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
Locations and reports
Radon Levels in Sequoyah County, Oklahoma
EPA puts Sequoyah County in Zone 2, its middle radon zone, and only 4 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
32.0%
Cherokee County
- Cherokee
- 32.0%
1 of 7 neighbours have 30+ tests, 2006 to 2015
Nearest county
32.0%
Cherokee County, 32 miles
- Cherokee
- 32.0%
- Oklahoma
- 12.6%
Share at 4+ pCi/L, 50 tests, 2006 to 2015
Ground above low
2.6%
12.6 pts below Oklahoma
- Sequoyah
- 2.6%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
4
Too few for a share
- Sequoyah
- 4
- 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 Sequoyah 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
Sequoyah County, At a glance
Sequoyah County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Sequoyah County is a
USGS geologic potential: Low across 97% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Sequoyah County, 2008 to 2017, laboratory
CDC holds 4 reported tests for Sequoyah County over the 2008 to 2017 laboratory totals, with a median of 1.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Sequoyah County beside the counties around it is how this page reads it.
What these figures count
Only 4 tests were reported to CDC for Sequoyah 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).
Sequoyah County, Compared
Sequoyah County radon figures, compared
Calculated by Radon411CDC's largest figure for Sequoyah County rests on 4 tests over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 25.0 points and no rank or comparison is drawn from it. Results reached as high as 3.4 pCi/L, with a middle value of 1.6 pCi/L.
Cherokee County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 32.0% of its tests at or above 4 pCi/L. Farther out, Delaware County (63 miles away) at 44.7%, Tulsa County (79 miles away) at 6.0% and Washington County (106 miles away) at 11.3% 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 Sequoyah County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 97% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sequoyah County, Geology
The ground under Sequoyah County
PredictedMost of the ground under Sequoyah County is one class on USGS's geologic map: 97.4% of its land is low radon potential, with 2.6% moderate. The map puts 73.9% of Sequoyah County in the area it calls Lower Arkansas River Valley and 23.5% in Boston Mountains, with one smaller area beside them. USGS gives both a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Lower Arkansas River Valley | Pennsylvanian sandstone, siltstone, shale. | Low | 8 | 73.9% |
| Boston Mountains | Mississippian and Pennsylvanian sandstones and shales. | Low | 8 | 23.5% |
| Ozark Plateau | Mississippian and Pennsylvanian limestone and shale. | Moderate | 9 | 2.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sequoyah County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Sequoyah County's is. Of the 7 counties that border it, 3 have more moderate-potential ground, Cherokee County the most at 83.3%.
The map rates the ground, not the air in any home.
Local help
Sequoyah County, Local resources
Radon testing and mitigation in Sequoyah 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
Sequoyah County, Questions
Questions about radon in Sequoyah County
Are radon levels high in Sequoyah County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Sequoyah County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Cherokee County, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 32.0% of its tests at or above 4 pCi/L.
Which counties border Sequoyah County?
Sequoyah County borders 7 counties: Adair County, OK, Haskell County, OK, Cherokee County, OK, Crawford County, AR, Le Flore County, OK, Muskogee County, OK and Sebastian County, AR.
Products
Sequoyah County, Products
Testing a home in Sequoyah County
No CDC figure names Sequoyah County; the nearest county with one, Cherokee County (32 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 Sequoyah 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
Monitor
EcoQube Wi-Fi continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Wi-Fi
- App only
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Sequoyah County, Bordering counties
Counties bordering Sequoyah County
Calculated by Radon411- Radon levels in Adair County, OKEPA zone 2
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 2 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 Crawford County, AREPA zone 3
12.5%at or above 4 pCi/L
Median 0.7 pCi/L · 8 tests
- Radon levels in Muskogee County, OKEPA zone 3
6.7%at or above 4 pCi/L
Median 1.3 pCi/L · 15 tests
- Radon levels in Sebastian County, AREPA zone 3
3.4%at or above 4 pCi/L
Median 0.1 pCi/L · 29 tests
- Radon levels in Haskell County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 1 test
- Radon levels in Le Flore County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 8 tests
Sequoyah County, Cities and towns
Cities and towns in Sequoyah County
The Census Bureau estimates 40,842 residents in Sequoyah County for July 1, 2025, 1,603 more than in 2020 (+4.1%). That works out to 61 people per square mile of land. Its largest town, Sallisaw, has 8,790 residents, 21.5% of the total. Together its 9 incorporated places hold 47.1% of those residents; the other 52.9% live outside any of them. Reported testing is thin here: 4 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 Sallisaw to Moffett, CDC publishes no figure by town: each reads Sequoyah County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Sallisaw | 8,790 | +3.0% | 21.5% |
| Roland | 4,146 | +22.4% | 10.2% |
| Muldrow | 3,375 | +3.6% | 8.3% |
| Vian | 1,386 | +0.5% | 3.4% |
| Gore | 996 | +0.8% | 2.4% |
| Gans | 253 | +2.8% | 0.6% |
| Marble City | 186 | +1.6% | 0.5% |
| Paradise Hill | 70 | Level | 0.2% |
| Moffett | 34 | Level | Under 0.1% |
9 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).
Sequoyah County, Homes
Homes in Sequoyah County
Of Sequoyah County's 18,254 homes, 72% are detached houses, against 73% across Oklahoma; 20% are mobile homes. Half of its homes were built before 1985, close to Oklahoma's 1980: 10% date from before 1960 and 24% from 2000 or later. 71% 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 | Sequoyah County | Oklahoma |
|---|---|---|
| Housing units | 18,254 | 1,763,036 |
| Detached houses | 72% | 73% |
| In buildings of 5 or more | 4% | 12% |
| Mobile homes | 20% | 9% |
| Built before 1960 | 10% | 21% |
| Built since 2000 | 24% | 25% |
| Middle year built | 1985 | 1980 |
| Owner-occupied | 71% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.