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 Webster County, Nebraska
EPA puts Webster County in Zone 1, its highest radon zone, and only 17 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
83.2%
24.7 pts above NE
- Webster
- 83.2%
- Nebraska
- 58.5%
137 tests, 2008 to 2017
Median result
7.7pCi/L
Action level reached
- Webster
- 7.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2008 to 2017
Tests reported
137
51st of 77 by tests
- Webster
- 137
- Douglas
- 8,556
Reported to CDC before any fix, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
EPA predicts over 4 pCi/L indoors
Rank in Nebraska
2 of 77
Top quarter
- Webster
- 83.2%
- Clay
- 85.1%
By share, of 77 with 30+ tests
Read a result for Webster County
Starts at Webster County's median, 7.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 7.7 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. Webster County's median reported result, 2008 to 2017.
The data
Webster County, At a glance
Webster County at a glance
Predicted: EPA radon zone
EPA Zone 1: highest predicted potential
EPA puts all of Webster 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 Webster County, 2023
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 73.9% |
| 2015 | 60.9% |
| 2016 | 73.5% |
| 2017 | 84.6% |
| 2018 | 74.1% |
| 2019 | 57.9% |
| 2020 | 42.4% |
| 2021 | 80.0% |
| 2022 | 27.3% |
| 2023 | 76.5% |
2023: 76.5%. Across these years the share ran from 27.3% to 84.6%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 17 tests were reported to CDC for Webster 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).
Webster County, Compared
Webster County radon figures, compared
Calculated by Radon411More than half: 83.2% of the 137 radon tests reported to CDC for Webster County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 2nd of 77 Nebraska counties with 30 or more tests for the same period. That is 24.7 points above the 58.5% pooled from 93 Nebraska counties.
The newest figure, in 2023, counts only 17 tests (76.5% at or above 4 pCi/L), too few to compare, so this reading uses the 137-test figure.
The median result, 7.7 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 41.9 pCi/L. The rest split 5.1% under 2 pCi/L and 11.7% from 2 to 4 (Nebraska: 18.6% and 22.8%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 83.2% share point the same way here.
1 of its 5 bordering counties with figures ran higher, led by Clay County at 85.1%; Kearney County reported 59.4%. Statewide for the same period, Clay County reported the highest share (85.1%) and Cherry County the lowest (13.3%).
The busiest year on file was 2016, with 102 tests reported; the quietest, 2021, had 15.
Over 7 years of annual figures the share fell 31.5 points, from 73.9% in 2014 to 42.4% in 2020; its peak was 84.6% in 2017. Nationally, every county with a figure for the same period pools to 35.7%; Webster County sits 47.5 points above it. CDC also counts 11 tests taken after mitigation in Webster County for the same period: tests in homes where a fix was already in.
Webster CountyNebraska, pooled
| Year | Tests | Webster County, at or above 4 pCi/L | Nebraska, pooled |
|---|---|---|---|
| 2014 | 69 | 73.9% | 50.5% |
| 2015 | 69 | 60.9% | 53.3% |
| 2016 | 102 | 73.5% | 47.4% |
| 2017 | 78 | 84.6% | 47.7% |
| 2018 | 81 | 74.1% | 44.5% |
| 2019 | 57 | 57.9% | 44.3% |
| 2020 | 99 | 42.4% | 42.2% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Webster County, Geology
The ground under Webster County
PredictedUSGS's geologic map puts all of Webster County's mapped land in one class: high radon potential. 97.6% of it lies in the area the map calls Pre-Wisconsin glacial deposits, to which USGS gives a radon index of 13, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Pre-Wisconsin glacial deposits | Loess-mantled glacial drift. | High | 13 | 97.6% |
| Loess over K-T | Loess-mantled Tertiary and Cretaceous bedrock. | High | 13 | 2.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Webster County beside the ground around it
Webster County has more high-potential ground than Nebraska as a whole: 100% of its land against 40.9%. Of the 7 counties that border it, none has as large a share of high-potential ground; Clay County comes nearest at 100%.
