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 Hancock County, Tennessee
EPA puts Hancock County in Zone 1, its highest radon zone, and only 22 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
50.7%
Scott County
- Scott
- 50.7%
- Hawkins
- 38.4%
4 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
38.4%
Hawkins County, 16 miles
- Hawkins
- 38.4%
- Tennessee
- 33.3%
Share at 4+ pCi/L, 289 tests, 2008 to 2017
Ground above low
100.0%
30.5 pts above Tennessee
- Hancock
- 100.0%
- Tennessee
- 69.5%
Share of land USGS rates moderate or high potential
Tests reported
22
Too few for a share
- Hancock
- 22
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Read a result for Hancock 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
Hancock County, At a glance
Hancock County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Hancock 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 Hancock County, 2008 to 2017, laboratory
CDC holds 22 reported tests for Hancock County over the 2008 to 2017 laboratory totals, with a median of 1.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Hancock County beside the counties around it is how this page reads it.
What these figures count
Only 22 tests were reported to CDC for Hancock 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).
Hancock County, Compared
Hancock County radon figures, compared
Calculated by Radon411CDC's largest figure for Hancock County rests on 22 tests over the 2008 to 2017 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 4.5 points and no rank or comparison is drawn from it. Results reached as high as 11.1 pCi/L, with a middle value of 1.8 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Scott County, VA reported the largest share at or above 4 pCi/L, 50.7%, and Hawkins County the smallest, 38.4%, with Grainger County at 48.2% and Claiborne County at 44.0% between. Farther out, Hamblen County (21 miles away) at 45.2%, Greene County (32 miles away) at 46.0% and Jefferson County (35 miles away) at 56.8% 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 Hancock County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Hancock County, Geology
The ground under Hancock County
PredictedUSGS's geologic map puts all of Hancock County's mapped land in one class: high radon potential. 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Hancock County beside the ground around it
Hancock County has more high-potential ground than Tennessee as a whole: 100% of its land against 47.2%. Of the 5 counties that border it, none has as large a share of high-potential ground; Grainger County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Hancock County, Local resources
Radon testing and mitigation in Hancock 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
Hancock County, Questions
Questions about radon in Hancock County
Are radon levels high in Hancock County?
Over the 2008 to 2017 laboratory totals, 9.1% of the radon tests reported to CDC for Hancock County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Scott County, VA reported the largest share at or above 4 pCi/L, 50.7%, and Hawkins County the smallest, 38.4%, with Grainger County at 48.2% and Claiborne County at 44.0% between.
Which counties border Hancock County?
Hancock County borders 5 counties: Hawkins County, TN, Claiborne County, TN, Grainger County, TN, Lee County, VA and Scott County, VA.
Products
Hancock County, Products
Testing a home in Hancock County
No CDC figure names Hancock County; the nearest county with one, Hawkins County (16 miles away), reported 38.4% 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 1 the year-round level in Hancock 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
lüft plug-in radon and indoor air quality monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi, Bluetooth
- App only
First reading: Within 90 minutes
Short-term kitempowerDX
Standard Radon Test short-term mail-in radon test kit
- Lab fee included
Method: Passive sampler
In home: 48 to 96 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Hancock County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Hancock County
Explore
Hancock County, Bordering counties
Counties bordering Hancock County
Calculated by Radon411- Radon levels in Scott County, VAEPA zone 1
50.7%at or above 4 pCi/L
Median 4.0 pCi/L · 75 tests
- Radon levels in Lee County, VAEPA zone 1
50.0%at or above 4 pCi/L
Median 4.9 pCi/L · 14 tests
- Radon levels in Grainger County, TNEPA zone 1
48.2%at or above 4 pCi/L
Median 3.8 pCi/L · 56 tests
- Radon levels in Claiborne County, TNEPA zone 1
44.0%at or above 4 pCi/L
Median 3.3 pCi/L · 125 tests
- Radon levels in Hawkins County, TNEPA zone 1
38.4%at or above 4 pCi/L
Median 2.7 pCi/L · 289 tests
Hancock County, Cities and towns
Cities and towns in Hancock County
Hancock County is growing: the Census Bureau puts it at 7,075 residents on July 1, 2025, up 6.7% from 6,628 in 2020. That works out to 32 people per square mile of land. Sneedville, its one incorporated place, has 1,349 residents, 19.1% of the total. CDC's 22 reported tests for 2008 to 2017 work out to 3.1 per 1,000 residents (2025 estimate), close to Tennessee's 4.2.
Sneedville is the one incorporated place here; CDC publishes no figure by town, so it reads Hancock County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sneedville | 1,349 | +6.0% | 19.1% |
One incorporated place, 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).
Hancock County, Homes
Homes in Hancock County
Of Hancock County's 3,667 homes, 67% are detached houses, against 68% across Tennessee; 24% are mobile homes. Half of its homes were built before 1982, close to Tennessee's 1986: 25% date from before 1960 and 23% from 2000 or later. 73% 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 | Hancock County | Tennessee |
|---|---|---|
| Housing units | 3,667 | 3,095,472 |
| Detached houses | 67% | 68% |
| In buildings of 5 or more | 4% | 14% |
| Mobile homes | 24% | 8% |
| Built before 1960 | 25% | 18% |
| Built since 2000 | 23% | 29% |
| Middle year built | 1982 | 1986 |
| Owner-occupied | 73% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.