Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Tillman County, Oklahoma
EPA puts Tillman County in Zone 3, its lowest radon zone. 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, 118 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
- Tillman
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
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 Tillman 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
Tillman County, At a glance
Tillman 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
No CDC test figures here
CDC has published no radon test figures for Tillman County. Oklahoma County, 118 miles away, is the nearest county with a figure over the 2006 to 2015 laboratory totals.
Tillman County, Compared
Tillman County radon figures, compared
Calculated by Radon411No CDC figure names Tillman County, in any year or ten-year total; over the 2006 to 2015 laboratory totals, the agency's counts reach 53 Oklahoma counties without it. Pooled across 53 Oklahoma counties, 12.6% of reported tests reached that level; across every county in the country with a figure, 36.3%.
The nearest counties with a figure are Oklahoma County (118 miles away) at 8.9%, Tulsa County (207 miles away) at 6.0% and Washington County (235 miles away) at 11.3%. 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 Tillman 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.
Tillman County, Geology
The ground under Tillman County
PredictedUSGS's geologic map puts all of Tillman County's mapped land in one class: low radon potential. 97.0% 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 | 97.0% |
| Wichita Mountains | Granite, rhyolite, abd gabbro. | Low | 6 | 2.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Tillman County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Tillman 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
Tillman County, Local resources
Radon testing and mitigation in Tillman 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
Tillman County, Questions
Questions about radon in Tillman County
Are radon levels high in Tillman County?
No CDC testing statistics are published here for Tillman County, Oklahoma yet. Of the 5 nearest counties with a figure, within 272 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Tillman County?
Tillman County borders 6 counties: Wilbarger County, TX, Jackson County, OK, Comanche County, OK, Wichita County, TX, Cotton County, OK and Kiowa County, OK.
Products
Tillman County, Products
Testing a home in Tillman County
No CDC figure names Tillman County; the nearest county with one, Oklahoma County (118 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 Tillman 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
Wave Radon battery smart radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- App only
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Tillman County, Bordering counties
Counties bordering Tillman County
Calculated by Radon411- Radon levels in Comanche County, OKEPA zone 3
9.1%at or above 4 pCi/L
Median 0.6 pCi/L · 11 tests
- Radon levels in Wichita County, TXEPA zone 3
7.1%at or above 4 pCi/L
Median 0.8 pCi/L · 14 tests
- Radon levels in Jackson County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 3 tests
- Radon levels in Wilbarger County, TXEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Cotton County, OKEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Kiowa County, OKEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Tillman County, Cities and towns
Cities and towns in Tillman County
About 6,780 people live in Tillman County by the Census Bureau's estimate for July 1, 2025, 170 fewer than in 2020 (−2.4%). Spread over its land, that is 7.8 people to the square mile. Its largest town, Frederick, has 3,371 residents, 49.7% of the total. CDC publishes no radon test count for Tillman County; across Oklahoma its counts for 2006 to 2015 come to 0.2 tests for every 1,000 residents (2025 estimate).
From Frederick to Loveland, CDC publishes no figure by town: each reads Tillman County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Frederick | 3,371 | −2.9% | 49.7% |
| Grandfield | 889 | −2.5% | 13.1% |
| Tipton | 840 | −2.4% | 12.4% |
| Chattanoogaextends beyond Tillman County | 410 | +1.0% | Counted whole |
| Davidson | 238 | −1.7% | 3.5% |
| Manitou | 171 | −0.6% | 2.5% |
| Hollister | 38 | −2.6% | 0.6% |
| Loveland | 15 | Level | 0.2% |
8 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 Tillman County is counted whole, so it has no share.
Tillman County, Homes
Homes in Tillman County
Tillman County is a place of houses on their own lots: 90% of its 3,776 homes are detached single-family houses, against 73% across Oklahoma. The homes are older than Oklahoma's as a whole: half were built before 1963 (1980 for Oklahoma), and 45% date from before 1960. 75% 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 | Tillman County | Oklahoma |
|---|---|---|
| Housing units | 3,776 | 1,763,036 |
| Detached houses | 90% | 73% |
| In buildings of 5 or more | 3% | 12% |
| Mobile homes | 4% | 9% |
| Built before 1960 | 45% | 21% |
| Built since 2000 | 7% | 25% |
| Middle year built | 1963 | 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.