Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Cocke County, Tennessee
EPA puts Cocke County in Zone 2, its middle radon zone, and 18.4% of its 347 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
18.4%
6.5 pts below TN
- Cocke
- 18.4%
- Tennessee
- 24.9%
347 tests, 2023
Median result
1.4pCi/L
Below action level
- Cocke
- 1.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2023
Tests reported
347
2nd of 15 by tests
- Cocke
- 347
- Hamblen
- 594
Reported to CDC before any fix, 2023
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
9 of 15
Middle half
- Cocke
- 18.4%
- Blount
- 50.0%
By share, of 15 with 30+ tests
Read a result for Cocke County
Starts at Cocke County's median, 1.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 1.4 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. Cocke County's median reported result, 2023.
The data
Cocke County, At a glance
Cocke County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Cocke 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 Cocke County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2022 | 43.6% |
| 2023 | 18.4% |
2023: 18.4%. Across these years the share ran from 18.4% to 43.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 347 tests reported to CDC for Cocke 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).
Cocke County, Compared
Cocke County radon figures, compared
Calculated by Radon411Cocke County's 347 reported tests in 2023 had a middle value of 1.4 pCi/L and a maximum of 28.6 pCi/L, and 18.4% reached 4 pCi/L. Tennessee as a whole (70 Tennessee counties, pooled) comes to 24.9%: 6.5 points higher than here.
Among its state's counties it ranks 9th 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, 211 tests (60.8%) came in under 2 pCi/L, against 49.4% statewide, and 72 tests (20.7%) fell between 2 and 4, against 25.7% statewide. The busiest year on file was 2022, with 1,596 tests reported; the quietest, 2023, had 347.
EPA's 1993 zone map puts Cocke County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 67% of the county's land high radon potential.
Next door, the shares run from 17.1% in Jefferson County to 37.0% in Hamblen County, with Jefferson County below Cocke County.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Cocke County, Geology
The ground under Cocke County
PredictedUSGS's geologic map splits Cocke County: 67.1% of its land is high radon potential and 32.9% moderate. The map puts 67.1% of Cocke County in the area it calls Ridge and Valley and 32.6% in Unaka Mountains. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Ridge and Valley | Paleozoic sandstone and cherty dolostone. | High | 14 | 67.1% |
| Unaka Mountains | Precambrian and Paleozoic siltstone, sandstone, conglomerate, quartzite, phyllite, gneiss, granite, and metamorphosed volcanic rock. | Moderate | 11 | 32.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Cocke County beside the ground around it
Cocke County has more high-potential ground than Tennessee as a whole: 67.1% of its land against 47.2%. Of the 6 counties that border it, 3 have more high-potential ground, Hamblen County the most at 100%.
The map rates the ground, not the air in any home.
Local help
Cocke County, Local resources
Radon testing and mitigation in Cocke 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
Cocke County, Questions
Questions about radon in Cocke County
Are radon levels high in Cocke County?
In 2023, 18.4% of the radon tests reported to CDC for Cocke County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.4 pCi/L. Of 15 Tennessee counties with 30 or more tests for the same period, 8 reported a higher share; pooled, the state comes to 24.9%.
Which counties border Cocke County?
Cocke County borders 6 counties: Greene County, TN, Hamblen County, TN, Jefferson County, TN, Sevier County, TN, Madison County, NC and Haywood County, NC.
Products
Cocke County, Products
Testing a home in Cocke County
In Cocke County, 18.4% of 347 tests reported to CDC in 2023 reached 4 pCi/L, against 24.9% pooled across Tennessee. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Cocke County; a long-term test tells the year-round average.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Cocke County, Bordering counties
Counties bordering Cocke County
Calculated by Radon411- Radon levels in Greene County, TNEPA zone 1
47.1%at or above 4 pCi/L
Median 2.9 pCi/L · 17 tests · 28.7 points above Cocke County
- Radon levels in Hamblen County, TNEPA zone 1
37.0%at or above 4 pCi/L
Median 3.1 pCi/L · 594 tests · 18.6 points above Cocke County
- Radon levels in Sevier County, TNEPA zone 2
33.3%at or above 4 pCi/L
Median 2.3 pCi/L · 18 tests · 14.9 points above Cocke County
- Radon levels in Jefferson County, TNEPA zone 1
17.1%at or above 4 pCi/L
Median 2.6 pCi/L · 35 tests · 1.3 points below Cocke County
- Radon levels in Madison County, NCEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
- Radon levels in Haywood County, NCEPA zone 2
No CDC figure for 2023; its page reads it against its own neighbours.
Cocke County, Cities and towns
Cities and towns in Cocke County
Cocke County is growing: the Census Bureau puts it at 37,889 residents on July 1, 2025, up 5.1% from 36,043 in 2020. That works out to 87 people per square mile of land. No town dominates: Newport, the largest, has 7,049 residents, 18.6% of the total. Together its 2 incorporated places hold 19.2% of those residents; the other 80.8% live outside any of them. Testing is reported here more often than across the state: CDC's 347 reported tests for 2023 come to 9.2 for every 1,000 residents (2025 estimate), against 0.3 for Tennessee.
From Newport to Parrottsville, CDC publishes no figure by town: each reads Cocke County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Newport | 7,049 | +2.9% | 18.6% |
| Parrottsville | 228 | +7.5% | 0.6% |
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).
Cocke County, Homes
Homes in Cocke County
Of Cocke County's 17,883 homes, 62% are detached houses, against 68% across Tennessee; 30% are mobile homes. Half of its homes were built before 1987, close to Tennessee's 1986: 17% date from before 1960 and 23% from 2000 or later. 71% 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 | Cocke County | Tennessee |
|---|---|---|
| Housing units | 17,883 | 3,095,472 |
| Detached houses | 62% | 68% |
| In buildings of 5 or more | 2% | 14% |
| Mobile homes | 30% | 8% |
| Built before 1960 | 17% | 18% |
| Built since 2000 | 23% | 29% |
| Middle year built | 1987 | 1986 |
| Owner-occupied | 71% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.