Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Grant County, Oklahoma
EPA puts Grant County in Zone 3, its lowest 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
Nearest county
8.9%
Oklahoma County, 88 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
- Grant
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
6
Too few for a share
- Grant
- 6
- 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 Grant 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
Grant County, At a glance
Grant 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 Grant County, 2008 to 2017, laboratory
CDC holds 4 reported tests for Grant County over the 2008 to 2017 laboratory totals, with a median of 2.5 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Grant County beside the counties around it is how this page reads it.
What these figures count
Only 4 tests were reported to CDC for Grant 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).
Grant County, Compared
Grant County radon figures, compared
Calculated by Radon411CDC's largest figure for Grant County rests on 6 tests over the 2006 to 2015 laboratory totals, 3 of them at or above 4 pCi/L, so each test moves its share by 16.7 points and no rank or comparison is drawn from it. Results reached as high as 16.2 pCi/L, with a middle value of 4.0 pCi/L.
The nearest counties with a figure are Oklahoma County (88 miles away) at 8.9%, Washington County (105 miles away) at 11.3% and Tulsa County (113 miles away) at 6.0%. 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 Grant 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.
Grant County, Geology
The ground under Grant County
PredictedUSGS's geologic map puts all of Grant 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.
Grant County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Grant County's is. Of the 6 counties that border it, 1 has more high-potential ground, Harper County, KS the most at 5.8%.
The map rates the ground, not the air in any home.
Local help
Grant County, Local resources
Radon testing and mitigation in Grant 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
Grant County, Questions
Questions about radon in Grant County
Are radon levels high in Grant County?
Over the 2008 to 2017 laboratory totals, 25.0% of the radon tests reported to CDC for Grant County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.5 pCi/L. Of the 5 nearest counties with a figure, within 168 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Grant County?
Grant County borders 6 counties: Alfalfa County, OK, Harper County, KS, Sumner County, KS, Garfield County, OK, Kay County, OK and Noble County, OK.
Products
Grant County, Products
Testing a home in Grant County
No CDC figure names Grant County; the nearest county with one, Oklahoma County (88 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 Grant 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
MonitorX-Sense
XR0A-iR Wi-Fi battery radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Wi-Fi
- Screen, app
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Grant County, Bordering counties
Counties bordering Grant County
Calculated by Radon411- Radon levels in Alfalfa County, OKEPA zone 3
100.0%at or above 4 pCi/L
Median 29.3 pCi/L · 1 test
- Radon levels in Kay County, OKEPA zone 3
27.6%at or above 4 pCi/L
Median 2.5 pCi/L · 29 tests
- Radon levels in Garfield County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 2.0 pCi/L · 7 tests
- Radon levels in Noble County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 1.1 pCi/L · 1 test
- Radon levels in Harper County, KSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Sumner County, KSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Grant County, Cities and towns
Cities and towns in Grant County
About 4,067 people live in Grant County by the Census Bureau's estimate for July 1, 2025, 119 fewer than in 2020 (−2.8%). Spread over its land, that is 4.1 people to the square mile. Its largest town, Medford, has 901 residents, 22.2% of the total. Together its 9 incorporated places hold 67.9% of those residents; the other 32.1% live outside any of them. Testing is reported here more often than across the state: CDC's 6 reported tests for 2006 to 2015 come to 1.5 for every 1,000 residents (2025 estimate), against 0.2 for Oklahoma.
From Medford to Jefferson, CDC publishes no figure by town: each reads Grant County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Medford | 901 | −3.6% | 22.2% |
| Pond Creek | 878 | −1.9% | 21.6% |
| Wakita | 304 | −3.2% | 7.5% |
| Lamont | 293 | −3.6% | 7.2% |
| Nash | 183 | −2.7% | 4.5% |
| Manchester | 92 | +1.1% | 2.3% |
| Deer Creek | 78 | −2.5% | 1.9% |
| Renfrow | 20 | −4.8% | 0.5% |
| Jefferson | 11 | Level | 0.3% |
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).
Grant County, Homes
Homes in Grant County
Grant County is a place of houses on their own lots: 88% of its 2,175 homes are detached single-family houses, against 73% across Oklahoma. The homes are older than Oklahoma's as a whole: half were built before 1967 (1980 for Oklahoma), and 43% date from before 1960. 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 | Grant County | Oklahoma |
|---|---|---|
| Housing units | 2,175 | 1,763,036 |
| Detached houses | 88% | 73% |
| In buildings of 5 or more | 1% | 12% |
| Mobile homes | 8% | 9% |
| Built before 1960 | 43% | 21% |
| Built since 2000 | 13% | 25% |
| Middle year built | 1967 | 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.