Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Adair County, Oklahoma
EPA puts Adair County in Zone 2, its middle radon zone, and only 2 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
44.7%
Delaware County
- Delaware
- 44.7%
- Washington
- 14.3%
4 of 6 neighbours have 30+ tests, 2006 to 2015
Nearest county
32.0%
Cherokee County, 19 miles
- Cherokee
- 32.0%
- Oklahoma
- 12.6%
Share at 4+ pCi/L, 50 tests, 2006 to 2015
Ground above low
80.4%
65.2 pts above Oklahoma
- Adair
- 80.4%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
2
Too few for a share
- Adair
- 2
- 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 Adair 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
Adair County, At a glance
Adair County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Adair County is a
USGS geologic potential: Moderate across 80% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Adair County, 2008 to 2017, laboratory
CDC holds 2 reported tests for Adair County over the 2008 to 2017 laboratory totals, with a median of 3.8 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Adair County beside the counties around it is how this page reads it.
What these figures count
Only 2 tests were reported to CDC for Adair 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).
Adair County, Compared
Adair County radon figures, compared
Calculated by Radon411CDC's largest figure for Adair County rests on 2 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 50.0 points and no rank or comparison is drawn from it. Results reached as high as 5.4 pCi/L, with a middle value of 3.8 pCi/L.
Of the counties bordering it, 4 have a figure over the 2006 to 2015 laboratory totals: Delaware County reported the largest share at or above 4 pCi/L, 44.7%, and Washington County, AR the smallest, 14.3%, with Cherokee County at 32.0% and Benton County, AR at 30.8% between. Farther out, Tulsa County (74 miles away) at 6.0%, Washington County (90 miles away) at 11.3% and Oklahoma County (156 miles away) at 8.9% have figures too. Pooled across 53 Oklahoma counties, 12.6% of reported tests reached that level; across every county in the country with a figure, 36.3%.
Statewide for the same period, Delaware County reported the highest share (44.7%) and Tulsa County the lowest (6.0%). EPA's 1993 map puts Adair County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 80% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Adair County, Geology
The ground under Adair County
PredictedMost of the ground under Adair County is one class on USGS's geologic map: 80.4% of its land is moderate radon potential, with 19.6% low. The map puts 80.4% of Adair County in the area it calls Ozark Plateau and 19.6% in Boston Mountains. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Ozark Plateau | Mississippian and Pennsylvanian limestone and shale. | Moderate | 9 | 80.4% |
| Boston Mountains | Mississippian and Pennsylvanian sandstones and shales. | Low | 8 | 19.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Adair County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Adair County's is. Of the 6 counties that border it, 3 have more moderate-potential ground, Benton County, AR the most at 100%.
The map rates the ground, not the air in any home.
Local help
Adair County, Local resources
Radon testing and mitigation in Adair County
- Oklahoma's radon programDepartment of Environmental QualityOklahoma's radon program answers questions about testing, mitigation and the rules in Oklahoma.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
- See the Oklahoma directoryNo professionals are listed in Oklahoma yet. The state program can point you to registered testers and mitigators.
What it means
Adair County, Questions
Questions about radon in Adair County
Are radon levels high in Adair County?
Over the 2008 to 2017 laboratory totals, 50.0% of the radon tests reported to CDC for Adair County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.8 pCi/L. Of the counties bordering it, 4 have a figure over the 2006 to 2015 laboratory totals: Delaware County reported the largest share at or above 4 pCi/L, 44.7%, and Washington County, AR the smallest, 14.3%, with Cherokee County at 32.0% and Benton County, AR at 30.8% between.
Which counties border Adair County?
Adair County borders 6 counties: Cherokee County, OK, Sequoyah County, OK, Washington County, AR, Crawford County, AR, Delaware County, OK and Benton County, AR.
Products
Adair County, Products
Testing a home in Adair County
No CDC figure names Adair County; the nearest county with one, Cherokee County (19 miles away), reported 32.0% of its tests at or above 4 pCi/L over the 2006 to 2015 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 Adair 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
MonitorSafetySiren
Pro4 plug-in radon detector with a display and alarm
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 48 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Adair County, Bordering counties
Counties bordering Adair County
Calculated by Radon411- Radon levels in Delaware County, OKEPA zone 2
44.7%at or above 4 pCi/L
Median 2.5 pCi/L · 38 tests
- Radon levels in Cherokee County, OKEPA zone 2
32.0%at or above 4 pCi/L
Median 1.9 pCi/L · 50 tests
- Radon levels in Benton County, AREPA zone 2
30.8%at or above 4 pCi/L
Median 1.8 pCi/L · 133 tests
- Radon levels in Washington County, AREPA zone 3
14.3%at or above 4 pCi/L
Median 1.7 pCi/L · 56 tests
- Radon levels in Crawford County, AREPA zone 3
12.5%at or above 4 pCi/L
Median 0.7 pCi/L · 8 tests
- Radon levels in Sequoyah County, OKEPA zone 2
0.0%at or above 4 pCi/L
Median 1.6 pCi/L · 4 tests
Adair County, Cities and towns
Cities and towns in Adair County
The Census Bureau estimates 19,828 residents in Adair County for July 1, 2025, 379 more than in 2020 (+1.9%). That works out to 35 people per square mile of land. No town dominates: Stilwell, the largest, has 3,892 residents, 19.6% of the total. Together its 3 incorporated places hold 28.2% of those residents; the other 71.8% live outside any of them. Reported testing is thin here: 2 tests over 2008 to 2017, or 0.1 for every 1,000 residents (2025 estimate), where Oklahoma as a whole comes to 0.2.
From Stilwell to Watts, CDC publishes no figure by town: each reads Adair County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Stilwell | 3,892 | +5.3% | 19.6% |
| Westville | 1,413 | +0.5% | 7.1% |
| Watts | 280 | +2.6% | 1.4% |
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).
Adair County, Homes
Homes in Adair County
Of Adair County's 8,123 homes, 69% are detached houses, against 73% across Oklahoma; 20% are mobile homes. Half of its homes were built before 1982, close to Oklahoma's 1980: 15% date from before 1960 and 21% from 2000 or later. 68% of occupied homes are lived in by their owner (Oklahoma: 66%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Adair County | Oklahoma |
|---|---|---|
| Housing units | 8,123 | 1,763,036 |
| Detached houses | 69% | 73% |
| In buildings of 5 or more | 3% | 12% |
| Mobile homes | 20% | 9% |
| Built before 1960 | 15% | 21% |
| Built since 2000 | 21% | 25% |
| Middle year built | 1982 | 1980 |
| Owner-occupied | 68% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.