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 Sherman County, Nebraska
EPA puts Sherman County in Zone 2, its middle radon zone, and only 3 radon tests from it are on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
59.8%
15.5 pts above NE
- Sherman
- 59.8%
- Nebraska
- 44.3%
396 tests, 2019
Median result
4.7pCi/L
Action level reached
- Sherman
- 4.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2019
Tests reported
396
20th of 71 by tests
- Sherman
- 396
- Douglas
- 15,510
Reported to CDC before any fix, 2019
EPA radon zone
Zone 2
Moderate potential
- 1
- Zone 2
- 3
1 highest, 3 lowest
EPA predicts 2 to 4 pCi/L indoors
Rank in Nebraska
23 of 71
Middle half
- Sherman
- 59.8%
- Dixon
- 77.8%
By share, of 71 with 30+ tests
Read a result for Sherman County
Starts at Sherman County's median, 4.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.7 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, 2019.
The data
Sherman County, At a glance
Sherman County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Sherman 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 Sherman County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 60.0% |
| 2015 | 61.1% |
| 2016 | 53.1% |
| 2017 | 25.0% |
| 2018 | 62.5% |
| 2019 | 59.8% |
| 2020 | 41.2% |
| 2021 | 70.0% |
| 2022 | 50.0% |
| 2023 | 100.0% |
2023: 100.0%. Across these years the share ran from 25.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 3 tests were reported to CDC for Sherman County over 2023, 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: 2023. Measured data period: 2005 to 2023 (every CDC figure on file).
Sherman County, Compared
Sherman County radon figures, compared
Calculated by Radon411More than half: 59.8% of the 396 radon tests reported to CDC for Sherman County in 2019 read at least 4 pCi/L. That places it 23rd of 71 Nebraska counties with 30 or more tests for the same period. That is 15.5 points above the 44.3% pooled from 89 Nebraska counties.
The newest figure, in 2023, counts only 3 tests (100.0% at or above 4 pCi/L), too few to compare, so this reading uses the 396-test figure.
The median result, 4.7 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 20.3 pCi/L. The rest split 17.4% under 2 pCi/L and 22.7% from 2 to 4 (Nebraska: 29.4% and 26.4%). The reported tests do not follow EPA's Zone 2 label for Sherman County (predicted average between 2 and 4 pCi/L): 59.8% of them reached 4 pCi/L, fewer than that label suggests.
1 of its 5 bordering counties with figures ran higher, led by Greeley County at 61.5%; Buffalo County reported 43.8%. Statewide for the same period, Dixon County reported the highest share (77.8%) and Merrick County the lowest (3.4%).
The busiest year on file was 2019, with 396 tests reported; the quietest, 2023, had 3.
Over 8 years of annual figures the share rose 10.0 points, from 60.0% in 2014 to 70.0% in 2021; its peak was 70.0% in 2021. Nationally, every county with a figure for the same period pools to 29.0%; Sherman County sits 30.8 points above it.
Sherman CountyNebraska, pooled
70.0% % of tests34.9% % of tests
| Year | Tests | Sherman County, at or above 4 pCi/L | Nebraska, pooled |
|---|---|---|---|
| 2014 | 60 | 60.0% | 50.5% |
| 2015 | 108 | 61.1% | 53.3% |
| 2016 | 96 | 53.1% | 47.4% |
| 2017 | 36 | 25.0% | 47.7% |
| 2018 | 72 | 62.5% | 44.5% |
| 2019 | 396 | 59.8% | 44.3% |
| 2020 | 51 | 41.2% | 42.2% |
| 2021 | 30 | 70.0% | 34.9% |
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: moderate radon potential. All of it lies in the area the map calls Loess over Tertiary sediments, to which USGS gives a radon index of 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Loess over Tertiary sediments | Tertiary bedrock covered by varying thicknesses of loess. | Moderate | 11 | 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
Across Nebraska 40.9% of the land is rated high; none of Sherman County's is. Of the 5 counties that border it, 3 have more high-potential ground, Greeley County the most at 81.3%.
The map rates the ground, not the air in any home.
