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 Knott County, Kentucky
EPA puts Knott County in Zone 2, its middle radon zone, and only 13 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
19.1%
Breathitt County
- Breathitt
- 19.1%
- Pike
- 17.1%
2 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
19.1%
Breathitt County, 23 miles
- Breathitt
- 19.1%
- Kentucky
- 43.7%
Share at 4+ pCi/L, 47 tests, 2008 to 2017
Ground above low
100.0%
5.7 pts above Kentucky
- Knott
- 100.0%
- Kentucky
- 94.3%
Share of land USGS rates moderate or high potential
Tests reported
13
Too few for a share
- Knott
- 13
- Needed
- 30
2008 to 2017, 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 Knott 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
Knott County, At a glance
Knott County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Knott County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Knott County, 2008 to 2017, laboratory
CDC holds 13 reported tests for Knott 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). Knott County beside the counties around it is how this page reads it.
What these figures count
Only 13 tests were reported to CDC for Knott 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).
Knott County, Compared
Knott County radon figures, compared
Calculated by Radon411CDC's largest figure for Knott County rests on 13 tests over the 2008 to 2017 laboratory totals, 3 of them at or above 4 pCi/L, so each test moves its share by 7.7 points and no rank or comparison is drawn from it. Results reached as high as 8.5 pCi/L, with a middle value of 1.7 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Breathitt County reported the largest share at or above 4 pCi/L, 19.1%, and Pike County the smallest, 17.1%. Farther out, Menifee County (54 miles away) at 22.0%, Estill County (60 miles away) at 44.1% and Rowan County (63 miles away) at 18.9% have figures too. Pooled across 120 Kentucky counties, 43.7% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Meade County reported the highest share (68.4%) and Hopkins County the lowest (9.5%). EPA's 1993 map puts Knott County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Knott County, Geology
The ground under Knott County
PredictedUSGS's geologic map puts all of Knott County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Cumberland Plateau, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Cumberland Plateau | Pennsylvanian sandstones, siltstones, and shales. | Moderate | 9 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Knott County beside the ground around it
Across Kentucky 18.2% of the land is rated high; none of Knott County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Breathitt County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Knott County, Local resources
Radon testing and mitigation in Knott County
- Kentucky's radon programKentucky Board of Radon SafetyKentucky's radon program answers questions about testing, mitigation and the rules in Kentucky.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Kentucky8 professionals are listed in Kentucky.
What Kentucky's program says
- Phone
- 502-782-2782
- Radon@ky.gov
What it means
Knott County, Questions
Questions about radon in Knott County
Are radon levels high in Knott County?
Over the 2008 to 2017 laboratory totals, 23.1% of the radon tests reported to CDC for Knott County, Kentucky were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Breathitt County reported the largest share at or above 4 pCi/L, 19.1%, and Pike County the smallest, 17.1%.
Which counties border Knott County?
Knott County borders 6 counties: Perry County, Floyd County, Letcher County, Breathitt County, Magoffin County and Pike County.
Products
Knott County, Products
Testing a home in Knott County
No CDC figure names Knott County; the nearest county with one, Breathitt County (23 miles away), reported 19.1% 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 Knott 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
RM-63Pro rechargeable radon monitor with a touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Knott County, Bordering counties
Counties bordering Knott County
Calculated by Radon411- Radon levels in Floyd CountyEPA zone 2
40.0%at or above 4 pCi/L
Median 2.7 pCi/L · 20 tests
- Radon levels in Letcher CountyEPA zone 2
31.8%at or above 4 pCi/L
Median 1.8 pCi/L · 22 tests
- Radon levels in Perry CountyEPA zone 2
20.8%at or above 4 pCi/L
Median 1.4 pCi/L · 24 tests
- Radon levels in Breathitt CountyEPA zone 2
19.1%at or above 4 pCi/L
Median 1.7 pCi/L · 47 tests
- Radon levels in Pike CountyEPA zone 2
17.1%at or above 4 pCi/L
Median 1.1 pCi/L · 82 tests
- Radon levels in Magoffin CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 0.5 pCi/L · 13 tests
Knott County, Cities and towns
Cities and towns in Knott County
Knott County has been losing residents: from 14,163 in 2020 to 13,321 on July 1, 2025, a fall of 5.9% by the Census Bureau's estimates. That works out to 38 people per square mile of land. No town dominates: Hindman, the largest, has 644 residents, 4.8% of the total. Reported testing is thin here: 13 tests over 2008 to 2017, or 1.0 for every 1,000 residents (2025 estimate), where Kentucky as a whole comes to 6.3.
From Hindman to Vicco, CDC publishes no figure by town: each reads Knott County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hindman | 644 | −9.3% | 4.8% |
| Pippa Passes | 583 | +25.4% | 4.4% |
| Viccoextends beyond Knott County | 302 | −6.5% | Counted whole |
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 Knott County is counted whole, so it has no share.
Knott County, Homes
Homes in Knott County
Of Knott County's 6,695 homes, 63% are detached houses, against 68% across Kentucky; 33% are mobile homes. Half of its homes were built before 1982, close to Kentucky's 1982: 19% date from before 1960 and 21% from 2000 or later. 71% of occupied homes are lived in by their owner (Kentucky: 68%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Knott County | Kentucky |
|---|---|---|
| Housing units | 6,695 | 2,010,655 |
| Detached houses | 63% | 68% |
| In buildings of 5 or more | 3% | 12% |
| Mobile homes | 33% | 11% |
| Built before 1960 | 19% | 22% |
| Built since 2000 | 21% | 24% |
| Middle year built | 1982 | 1982 |
| Owner-occupied | 71% | 68% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.