Bradley County | Tennessee |
|---|---|---|
| Housing units | 45,411 | 3,095,472 |
| Detached houses | 70% | 68% |
| In buildings of 5 or more | 8% | 14% |
| Mobile homes | 9% | 8% |
| Built before 1960 | 14% | 18% |
| Built since 2000 | 26% | 29% |
| Middle year built | 1985 | 1986 |
| Owner-occupied | 68% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.