Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Locations and reports
Radon Levels in Ellsworth County, Kansas
EPA puts Ellsworth County in Zone 1, its highest radon zone, and only 17 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
Share at 4+ pCi/L
35.2%
3.4 pts above KS
- Ellsworth
- 35.2%
- Kansas
- 31.8%
162 tests, 2021
Median result
2.9pCi/L
Below action level
- Ellsworth
- 2.9 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2021
Tests reported
162
30th of 62 by tests
- Ellsworth
- 162
- Johnson
- 25,860
Reported to CDC before any fix, 2021
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Kansas
33 of 62
Middle half
- Ellsworth
- 35.2%
- Norton
- 93.8%
By share, of 62 with 30+ tests
Read a result for Ellsworth County
Starts at Ellsworth County's median, 2.9 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.9 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Ellsworth County's median reported result, 2021.
The data
Ellsworth County, At a glance
Ellsworth County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Ellsworth County in
USGS geologic potential: High across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Ellsworth County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 64.3% |
| 2017 | 54.2% |
| 2018 | 66.7% |
| 2019 | 41.0% |
| 2020 | 53.6% |
| 2021 | 35.2% |
| 2022 | 35.3% |
2022: 35.3%. Across these years the share ran from 35.2% to 66.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 17 tests were reported to CDC for Ellsworth 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).
Ellsworth County, Compared
Ellsworth County radon figures, compared
Calculated by Radon411In Ellsworth County, about 4 in 10 reported tests in 2021 (57 of 162) were at or above EPA's action level. Against the national pool of 24.4%, the gap is 10.8 points higher. Across 96 Kansas counties pooled together, 31.8% of tests reached that level, so Ellsworth County runs 3.4 points above its state.
The newest figure, in 2022, counts only 17 tests (35.3% at or above 4 pCi/L), too few to compare, so this reading uses the 162-test figure.
Of 6 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 25.4% (Barton County) to 63.6% (Lincoln County). By share, Ellsworth County is 33rd of 62 Kansas counties with 30 or more tests for the same period.
Year by year, 2017 opened at 54.2% and 2021 closed at 35.2% (down 19.0 points), with 2017 the high at 54.2%. Half the tests came in under 2.9 pCi/L and half over it; the single highest reached 16.8 pCi/L. Below the action level, 54 tests (33.3%) came in under 2 pCi/L, against 45.3% statewide, and 51 tests (31.5%) fell between 2 and 4, against 22.9% statewide.
Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 35.2% share point the same way here. USGS geology rates 100% of the county's land high radon potential. CDC also counts 12 tests taken after mitigation in Ellsworth County for the same period: tests in homes where a fix was already in.
The busiest year on file was 2021, with 162 tests reported; the quietest, 2016, had 14.
Ellsworth CountyKansas, pooled
| Year | Tests | Ellsworth County, at or above 4 pCi/L | Kansas, pooled |
|---|---|---|---|
| 2017 | 59 | 54.2% | 37.3% |
| 2019 | 39 | 41.0% | 33.7% |
| 2021 | 162 | 35.2% | 31.8% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Ellsworth County, Geology
The ground under Ellsworth County
PredictedUSGS's geologic map puts all of Ellsworth County's mapped land in one class: high radon potential. All of it lies in the area the map calls Smoky Hills, to which USGS gives a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Smoky Hills | Cretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits. | High | 12 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Ellsworth County beside the ground around it
Ellsworth County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Lincoln County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Ellsworth County, Local resources
Radon testing and mitigation in Ellsworth 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
Ellsworth County, Questions
Questions about radon in Ellsworth County
Are radon levels high in Ellsworth County?
In 2022, 35.3% of the radon tests reported to CDC for Ellsworth County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 62 Kansas counties with 30 or more tests for the same period, 32 reported a higher share; pooled, the state comes to 31.8%.
Which counties border Ellsworth County?
Ellsworth County borders 6 counties: Rice County, Lincoln County, Saline County, Barton County, McPherson County and Russell County.
Products
Ellsworth County, Products
Testing a home in Ellsworth County
In Ellsworth County, 35.2% of 162 tests reported to CDC in 2021 reached 4 pCi/L, against 31.8% pooled across Kansas. In Zone 1 the year-round level in Ellsworth County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.
Test kits and monitors3
See every kit and monitor
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
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
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Ellsworth County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Ellsworth County
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Ellsworth County, Bordering counties
Counties bordering Ellsworth County
Calculated by Radon411- Radon levels in Lincoln CountyEPA zone 1
63.6%at or above 4 pCi/L
Median 4.5 pCi/L · 33 tests · 28.4 points above Ellsworth County
- Radon levels in Russell CountyEPA zone 1
56.3%at or above 4 pCi/L
Median 4.8 pCi/L · 48 tests · 21.1 points above Ellsworth County
- Radon levels in Rice CountyEPA zone 1
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 66 tests · 14.8 points above Ellsworth County
- Radon levels in McPherson CountyEPA zone 1
44.2%at or above 4 pCi/L
Median 3.2 pCi/L · 651 tests · 9.0 points above Ellsworth County
- Radon levels in Saline CountyEPA zone 1
37.0%at or above 4 pCi/L
Median 2.8 pCi/L · 1,920 tests · 1.8 points above Ellsworth County
- Radon levels in Barton CountyEPA zone 1
25.4%at or above 4 pCi/L
Median 0.9 pCi/L · 402 tests · 9.8 points below Ellsworth County
Ellsworth County, Cities and towns
Cities and towns in Ellsworth County
About 6,257 people live in Ellsworth County by the Census Bureau's estimate for July 1, 2025, 110 fewer than in 2020 (−1.7%). Spread over its land, that is 8.7 people to the square mile. Its largest town, Ellsworth, has 3,092 residents, 49.4% of the total. Together its 5 incorporated places hold 77.7% of those residents; the other 22.3% live outside any of them. CDC's 162 reported tests for 2021 work out to 25.9 per 1,000 residents (2025 estimate), close to Kansas' 23.5.
From Ellsworth to Lorraine, CDC publishes no figure by town: each reads Ellsworth County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Ellsworth | 3,092 | +0.6% | 49.4% |
| Wilson | 826 | −2.8% | 13.2% |
| Kanopolis | 432 | −2.7% | 6.9% |
| Holyrood | 382 | −4.5% | 6.1% |
| Lorraine | 130 | −5.1% | 2.1% |
5 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).
Ellsworth County, Homes
Homes in Ellsworth County
Ellsworth County is a place of houses on their own lots: 83% of its 3,110 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1961 (1975 for Kansas), and 49% date from before 1960. Owners live in 82% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.
| Homes | Ellsworth County | Kansas |
|---|---|---|
| Housing units | 3,110 | 1,285,221 |
| Detached houses | 83% | 72% |
| In buildings of 5 or more | 4% | 13% |
| Mobile homes | 10% | 4% |
| Built before 1960 | 49% | 33% |
| Built since 2000 | 10% | 20% |
| Middle year built | 1961 | 1975 |
| Owner-occupied | 82% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.