Local help
Sherman County, Local resources
Radon testing and mitigation in Sherman County
- Office of Environmental Health Hazards & Indoor AirOffice of Environmental Health Hazards & Indoor Air, run by Nebraska Department of Health and Human Services, licenses or certifies radon professionals and offers free or discounted test kits, and answers questions about testing and mitigation in Nebraska.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Some local programs distribute radon kits for free or a reduced cost.
- Compare kits
- Professionals in Nebraska116 professionals are listed in Nebraska.
What Nebraska's program says
- Phone
- (402) 471-1005
- Licensing of radon professionals
If radon testing is done in schools, offices, or other places of work, it must be done by a licensed radon measurement business.
What it means
Sherman County, Questions
Questions about radon in Sherman County
Are radon levels high in Sherman County?
In 2023, 100.0% of the radon tests reported to CDC for Sherman County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 10.8 pCi/L. Of 71 Nebraska counties with 30 or more tests for the same period, 22 reported a higher share; pooled, the state comes to 44.3%.
Which counties border Sherman County?
Sherman County borders 5 counties: Howard County, Valley County, Buffalo County, Greeley County and Custer County.
Products
Sherman County, Products
Testing a home in Sherman County
In Sherman County, 59.8% of 396 tests reported to CDC in 2019 reached 4 pCi/L, against 44.3% pooled across Nebraska. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Sherman 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
MonitorAEGTEST
HOUND-3786 rechargeable radon monitor with a 3.5-inch color screen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Sherman County, Bordering counties
Counties bordering Sherman County
Calculated by Radon411- Radon levels in Greeley CountyEPA zone 1
61.5%at or above 4 pCi/L
Median 4.5 pCi/L · 39 tests · 1.7 points above Sherman County
- Radon levels in Howard CountyEPA zone 2
52.8%at or above 4 pCi/L
Median 4.1 pCi/L · 108 tests · 7.0 points below Sherman County
- Radon levels in Custer CountyEPA zone 2
47.4%at or above 4 pCi/L
Median 3.9 pCi/L · 114 tests · 12.4 points below Sherman County
- Radon levels in Valley CountyEPA zone 2
45.5%at or above 4 pCi/L
Median 3.4 pCi/L · 66 tests · 14.3 points below Sherman County
- Radon levels in Buffalo CountyEPA zone 2
43.8%at or above 4 pCi/L
Median 3.5 pCi/L · 1,467 tests · 16.0 points below Sherman County
Sherman County, Cities and towns
Cities and towns in Sherman County
About 2,924 people live in Sherman County by the Census Bureau's estimate for July 1, 2025, 36 fewer than in 2020 (−1.2%). Spread over its land, that is 5.2 people to the square mile. Its largest town, Loup City, has 1,026 residents, 35.1% of the total. Together its 5 incorporated places hold 54.2% of those residents; the other 45.8% live outside any of them. Testing is reported here more often than across the state: CDC's 396 reported tests for 2019 come to 135 for every 1,000 residents (2025 estimate), against 25.7 for Nebraska.
From Loup City to Hazard, CDC publishes no figure by town: each reads Sherman County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Loup City | 1,026 | −2.2% | 35.1% |
| Litchfield | 213 | −1.4% | 7.3% |
| Ashton | 200 | −2.0% | 6.8% |
| Rockville | 88 | −1.1% | 3.0% |
| Hazard | 59 | −1.7% | 2.0% |
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).
Sherman County, Homes
Homes in Sherman County
Sherman County is a place of houses on their own lots: 77% of its 1,797 homes are detached single-family houses, against 72% across Nebraska. The homes are older than Nebraska's as a whole: half were built before 1962 (1975 for Nebraska), and 49% date from before 1960. Owners live in 76% of the occupied homes (Nebraska: 67%), so for most households a test and a fix are their own to order.
| Homes | Sherman County | Nebraska |
|---|---|---|
| Housing units | 1,797 | 855,631 |
| Detached houses | 77% | 72% |
| In buildings of 5 or more | 3% | 17% |
| Mobile homes | 17% | 3% |
| Built before 1960 | 49% | 32% |
| Built since 2000 | 14% | 22% |
| Middle year built | 1962 | 1975 |
| Owner-occupied | 76% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.