Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Grant County, Nebraska
EPA puts Grant County in Zone 3, its lowest radon zone, and only 12 radon tests from it are on file with CDC (2018). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
37.5%
Garden County
- Garden
- 37.5%
- Cherry
- 13.3%
3 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
37.5%
Garden County, 37 miles
- Garden
- 37.5%
- Nebraska
- 58.5%
Share at 4+ pCi/L, 56 tests, 2008 to 2017
Ground above low
None
71.8 pts below Nebraska
- Grant
- 0.0%
- Nebraska
- 71.8%
Share of land USGS rates moderate or high potential
Tests reported
12
Too few for a share
- Grant
- 12
- Needed
- 30
2018
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Grant 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
Grant County, At a glance
Grant County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Grant County, 2018
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
2018: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 12 tests were reported to CDC for Grant County over 2018, 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: 2018. Measured data period: 2005 to 2018 (every CDC figure on file).
Grant County, Compared
Grant County radon figures, compared
Calculated by Radon411CDC's largest figure for Grant County rests on 12 tests in 2018, 0 of them at or above 4 pCi/L, so each test moves its share by 8.3 points and no rank or comparison is drawn from it. Results reached as high as 1.5 pCi/L, with a middle value of 1.4 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Garden County reported the largest share at or above 4 pCi/L, 37.5%, and Cherry County the smallest, 13.3%, with Sheridan County at 34.6% between. Farther out, Keith County (50 miles away) at 55.0%, Deuel County (63 miles away) at 42.9% and Morrill County (67 miles away) at 42.9% 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 Grant County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Grant County, Geology
The ground under Grant County
PredictedUSGS's geologic map puts all of Grant County's mapped land in one class: low radon potential. All of it lies in the area the map calls Sand Hills, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Sand Hills | Quaternary windblown sand. | Low | 8 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Grant County beside the ground around it
Across Nebraska 40.9% of the land is rated high; none of Grant County's is. Of the 5 counties that border it, 1 has more high-potential ground, Sheridan County the most at 0.3%.
The map rates the ground, not the air in any home.
Local help
Grant County, Local resources
Radon testing and mitigation in Grant 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
Grant County, Questions
Questions about radon in Grant County
Are radon levels high in Grant County?
In 2018, 0.0% of the radon tests reported to CDC for Grant County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.4 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Garden County reported the largest share at or above 4 pCi/L, 37.5%, and Cherry County the smallest, 13.3%, with Sheridan County at 34.6% between.
Which counties border Grant County?
Grant County borders 5 counties: Arthur County, Hooker County, Garden County, Cherry County and Sheridan County.
Products
Grant County, Products
Testing a home in Grant County
No CDC figure names Grant County; the nearest county with one, Garden County (37 miles away), reported 37.5% 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. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Grant County.
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-1085 palm-sized rechargeable radon detector
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Semiconductor sensor
First reading: Within 6 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Grant County, Bordering counties
Counties bordering Grant County
Calculated by Radon411- Radon levels in Garden CountyEPA zone 3
37.5%at or above 4 pCi/L
Median 3.5 pCi/L · 56 tests
- Radon levels in Sheridan CountyEPA zone 2
34.6%at or above 4 pCi/L
Median 2.9 pCi/L · 107 tests
- Radon levels in Cherry CountyEPA zone 3
13.3%at or above 4 pCi/L
Median 1.7 pCi/L · 30 tests
- Radon levels in Arthur CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 1.5 pCi/L · 9 tests
- Radon levels in Hooker CountyEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 3 tests
Grant County, Cities and towns
Cities and towns in Grant County
Grant County has been losing residents: from 612 in 2020 to 561 on July 1, 2025, a fall of 8.3% by the Census Bureau's estimates. Spread over its land, that is 0.7 people to the square mile. Hyannis, its one incorporated place, has 148 residents, 26.4% of the total. CDC's 12 reported tests for 2018 work out to 21.4 per 1,000 residents (2025 estimate), close to Nebraska's 31.1.
Hyannis is the one incorporated place here; CDC publishes no figure by town, so it reads Grant County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Hyannis | 148 | −8.6% | 26.4% |
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).
Grant County, Homes
Homes in Grant County
Grant County is a place of houses on their own lots: 89% of its 418 homes are detached single-family houses, against 72% across Nebraska. The homes are older than Nebraska's as a whole: half were built before 1961 (1975 for Nebraska), and 49% date from before 1960. 68% 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 | Grant County | Nebraska |
|---|---|---|
| Housing units | 418 | 855,631 |
| Detached houses | 89% | 72% |
| In buildings of 5 or more | 1% | 17% |
| Mobile homes | 7% | 3% |
| Built before 1960 | 49% | 32% |
| Built since 2000 | 15% | 22% |
| Middle year built | 1961 | 1975 |
| Owner-occupied | 68% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.