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 McClain County, Oklahoma
EPA puts McClain County in Zone 3, its lowest radon zone, and only 5 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, 37 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
- McClain
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
5
Too few for a share
- McClain
- 5
- 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 McClain 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
McClain County, At a glance
McClain 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 McClain County, 2008 to 2017, laboratory
CDC holds 5 reported tests for McClain County over the 2008 to 2017 laboratory totals, with a median of 1.7 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). McClain County beside the counties around it is how this page reads it.
What these figures count
Only 5 tests were reported to CDC for McClain 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).
McClain County, Compared
McClain County radon figures, compared
Calculated by Radon411CDC's largest figure for McClain County rests on 5 tests over the 2008 to 2017 laboratory totals, 2 of them at or above 4 pCi/L, so each test moves its share by 20.0 points and no rank or comparison is drawn from it. Results reached as high as 7.3 pCi/L, with a middle value of 1.7 pCi/L.
The nearest counties with a figure are Oklahoma County (37 miles away) at 8.9%, Tulsa County (114 miles away) at 6.0% and Washington County (146 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 McClain 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.
McClain County, Geology
The ground under McClain County
PredictedUSGS's geologic map puts all of McClain 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.
McClain County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of McClain 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
McClain County, Local resources
Radon testing and mitigation in McClain 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
McClain County, Questions
Questions about radon in McClain County
Are radon levels high in McClain County?
Over the 2008 to 2017 laboratory totals, 40.0% of the radon tests reported to CDC for McClain County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 pCi/L. Of the 5 nearest counties with a figure, within 177 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border McClain County?
McClain County borders 6 counties: Cleveland County, Grady County, Pottawatomie County, Garvin County, Canadian County and Pontotoc County.
Products
McClain County, Products
Testing a home in McClain County
No CDC figure names McClain County; the nearest county with one, Oklahoma County (37 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 McClain 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
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
McClain County, Bordering counties
Counties bordering McClain 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 Pottawatomie CountyEPA zone 3
9.1%at or above 4 pCi/L
Median 0.1 pCi/L · 11 tests
- Radon levels in Cleveland CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.9 pCi/L · 20 tests
- Radon levels in Grady CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 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 Pontotoc CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 3 tests
McClain County, Cities and towns
Cities and towns in McClain County
McClain County is growing: the Census Bureau puts it at 49,647 residents on July 1, 2025, up 18.4% from 41,922 in 2020. That works out to 87 people per square mile of land. Its largest town, Newcastle, has 15,198 residents, 30.6% of the total. Reported testing is thin here: 5 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 Newcastle to Rosedale, CDC publishes no figure by town: each reads McClain County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Newcastle | 15,198 | +36.0% | 30.6% |
| Blanchardextends beyond McClain County | 10,013 | +12.7% | Counted whole |
| Purcellextends beyond McClain County | 7,030 | +5.8% | Counted whole |
| Goldsby | 3,591 | +32.4% | 7.2% |
| Maysvilleextends beyond McClain County | 1,096 | +1.8% | Counted whole |
| Dibble | 992 | +13.0% | 2.0% |
| Washington | 780 | +10.6% | 1.6% |
| Wayne | 690 | +10.4% | 1.4% |
| Cole | 669 | +7.2% | 1.3% |
| Byars | 209 | +10.6% | 0.4% |
| Rosedale | 68 | +7.9% | 0.1% |
11 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). A place that extends beyond McClain County is counted whole, so it has no share.
McClain County, Homes
Homes in McClain County
McClain County is a place of houses on their own lots: 82% of its 17,125 homes are detached single-family houses, against 73% across Oklahoma. Much of McClain County is recent building: 45% of its homes have gone up since 2000 and the middle year built is 1996, against 1980 for Oklahoma. Owners live in 78% of the occupied homes (Oklahoma: 66%), so for most households a test and a fix are their own to order.
| Homes | McClain County | Oklahoma |
|---|---|---|
| Housing units | 17,125 | 1,763,036 |
| Detached houses | 82% | 73% |
| In buildings of 5 or more | 4% | 12% |
| Mobile homes | 11% | 9% |
| Built before 1960 | 9% | 21% |
| Built since 2000 | 45% | 25% |
| Middle year built | 1996 | 1980 |
| Owner-occupied | 78% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.