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 Sioux County, Nebraska
EPA puts Sioux County in Zone 2, its middle radon zone, and only 4 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
Highest bordering
59.3%
Dawes County
- Dawes
- 59.3%
- Box Butte
- 36.2%
4 of 6 neighbours have 30+ tests, 2008 to 2017
Nearest county
59.3%
Dawes County, 36 miles
- Dawes
- 59.3%
- Nebraska
- 58.5%
Share at 4+ pCi/L, 516 tests, 2008 to 2017
Ground above low
100.0%
28.2 pts above Nebraska
- Sioux
- 100.0%
- Nebraska
- 71.8%
Share of land USGS rates moderate or high potential
Tests reported
26
Too few for a share
- Sioux
- 26
- Needed
- 30
2005 to 2014, laboratory
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 Sioux 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
Sioux County, At a glance
Sioux County at a glance
Predicted: EPA radon zone
EPA Zone 2: moderate predicted potential
Sioux County is a
USGS geologic potential: Moderate across 88% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Sioux County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 50.0% |
| 2015 | 0.0% |
| 2016 | 100.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2020 | 100.0% |
| 2021 | 40.0% |
| 2022 | 0.0% |
| 2023 | 25.0% |
2023: 25.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 4 tests were reported to CDC for Sioux 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).
Sioux County, Compared
Sioux County radon figures, compared
Calculated by Radon411CDC's largest figure for Sioux County rests on 26 tests over the 2005 to 2014 laboratory totals, 8 of them at or above 4 pCi/L, so each test moves its share by 3.8 points and no rank or comparison is drawn from it. Results reached as high as 14.6 pCi/L, with a middle value of 2.0 pCi/L.
Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Dawes County reported the largest share at or above 4 pCi/L, 59.3%, and Box Butte County the smallest, 36.2%, with Scotts Bluff County at 57.2% and Goshen County, WY at 41.7% between. Farther out, Morrill County (66 miles away) at 42.9%, Sheridan County (69 miles away) at 34.6% and Kimball County (89 miles away) at 44.4% have figures too. Pooled across 93 Nebraska counties, 58.5% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Clay County reported the highest share (85.1%) and Cherry County the lowest (13.3%). EPA's 1993 map puts Sioux County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 88% of the county's land moderate radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Sioux County, Geology
The ground under Sioux County
PredictedMost of the ground under Sioux County is one class on USGS's geologic map: 88.0% of its land is moderate radon potential, with 12.0% high. The map puts 88.0% of Sioux County in the area it calls Tertiary Rocks and 12.0% in Sharon Springs. USGS gives the first a radon index of 11, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Tertiary Rocks | Tertiary sandstone, siltstone, and volcanic ash. | Moderate | 11 | 88.0% |
| Sharon Springs | Cretaceous Pierre Shale bedrock, including the uranium-bearing Sharon Springs Member. | High | 12 | 12.0% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Sioux County beside the ground around it
Nebraska as a whole has more high-potential ground than Sioux County: 40.9% of its land, against 12.0% here. Of the 6 counties that border it, 3 have more high-potential ground, Fall River County, SD the most at 36.6%.
The map rates the ground, not the air in any home.
Local help
Sioux County, Local resources
Radon testing and mitigation in Sioux 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
Sioux County, Questions
Questions about radon in Sioux County
Are radon levels high in Sioux County?
In 2023, 25.0% of the radon tests reported to CDC for Sioux County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.1 pCi/L. Of the counties bordering it, 4 have a figure over the 2008 to 2017 laboratory totals: Dawes County reported the largest share at or above 4 pCi/L, 59.3%, and Box Butte County the smallest, 36.2%, with Scotts Bluff County at 57.2% and Goshen County, WY at 41.7% between.
Which counties border Sioux County?
Sioux County borders 6 counties: Dawes County, NE, Goshen County, WY, Box Butte County, NE, Fall River County, SD, Scotts Bluff County, NE and Niobrara County, WY.
Products
Sioux County, Products
Testing a home in Sioux County
No CDC figure names Sioux County; the nearest county with one, Dawes County (36 miles away), reported 59.3% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, 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 Sioux 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
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
Sioux County, Bordering counties
Counties bordering Sioux County
Calculated by Radon411- Radon levels in Fall River County, SDEPA zone 2
62.5%at or above 4 pCi/L
Median 5.8 pCi/L · 24 tests
- Radon levels in Dawes County, NEEPA zone 2
59.3%at or above 4 pCi/L
Median 5.0 pCi/L · 516 tests
- Radon levels in Scotts Bluff County, NEEPA zone 2
57.2%at or above 4 pCi/L
Median 4.3 pCi/L · 540 tests
- Radon levels in Goshen County, WYEPA zone 1
41.7%at or above 4 pCi/L
Median 3.3 pCi/L · 168 tests
- Radon levels in Box Butte County, NEEPA zone 2
36.2%at or above 4 pCi/L
Median 3.2 pCi/L · 287 tests
- Radon levels in Niobrara County, WYEPA zone 1
25.0%at or above 4 pCi/L
Median 3.5 pCi/L · 12 tests
Sioux County, Cities and towns
Cities and towns in Sioux County
The Census Bureau estimates 1,188 residents in Sioux County for July 1, 2025, 42 more than in 2020 (+3.7%). Spread over its land, that is 0.6 people to the square mile. Harrison, its one incorporated place, has 247 residents, 20.8% of the total. CDC's 26 reported tests for 2005 to 2014 work out to 21.9 per 1,000 residents (2025 estimate), close to Nebraska's 16.5.
Harrison is the one incorporated place here; CDC publishes no figure by town, so it reads Sioux County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Harrison | 247 | +3.3% | 20.8% |
One incorporated place, 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).
Sioux County, Homes
Homes in Sioux County
Sioux County is a place of houses on their own lots: 83% of its 682 homes are detached single-family houses, against 72% across Nebraska. The homes are older than Nebraska's as a whole: half were built before 1953 (1975 for Nebraska), and 56% date from before 1960. 56% of occupied homes are lived in by their owner (Nebraska: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Sioux County | Nebraska |
|---|---|---|
| Housing units | 682 | 855,631 |
| Detached houses | 83% | 72% |
| In buildings of 5 or more | 2% | 17% |
| Mobile homes | 10% | 3% |
| Built before 1960 | 56% | 32% |
| Built since 2000 | 12% | 22% |
| Middle year built | 1953 | 1975 |
| Owner-occupied | 56% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.