Short-term kit
Air Chek Short-Term radon test kit you hang, lab fee included
- Lab fee included
In home: 72 to 168 hours
Locations and reports
Radon Levels in Rock County, Nebraska
EPA puts Rock County in Zone 3, its lowest radon zone, and only 1 radon test from it is 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
59.6%
Boyd County
- Boyd
- 59.6%
- Brown
- 41.9%
3 of 5 neighbours have 30+ tests, 2008 to 2017
Nearest county
41.9%
Brown County, 25 miles
- Brown
- 41.9%
- Nebraska
- 58.5%
Share at 4+ pCi/L, 62 tests, 2008 to 2017
Ground above low
22.6%
49.2 pts below Nebraska
- Rock
- 22.6%
- Nebraska
- 71.8%
Share of land USGS rates moderate or high potential
Tests reported
24
Too few for a share
- Rock
- 24
- Needed
- 30
2008 to 2017, laboratory
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 Rock 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
Rock County, At a glance
Rock County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 77% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Rock County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 33.3% |
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2023 | 0.0% |
2023: 0.0%. Across these years the share ran from 0.0% to 33.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 1 test was reported to CDC for Rock 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).
Rock County, Compared
Rock County radon figures, compared
Calculated by Radon411CDC's largest figure for Rock County rests on 24 tests over the 2008 to 2017 laboratory totals, 1 of them at or above 4 pCi/L, so each test moves its share by 4.2 points and no rank or comparison is drawn from it. Results reached as high as 6.0 pCi/L, with a middle value of 1.2 pCi/L.
Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Boyd County reported the largest share at or above 4 pCi/L, 59.6%, and Brown County the smallest, 41.9%, with Holt County at 42.7% between. Farther out, Valley County (64 miles away) at 52.4%, Custer County (72 miles away) at 52.3% and Antelope County (73 miles away) at 71.3% 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 Rock County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 77% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Rock County, Geology
The ground under Rock County
PredictedMost of the ground under Rock County is one class on USGS's geologic map: 77.4% of its land is low radon potential, with 22.6% moderate. The map puts 77.4% of Rock County in the area it calls Sand Hills and 22.6% in Pierre Shale. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 11, in the moderate band (9 to 11).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Sand Hills | Quaternary windblown sand. | Low | 8 | 77.4% |
| Pierre Shale | Cretaceous marine shale | Moderate | 11 | 22.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Rock County beside the ground around it
Across Nebraska 40.9% of the land is rated high; none of Rock County's is. Of the 5 counties that border it, 3 have more high-potential ground, Boyd County the most at 95.1%.
The map rates the ground, not the air in any home.
Local help
Rock County, Local resources
Radon testing and mitigation in Rock 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
Rock County, Questions
Questions about radon in Rock County
Are radon levels high in Rock County?
In 2023, 0.0% of the radon tests reported to CDC for Rock County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.5 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Boyd County reported the largest share at or above 4 pCi/L, 59.6%, and Brown County the smallest, 41.9%, with Holt County at 42.7% between.
Which counties border Rock County?
Rock County borders 5 counties: Brown County, Keya Paha County, Holt County, Loup County and Boyd County.
Products
Rock County, Products
Testing a home in Rock County
No CDC figure names Rock County; the nearest county with one, Brown County (25 miles away), reported 41.9% 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 Rock County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
Monitor
RadonScan USB-powered radon monitor with a color screen
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Rock County, Bordering counties
Counties bordering Rock County
Calculated by Radon411- Radon levels in Boyd CountyEPA zone 1
59.6%at or above 4 pCi/L
Median 4.6 pCi/L · 47 tests
- Radon levels in Holt CountyEPA zone 3
42.7%at or above 4 pCi/L
Median 3.3 pCi/L · 349 tests
- Radon levels in Brown CountyEPA zone 3
41.9%at or above 4 pCi/L
Median 3.7 pCi/L · 62 tests
- Radon levels in Keya Paha CountyEPA zone 2
28.6%at or above 4 pCi/L
Median 2.8 pCi/L · 14 tests
- Radon levels in Loup CountyEPA zone 3
6.7%at or above 4 pCi/L
Median 1.1 pCi/L · 15 tests
Rock County, Cities and towns
Cities and towns in Rock County
About 1,259 people live in Rock County by the Census Bureau's estimate for July 1, 2025, 9 fewer than in 2020 (−0.7%). Spread over its land, that is 1.2 people to the square mile. Its largest town, Bassett, has 536 residents, 42.6% of the total. Together its 2 incorporated places hold 48.1% of those residents; the other 51.9% live outside any of them. CDC's 24 reported tests for 2008 to 2017 work out to 19.1 per 1,000 residents (2025 estimate), close to Nebraska's 21.2.
From Bassett to Newport, CDC publishes no figure by town: each reads Rock County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Bassett | 536 | −1.5% | 42.6% |
| Newport | 69 | −1.4% | 5.5% |
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).
Rock County, Homes
Homes in Rock County
Rock County is a place of houses on their own lots: 91% of its 829 homes are detached single-family houses, against 72% across Nebraska. The homes are older than Nebraska's as a whole: half were built before 1967 (1975 for Nebraska), and 42% 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 | Rock County | Nebraska |
|---|---|---|
| Housing units | 829 | 855,631 |
| Detached houses | 91% | 72% |
| In buildings of 5 or more | 1% | 17% |
| Mobile homes | 6% | 3% |
| Built before 1960 | 42% | 32% |
| Built since 2000 | 7% | 22% |
| Middle year built | 1967 | 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.