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 Carter County, Oklahoma
EPA puts Carter County in Zone 3, its lowest radon zone, and only 7 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
Nearest county
8.9%
Oklahoma County, 90 miles
- Oklahoma
- 8.9%
- Oklahoma
- 12.6%
Share at 4+ pCi/L, 135 tests, 2006 to 2015
Ground above low
None
15.2 pts below Oklahoma
- Carter
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
8
Too few for a share
- Carter
- 8
- Needed
- 30
2006 to 2015, 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 Carter 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
Carter County, At a glance
Carter County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Carter County, 2008 to 2017, laboratory
CDC holds 7 reported tests for Carter County over the 2008 to 2017 laboratory totals, with a median of 1.2 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Carter County beside the counties around it is how this page reads it.
What these figures count
Only 7 tests were reported to CDC for Carter 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).
Carter County, Compared
Carter County radon figures, compared
Calculated by Radon411CDC's largest figure for Carter County rests on 8 tests over the 2006 to 2015 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 12.5 points and no rank or comparison is drawn from it. Results reached as high as 12.1 pCi/L, with a middle value of 1.5 pCi/L.
The nearest counties with a figure are Oklahoma County (90 miles away) at 8.9%, Tulsa County (150 miles away) at 6.0% and Cherokee County (173 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 Carter County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Carter County, Geology
The ground under Carter County
PredictedUSGS's geologic map puts all of Carter County's mapped land in one class: low radon potential. The map puts 90.5% of Carter County in the area it calls Central Oklahoma Plains and Hills and 9.5% in Gulf Coast Plain. USGS gives the first a radon index of 7 and the second 8, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Central Oklahoma Plains and Hills | Nonmarine Permian and Tertiary rocks, including shale, sandstone, and conglomerate in the western part, and Mississippian and Pennsylvanian rocks in the eastern part. | Low | 7 | 90.5% |
| Gulf Coast Plain | Cretaceous shale, nonmarine sand and clay and marine limestone and clay. | Low | 8 | 9.5% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Carter County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Carter County's is. None of the 7 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Carter County, Local resources
Radon testing and mitigation in Carter 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
Carter County, Questions
Questions about radon in Carter County
Are radon levels high in Carter County?
Over the 2008 to 2017 laboratory totals, 14.3% of the radon tests reported to CDC for Carter County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.2 pCi/L. Of the 5 nearest counties with a figure, within 204 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Carter County?
Carter County borders 7 counties: Murray County, Love County, Garvin County, Marshall County, Johnston County, Jefferson County and Stephens County.
Products
Carter County, Products
Testing a home in Carter County
No CDC figure names Carter County; the nearest county with one, Oklahoma County (90 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 Carter County.
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
MonitorAEGTEST
HOUND-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Carter County, Bordering counties
Counties bordering Carter County
Calculated by Radon411- Radon levels in Garvin CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.9 pCi/L · 1 test
- Radon levels in Jefferson CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 1 test
- Radon levels in Stephens CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 2 tests
- Radon levels in Murray CountyEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Love CountyEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Marshall CountyEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Johnston CountyEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Carter County, Cities and towns
Cities and towns in Carter County
The Census Bureau estimates 48,910 residents in Carter County for July 1, 2025, 870 more than in 2020 (+1.8%). That works out to 59 people per square mile of land. Ardmore alone is home to 24,956 of them, 51.0% of the total. Together its 9 incorporated places hold 74.4% of those residents; the other 25.6% live outside any of them. CDC's 8 reported tests for 2006 to 2015 work out to 0.2 per 1,000 residents (2025 estimate), close to Oklahoma's 0.2.
From Ardmore to Ratliff City, CDC publishes no figure by town: each reads Carter County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ardmore | 24,956 | +1.0% | 51.0% |
| Lone Grove | 5,244 | +4.7% | 10.7% |
| Healdton | 2,350 | Level | 4.8% |
| Wilson | 1,439 | +2.5% | 2.9% |
| Dickson | 1,363 | +2.3% | 2.8% |
| Springer | 701 | +2.2% | 1.4% |
| Gene Autry | 156 | +3.3% | 0.3% |
| Tatums | 118 | +2.6% | 0.2% |
| Ratliff City | 65 | Level | 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).
Carter County, Homes
Homes in Carter County
Carter County is a place of houses on their own lots: 77% of its 21,619 homes are detached single-family houses, against 73% across Oklahoma. Half of its homes were built before 1977, close to Oklahoma's 1980: 31% 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 | Carter County | Oklahoma |
|---|---|---|
| Housing units | 21,619 | 1,763,036 |
| Detached houses | 77% | 73% |
| In buildings of 5 or more | 4% | 12% |
| Mobile homes | 13% | 9% |
| Built before 1960 | 31% | 21% |
| Built since 2000 | 21% | 25% |
| Middle year built | 1977 | 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.