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 Greenwood County, Kansas
EPA puts Greenwood County in Zone 2, its middle radon zone, and only 6 radon tests from it are on file with CDC (2022). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
38.0%
Lyon County
- Lyon
- 38.0%
- Butler
- 27.8%
2 of 7 neighbours have 30+ tests, 2019
Nearest county
27.8%
Butler County, 34 miles
- Butler
- 27.8%
- Kansas
- 33.7%
Share at 4+ pCi/L, 511 tests, 2019
Ground above low
100.0%
Level with Kansas
- Greenwood
- 100.0%
- Kansas
- 100.0%
Share of land USGS rates moderate or high potential
Tests reported
14
Too few for a share
- Greenwood
- 14
- Needed
- 30
2017
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Read a result for Greenwood 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
Greenwood County, At a glance
Greenwood County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Greenwood County is a
USGS geologic potential: Moderate across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Greenwood County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 0.0% |
| 2017 | 42.9% |
| 2018 | 42.9% |
| 2019 | 16.7% |
| 2020 | 50.0% |
| 2021 | 25.0% |
| 2022 | 16.7% |
2022: 16.7%. Across these years the share ran from 0.0% to 50.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 6 tests were reported to CDC for Greenwood County over 2022, 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: 2022. Measured data period: 2016 to 2022 (every CDC figure on file).
Greenwood County, Compared
Greenwood County radon figures, compared
Calculated by Radon411CDC's largest figure for Greenwood County rests on 14 tests in 2017, 6 of them at or above 4 pCi/L, so each test moves its share by 7.1 points and no rank or comparison is drawn from it. Results reached as high as 12.4 pCi/L, with a middle value of 3.8 pCi/L.
Of the counties bordering it, 2 have a figure in 2019: Lyon County reported the largest share at or above 4 pCi/L, 38.0%, and Butler County the smallest, 27.8%. Farther out, Cowley County (55 miles away) at 41.6%, Marion County (58 miles away) at 35.1% and Osage County (60 miles away) at 31.0% have figures too. Pooled across 102 Kansas counties, 33.7% of reported tests reached that level; across every county in the country with a figure, 29.0%.
Statewide for the same period, Jewell County reported the highest share (71.9%) and Reno County the lowest (20.8%). EPA's 1993 map puts Greenwood County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Greenwood County, Geology
The ground under Greenwood County
PredictedUSGS's geologic map puts all of Greenwood County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Glaciated Area, to which USGS gives a radon index of 9, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Glaciated Area | Glacial till underlain by Pennsylvanian and Permian marine and nonmarine sedimentary shale, sandstone, limestone, coal. | Moderate | 9 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Greenwood County beside the ground around it
Across Kansas 59.9% of the land is rated high; none of Greenwood County's is. Of the 7 counties that border it, none has as large a share of moderate-potential ground; Butler County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Greenwood County, Local resources
Radon testing and mitigation in Greenwood County
- Kansas Radon ProgramKansas Radon Program answers questions about testing, mitigation and the rules in Kansas.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
- Professionals in Kansas178 professionals are listed in Kansas.
What Kansas's program says
- Phone
- (800) 693-5343
What it means
Greenwood County, Questions
Questions about radon in Greenwood County
Are radon levels high in Greenwood County?
In 2022, 16.7% of the radon tests reported to CDC for Greenwood County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of the counties bordering it, 2 have a figure in 2019: Lyon County reported the largest share at or above 4 pCi/L, 38.0%, and Butler County the smallest, 27.8%.
Which counties border Greenwood County?
Greenwood County borders 7 counties: Woodson County, Elk County, Chase County, Butler County, Coffey County, Wilson County and Lyon County.
Products
Greenwood County, Products
Testing a home in Greenwood County
No CDC figure names Greenwood County; the nearest county with one, Butler County (34 miles away), reported 27.8% of its tests at or above 4 pCi/L in 2019, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Greenwood County; a long-term test tells the year-round average.
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
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Greenwood County, Bordering counties
Counties bordering Greenwood County
Calculated by Radon411- Radon levels in Elk CountyEPA zone 2
50.0%at or above 4 pCi/L
Median 7.2 pCi/L · 2 tests
- Radon levels in Chase CountyEPA zone 2
50.0%at or above 4 pCi/L
Median 4.5 pCi/L · 4 tests
- Radon levels in Lyon CountyEPA zone 2
38.0%at or above 4 pCi/L
Median 2.7 pCi/L · 50 tests
- Radon levels in Butler CountyEPA zone 2
27.8%at or above 4 pCi/L
Median 2.3 pCi/L · 511 tests
- Radon levels in Coffey CountyEPA zone 2
16.7%at or above 4 pCi/L
Median 2.1 pCi/L · 12 tests
- Radon levels in Woodson CountyEPA zone 2
0.0%at or above 4 pCi/L
Median 2.4 pCi/L · 2 tests
- Radon levels in Wilson CountyEPA zone 2
No CDC figure for 2019; its page reads it against its own neighbours.
Greenwood County, Cities and towns
Cities and towns in Greenwood County
About 5,826 people live in Greenwood County by the Census Bureau's estimate for July 1, 2025, 135 fewer than in 2020 (−2.3%). Spread over its land, that is 5.1 people to the square mile. Its largest town, Eureka, has 2,239 residents, 38.4% of the total. Together its 7 incorporated places hold 59.9% of those residents; the other 40.1% live outside any of them. Reported testing is thin here: 14 tests over 2017, or 2.4 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 8.0.
From Eureka to Virgil, CDC publishes no figure by town: each reads Greenwood County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Eureka | 2,239 | −2.5% | 38.4% |
| Madison | 663 | −3.2% | 11.4% |
| Severy | 196 | −1.5% | 3.4% |
| Hamilton | 174 | −2.2% | 3.0% |
| Fall River | 126 | −2.3% | 2.2% |
| Climax | 45 | −2.2% | 0.8% |
| Virgil | 45 | −2.2% | 0.8% |
7 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).
Greenwood County, Homes
Homes in Greenwood County
Greenwood County is a place of houses on their own lots: 86% of its 3,682 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1958 (1975 for Kansas), and 53% date from before 1960. Owners live in 79% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.
| Homes | Greenwood County | Kansas |
|---|---|---|
| Housing units | 3,682 | 1,285,221 |
| Detached houses | 86% | 72% |
| In buildings of 5 or more | 2% | 13% |
| Mobile homes | 8% | 4% |
| Built before 1960 | 53% | 33% |
| Built since 2000 | 12% | 20% |
| Middle year built | 1958 | 1975 |
| Owner-occupied | 79% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.