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 Alfalfa County, Oklahoma
EPA puts Alfalfa County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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, 96 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
- Alfalfa
- 0.0%
- Oklahoma
- 15.2%
Share of land USGS rates moderate or high potential
Tests reported
1
Too few for a share
- Alfalfa
- 1
- 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 Alfalfa 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
Alfalfa County, At a glance
Alfalfa 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 Alfalfa County, 2008 to 2017, laboratory
CDC holds 1 reported test for Alfalfa County over the 2008 to 2017 laboratory totals, a result of 29.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Alfalfa County beside the counties around it is how this page reads it.
What these figures count
Only 1 test was reported to CDC for Alfalfa 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: 2006 to 2017 (every CDC figure on file).
Alfalfa County, Compared
Alfalfa County radon figures, compared
Calculated by Radon411CDC's largest figure for Alfalfa County rests on 1 test over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 29.3 pCi/L, with a middle value of 29.3 pCi/L.
The nearest counties with a figure are Oklahoma County (96 miles away) at 8.9%, Washington County (134 miles away) at 11.3% and Tulsa County (139 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 Alfalfa 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.
Alfalfa County, Geology
The ground under Alfalfa County
PredictedUSGS's geologic map puts all of Alfalfa 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.
Alfalfa County beside the ground around it
Across Oklahoma 0.6% of the land is rated high; none of Alfalfa County's is. Of the 6 counties that border it, 2 have more high-potential ground, Barber County, KS the most at 22.9%.
The map rates the ground, not the air in any home.
Local help
Alfalfa County, Local resources
Radon testing and mitigation in Alfalfa 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
Alfalfa County, Questions
Questions about radon in Alfalfa County
Are radon levels high in Alfalfa County?
Over the 2008 to 2017 laboratory totals, 100.0% of the radon tests reported to CDC for Alfalfa County, Oklahoma were at or above 4 pCi/L, and the median reported pre-mitigation result was 29.3 pCi/L. Of the 5 nearest counties with a figure, within 197 miles, the share of tests at or above 4 pCi/L runs from 6.0% to 44.7%.
Which counties border Alfalfa County?
Alfalfa County borders 6 counties: Woods County, OK, Grant County, OK, Harper County, KS, Major County, OK, Barber County, KS and Garfield County, OK.
Products
Alfalfa County, Products
Testing a home in Alfalfa County
No CDC figure names Alfalfa County; the nearest county with one, Oklahoma County (96 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 Alfalfa 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
Corentium Home 2 battery digital radon monitor
- C-NRPP 2024/25: Not included
- Battery
- Bluetooth
- Screen, app
Method: Alpha spectrometry
Readings: Every 60 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Alfalfa County, Bordering counties
Counties bordering Alfalfa County
Calculated by Radon411- Radon levels in Grant County, OKEPA zone 3
50.0%at or above 4 pCi/L
Median 4.0 pCi/L · 6 tests
- Radon levels in Woods County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 1.8 pCi/L · 1 test
- Radon levels in Major County, OKEPA zone 3
0.0%at or above 4 pCi/L
Median 2.7 pCi/L · 2 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 Harper County, KSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Barber County, KSEPA zone 2
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
Alfalfa County, Cities and towns
Cities and towns in Alfalfa County
About 5,649 people live in Alfalfa County by the Census Bureau's estimate for July 1, 2025, 64 fewer than in 2020 (−1.1%). Spread over its land, that is 6.5 people to the square mile. Its largest town, Helena, has 1,527 residents, 27.0% of the total. Together its 10 incorporated places hold 73.1% of those residents; the other 26.9% live outside any of them. CDC's 1 reported test for 2008 to 2017 work out to 0.2 per 1,000 residents (2025 estimate), close to Oklahoma's 0.2.
From Helena to Lambert, CDC publishes no figure by town: each reads Alfalfa County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Helena | 1,527 | −0.3% | 27.0% |
| Cherokee | 1,439 | −2.2% | 25.5% |
| Carmen | 354 | −1.9% | 6.3% |
| Goltry | 248 | −1.2% | 4.4% |
| Jet | 193 | −1.5% | 3.4% |
| Aline | 168 | −1.2% | 3.0% |
| Burlington | 118 | −1.7% | 2.1% |
| Amorita | 39 | Level | 0.7% |
| Byron | 39 | −2.5% | 0.7% |
| Lambert | 6 | Level | 0.1% |
10 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).
Alfalfa County, Homes
Homes in Alfalfa County
Alfalfa County is a place of houses on their own lots: 87% of its 2,480 homes are detached single-family houses, against 73% across Oklahoma. The homes are older than Oklahoma's as a whole: half were built before 1960 (1980 for Oklahoma), and 50% date from before 1960. Owners live in 79% of the occupied homes (Oklahoma: 66%), so for most households a test and a fix are their own to order.
| Homes | Alfalfa County | Oklahoma |
|---|---|---|
| Housing units | 2,480 | 1,763,036 |
| Detached houses | 87% | 73% |
| In buildings of 5 or more | 1% | 12% |
| Mobile homes | 9% | 9% |
| Built before 1960 | 50% | 21% |
| Built since 2000 | 10% | 25% |
| Middle year built | 1960 | 1980 |
| Owner-occupied | 79% | 66% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.