Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in Grady County, Oklahoma
EPA puts Grady County in Zone 3, its lowest radon zone, and only 3 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, 46 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
- Grady
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
4
Too few for a share
- Grady
- 4
- Needed
- 30
2005 to 2014, 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 Grady 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
Grady County, At a glance
Grady 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 Grady County, 2008 to 2017, laboratory
CDC holds 3 reported tests for Grady County over the 2008 to 2017 laboratory totals, with a median of 1.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Grady County beside the counties around it is how this page reads it.
What these figures count
Only 3 tests were reported to CDC for Grady 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).
Grady County, Compared
Grady County radon figures, compared
Calculated by Radon411CDC's largest figure for Grady County rests on 4 tests over the 2005 to 2014 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 1.0 pCi/L, with a middle value of 0.5 pCi/L.
The nearest counties with a figure are Oklahoma County (46 miles away) at 8.9%, Tulsa County (133 miles away) at 6.0% and Washington County (161 miles away) at 11.3%. 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 Grady 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.
Grady County, Geology
The ground under Grady County
PredictedUSGS's geologic map puts all of Grady County's mapped land in one class: low radon potential. All of it lies in the area the map calls Central Oklahoma Plains and Hills, to which USGS gives a radon index of 7, 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Grady County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Grady County's is. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Grady County, Local resources
Radon testing and mitigation in Grady 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
Grady County, Questions
Questions about radon in Grady County
Are radon levels high in Grady County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Grady County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of the 5 nearest counties with a figure, within 198 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Grady County?
Grady County borders 6 counties: McClain County, Caddo County, Canadian County, Stephens County, Garvin County and Comanche County.
Products
Grady County, Products
Testing a home in Grady County
No CDC figure names Grady County; the nearest county with one, Oklahoma County (46 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 Grady 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
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- Bluetooth
- Alarm
- Screen, app
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
Grady County, Bordering counties
Counties bordering Grady County
Calculated by Radon411- Radon levels in Canadian CountyEPA zone 3
19.0%at or above 4 pCi/L
Median 0.6 pCi/L · 21 tests
- Radon levels in Comanche CountyEPA zone 3
9.1%at or above 4 pCi/L
Median 0.6 pCi/L · 11 tests
- Radon levels in McClain CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.5 pCi/L · 3 tests
- 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 Garvin CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.9 pCi/L · 1 test
- Radon levels in Caddo CountyEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Grady County, Cities and towns
Cities and towns in Grady County
Grady County is growing: the Census Bureau puts it at 59,128 residents on July 1, 2025, up 7.7% from 54,889 in 2020. That works out to 54 people per square mile of land. Its largest town, Chickasha, has 17,313 residents, 29.3% of the total. Reported testing is thin here: 4 tests over 2005 to 2014, or 0.1 for every 1,000 residents (2025 estimate), where Oklahoma as a whole comes to 0.2.
From Chickasha to Bradley, CDC publishes no figure by town: each reads Grady County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Chickasha | 17,313 | +8.2% | 29.3% |
| Blanchardextends beyond Grady County | 10,013 | +12.7% | Counted whole |
| Tuttle | 8,708 | +17.8% | 14.7% |
| Minco | 1,580 | +4.4% | 2.7% |
| Rush Springs | 1,020 | +3.2% | 1.7% |
| Ninnekah | 833 | +6.3% | 1.4% |
| Verden | 521 | +2.4% | 0.9% |
| Alex | 513 | +5.3% | 0.9% |
| Amber | 466 | +12.0% | 0.8% |
| Bridge Creek | 316 | +3.6% | 0.5% |
| Pocasset | 196 | +4.8% | 0.3% |
| Norge | 126 | +8.6% | 0.2% |
- Bradley
13 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Grady County is counted whole, so it has no share.
Grady County, Homes
Homes in Grady County
Grady County is a place of houses on their own lots: 79% of its 23,332 homes are detached single-family houses, against 73% across Oklahoma. Half of its homes were built before 1981, close to Oklahoma's 1980: 24% date from before 1960 and 27% from 2000 or later. Owners live in 75% of the occupied homes (Oklahoma: 66%), so for most households a test and a fix are their own to order.
| Homes | Grady County | Oklahoma |
|---|---|---|
| Housing units | 23,332 | 1,763,036 |
| Detached houses | 79% | 73% |
| In buildings of 5 or more | 5% | 12% |
| Mobile homes | 13% | 9% |
| Built before 1960 | 24% | 21% |
| Built since 2000 | 27% | 25% |
| Middle year built | 1981 | 1980 |
| Owner-occupied | 75% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.