The map rates the ground, not the air in any home.
Local help
Webster County, Local resources
Radon testing and mitigation in Webster County
Listed radon businesses with an address in Webster 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.
Listed radon professionals by town: Blue Hill
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
Webster County, Questions
Questions about radon in Webster County
Are radon levels high in Webster County?
In 2023, 76.5% of the radon tests reported to CDC for Webster County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 7.8 pCi/L. Of 77 Nebraska counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 58.5%.
Which counties border Webster County?
Webster County borders 7 counties: Adams County, NE, Franklin County, NE, Nuckolls County, NE, Jewell County, KS, Smith County, KS, Kearney County, NE and Clay County, NE.
Products
Webster County, Products
Testing a home in Webster County
In Webster County, 83.2% of 137 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 58.5% pooled across Nebraska. In Zone 1 the year-round level in Webster 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
MonitorX-Sense
XR0B-SR battery digital radon monitor with an alarm
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
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
Webster County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Webster County
Explore
Webster County, Bordering counties
Counties bordering Webster County
Calculated by Radon411- Radon levels in Clay County, NEEPA zone 1
85.1%at or above 4 pCi/L
Median 8.6 pCi/L · 194 tests · 1.9 points above Webster County
- Radon levels in Nuckolls County, NEEPA zone 1
78.7%at or above 4 pCi/L
Median 8.4 pCi/L · 244 tests · 4.5 points below Webster County
- Radon levels in Franklin County, NEEPA zone 1
72.2%at or above 4 pCi/L
Median 6.1 pCi/L · 97 tests · 11.0 points below Webster County
- Radon levels in Adams County, NEEPA zone 1
69.3%at or above 4 pCi/L
Median 5.7 pCi/L · 1,308 tests · 13.9 points below Webster County
- Radon levels in Kearney County, NEEPA zone 1
59.4%at or above 4 pCi/L
Median 4.7 pCi/L · 138 tests · 23.8 points below Webster County
- Radon levels in Jewell County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
- Radon levels in Smith County, KSEPA zone 1
No CDC figure for 2008 to 2017; its page reads it against its own neighbours.
Webster County, Cities and towns
Cities and towns in Webster County
About 3,336 people live in Webster County by the Census Bureau's estimate for July 1, 2025, 53 fewer than in 2020 (−1.6%). Spread over its land, that is 5.8 people to the square mile. Its largest town, Red Cloud, has 946 residents, 28.4% of the total. Together its 5 incorporated places hold 64.6% of those residents; the other 35.4% live outside any of them. Testing is reported here more often than across the state: CDC's 137 reported tests for 2008 to 2017 come to 41.1 for every 1,000 residents (2025 estimate), against 21.2 for Nebraska.
From Red Cloud to Cowles, CDC publishes no figure by town: each reads Webster County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Red Cloud | 946 | −2.1% | 28.4% |
| Blue Hill | 789 | −1.5% | 23.7% |
| Bladen | 201 | −2.0% | 6.0% |
| Guide Rock | 199 | −1.5% | 6.0% |
| Cowles | 21 | Level | 0.6% |
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).
Webster County, Homes
Homes in Webster County
Webster County is a place of houses on their own lots: 90% of its 1,767 homes are detached single-family houses, against 72% across Nebraska. The homes are older than Nebraska's as a whole: half were built before 1950 (1975 for Nebraska), and 59% date from before 1960. Owners live in 81% of the occupied homes (Nebraska: 67%), so for most households a test and a fix are their own to order.
| Homes | Webster County | Nebraska |
|---|---|---|
| Housing units | 1,767 | 855,631 |
| Detached houses | 90% | 72% |
| In buildings of 5 or more | 1% | 17% |
| Mobile homes | 2% | 3% |
| Built before 1960 | 59% | 32% |
| Built since 2000 | 8% | 22% |
| Middle year built | 1950 | 1975 |
| Owner-occupied | 81% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.