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 Sherman County, Kansas
EPA puts Sherman County in Zone 1, its highest radon zone, and only 9 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
61.1%
29.3 pts above KS
- Sherman
- 61.1%
- Kansas
- 31.8%
108 tests, 2021
Median result
5.0pCi/L
Action level reached
- Sherman
- 5.0 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2021
Tests reported
108
32nd of 62 by tests
- Sherman
- 108
- 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
6 of 62
Top quarter
- Sherman
- 61.1%
- Norton
- 93.8%
By share, of 62 with 30+ tests
Read a result for Sherman County
Starts at Sherman County's median, 5.0 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 5.0 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. Sherman County's median reported result, 2021.
The data
Sherman County, At a glance
Sherman County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Sherman 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 Sherman County, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2016 | 46.4% |
| 2017 | 55.3% |
| 2018 | 59.2% |
| 2019 | 58.7% |
| 2020 | 56.4% |
| 2021 | 61.1% |
| 2022 | 44.4% |
2022: 44.4%. Across these years the share ran from 44.4% to 61.1%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 9 tests were reported to CDC for Sherman 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).
Sherman County, Compared
Sherman County radon figures, compared
Calculated by Radon411More than half: 61.1% of the 108 radon tests reported to CDC for Sherman County in 2021 read at least 4 pCi/L. That places it 6th of 62 Kansas counties with 30 or more tests for the same period. That is 29.3 points above the 31.8% pooled from 96 Kansas counties.
The newest figure, in 2022, counts only 9 tests (44.4% at or above 4 pCi/L), too few to compare, so this reading uses the 108-test figure.
The median result, 5.0 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 16.8 pCi/L. The rest split 19.4% under 2 pCi/L and 19.4% from 2 to 4 (Kansas: 45.3% and 22.9%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 61.1% share point the same way here.
No bordering county with a figure for the same period reported a higher share; the closest is Thomas County at 56.3%, the lowest Logan County at 55.9%. Statewide for the same period, Norton County reported the highest share (93.8%) and Doniphan County the lowest (0.0%).
The busiest year on file was 2021, with 108 tests reported; the quietest, 2022, had 9.
Over 6 years of annual figures the share rose 14.7 points, from 46.4% in 2016 to 61.1% in 2021; its peak was 61.1% in 2021. Nationally, every county with a figure for the same period pools to 24.4%; Sherman County sits 36.7 points above it. CDC also counts 18 tests taken after mitigation in Sherman County for the same period: tests in homes where a fix was already in.
Sherman CountyKansas, pooled
61.1% % of tests31.8% % of tests
| Year | Tests | Sherman County, at or above 4 pCi/L | Kansas, pooled |
|---|---|---|---|
| 2016 | 69 | 46.4% | 35.4% |
| 2017 | 76 | 55.3% | 37.3% |
| 2018 | 49 | 59.2% | 37.3% |
| 2019 | 63 | 58.7% | 33.7% |
| 2020 | 39 | 56.4% | 31.3% |
| 2021 | 108 | 61.1% | 31.8% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sherman County, Geology
The ground under Sherman County
PredictedUSGS's geologic map puts all of Sherman County's mapped land in one class: high radon potential. All of it lies in the area the map calls Ogallala Formation, 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 |
|---|---|---|---|---|
| Ogallala Formation | Tertiary sandstone, in part covered by windblown eolian sand and 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.
Sherman County beside the ground around it
Sherman 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; Kit Carson County, CO comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Sherman County, Local resources
Radon testing and mitigation in Sherman 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
Sherman County, Questions
Questions about radon in Sherman County
Are radon levels high in Sherman County?
In 2022, 44.4% of the radon tests reported to CDC for Sherman County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.0 pCi/L. Of 62 Kansas counties with 30 or more tests for the same period, 5 reported a higher share; pooled, the state comes to 31.8%.
Which counties border Sherman County?
Sherman County borders 6 counties: Cheyenne County, KS, Thomas County, KS, Wallace County, KS, Rawlins County, KS, Logan County, KS and Kit Carson County, CO.
Products
Sherman County, Products
Testing a home in Sherman County
In Sherman County, 61.1% of 108 tests reported to CDC in 2021 reached 4 pCi/L, against 31.8% pooled across Kansas. In Zone 1 the year-round level in Sherman 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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
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
Sherman County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Sherman County
Explore
Sherman County, Bordering counties
Counties bordering Sherman County
Calculated by Radon411- Radon levels in Wallace County, KSEPA zone 1
100.0%at or above 4 pCi/L
Median 10.7 pCi/L · 6 tests · 38.9 points above Sherman County
- Radon levels in Kit Carson County, COEPA zone 1
77.8%at or above 4 pCi/L
Median 4.5 pCi/L · 9 tests · 16.7 points above Sherman County
- Radon levels in Thomas County, KSEPA zone 1
56.3%at or above 4 pCi/L
Median 4.2 pCi/L · 48 tests · 4.8 points below Sherman County
- Radon levels in Logan County, KSEPA zone 1
55.9%at or above 4 pCi/L
Median 4.6 pCi/L · 102 tests · 5.2 points below Sherman County
- Radon levels in Rawlins County, KSEPA zone 1
50.0%at or above 4 pCi/L
Median 3.8 pCi/L · 18 tests · 11.1 points below Sherman County
- Radon levels in Cheyenne County, KSEPA zone 1
No CDC figure for 2021; its page reads it against its own neighbours.
Sherman County, Cities and towns
Cities and towns in Sherman County
About 5,763 people live in Sherman County by the Census Bureau's estimate for July 1, 2025, 144 fewer than in 2020 (−2.4%). Spread over its land, that is 5.5 people to the square mile. Goodland alone is home to 4,366 of them, 75.8% of the total. Together its 2 incorporated places hold 78.3% of those residents; the other 21.7% live outside any of them. CDC's 108 reported tests for 2021 work out to 18.7 per 1,000 residents (2025 estimate), close to Kansas' 23.5.
From Goodland to Kanorado, CDC publishes no figure by town: each reads Sherman County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Goodland | 4,366 | −2.4% | 75.8% |
| Kanorado | 148 | −3.3% | 2.6% |
2 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).
Sherman County, Homes
Homes in Sherman County
Sherman County is a place of houses on their own lots: 84% of its 2,938 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1967 (1975 for Kansas), and 44% date from before 1960. 66% of occupied homes are lived in by their owner (Kansas: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Sherman County | Kansas |
|---|---|---|
| Housing units | 2,938 | 1,285,221 |
| Detached houses | 84% | 72% |
| In buildings of 5 or more | 3% | 13% |
| Mobile homes | 6% | 4% |
| Built before 1960 | 44% | 33% |
| Built since 2000 | 3% | 20% |
| Middle year built | 1967 | 1975 |
| Owner-occupied | 66% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.