Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Bryan County, Oklahoma
EPA puts Bryan County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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
Nearest county
8.9%
Oklahoma County, 128 miles
- Oklahoma
- 8.9%
- Oklahoma
- 12.6%
Share at 4+ pCi/L, 135 tests, 2006 to 2015
Ground above low
54.3%
39.1 pts above Oklahoma
- Bryan
- 54.3%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Bryan
- 1
- Needed
- 30
2008 to 2017, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Bryan 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
Bryan County, At a glance
Bryan County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Moderate across 54% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Bryan County, 2008 to 2017, laboratory
CDC holds 1 reported test for Bryan County over the 2008 to 2017 laboratory totals, a result of 0.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Bryan County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Bryan 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).
Bryan County, Compared
Bryan County radon figures, compared
Calculated by Radon411CDC's largest figure for Bryan County rests on 1 test over the 2008 to 2017 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 0.6 pCi/L, with a middle value of 0.6 pCi/L.
The nearest counties with a figure are Oklahoma County (128 miles away) at 8.9%, Tulsa County (150 miles away) at 6.0% and Cherokee County (152 miles away) at 32.0%. 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 Bryan County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 54% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Bryan County, Geology
The ground under Bryan County
PredictedUSGS's geologic map splits Bryan County: 54.3% of its land is moderate radon potential and 45.8% low. The map puts 54.3% of Bryan County in the area it calls Cretaceous Gulfian series and 45.5% in Gulf Coast Plain. USGS gives the first a radon index of 10, 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 |
|---|---|---|---|---|
| Cretaceous Gulfian series | Cretaceous sandstone, shale, limestone, siltstone. | Moderate | 10 | 54.3% |
| Gulf Coast Plain | Cretaceous shale, nonmarine sand and clay and marine limestone and clay. | Low | 8 | 45.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Bryan County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Bryan County's is. Of the 7 counties that border it, 3 have more moderate-potential ground, Grayson County, TX the most at 85.4%.
The map rates the ground, not the air in any home.
Local help
Bryan County, Local resources
Radon testing and mitigation in Bryan 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
Bryan County, Questions
Questions about radon in Bryan County
Are radon levels high in Bryan County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Bryan County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. Of the 5 nearest counties with a figure, within 191 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Bryan County?
Bryan County borders 7 counties: Fannin County, TX, Marshall County, OK, Johnston County, OK, Grayson County, TX, Atoka County, OK, Choctaw County, OK and Lamar County, TX.
Products
Bryan County, Products
Testing a home in Bryan County
No CDC figure names Bryan County; the nearest county with one, Oklahoma County (128 miles away), reported 8.9% 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. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Bryan County.
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
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
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
Bryan County, Bordering counties
Counties bordering Bryan County
Calculated by Radon411- Radon levels in Choctaw County, OKEPA zone 3
100.0%at or above 4 pCi/L
Median 4.8 pCi/L · 2 tests
- Radon levels in Grayson County, TXEPA zone 3
6.7%at or above 4 pCi/L
Median 1.1 pCi/L · 15 tests
- Radon levels in Fannin County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 1 test
- Radon levels in Lamar County, TXEPA zone 3
0.0%at or above 4 pCi/L
Median 0.3 pCi/L · 6 tests
- Radon levels in Marshall County, OKEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Johnston County, OKEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Atoka County, OKEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Bryan County, Cities and towns
Cities and towns in Bryan County
Bryan County is growing: the Census Bureau puts it at 51,367 residents on July 1, 2025, up 10.9% from 46,326 in 2020. That works out to 57 people per square mile of land. Its largest town, Durant, has 21,552 residents, 42.0% of the total. Together its 13 incorporated places hold 57.3% of those residents; the other 42.7% live outside any of them. Reported testing is thin here: 1 test over 2008 to 2017, or under 0.1 for every 1,000 residents (2025 estimate), where Oklahoma as a whole comes to 0.2.
From Durant to Hendrix, CDC publishes no figure by town: each reads Bryan County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Durant | 21,552 | +15.1% | 42.0% |
| Calera | 3,145 | +7.7% | 6.1% |
| Colbert | 1,118 | +7.9% | 2.2% |
| Caddo | 1,093 | +7.2% | 2.1% |
| Bokchito | 631 | +7.7% | 1.2% |
| Achille | 434 | +8.0% | 0.8% |
| Silo | 413 | +6.7% | 0.8% |
| Bennington | 326 | +8.3% | 0.6% |
| Mead | 248 | +9.7% | 0.5% |
| Kenefic | 161 | +8.8% | 0.3% |
| Kemp | 135 | +8.0% | 0.3% |
| Armstrong | 123 | +8.8% | 0.2% |
- Hendrix
13 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).
Bryan County, Homes
Homes in Bryan County
Of Bryan County's 20,605 homes, 68% are detached houses, against 73% across Oklahoma; 18% are mobile homes. Much of Bryan County is recent building: 33% of its homes have gone up since 2000 and the middle year built is 1988, against 1980 for Oklahoma. 64% 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 | Bryan County | Oklahoma |
|---|---|---|
| Housing units | 20,605 | 1,763,036 |
| Detached houses | 68% | 73% |
| In buildings of 5 or more | 8% | 12% |
| Mobile homes | 18% | 9% |
| Built before 1960 | 14% | 21% |
| Built since 2000 | 33% | 25% |
| Middle year built | 1988 | 1980 |
| Owner-occupied | 64% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.