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Radon Levels in Nance County, Nebraska

EPA puts Nance County in Zone 1, its highest radon zone, and only 6 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    56.9%

    9.2 pts above NE

    Nance
    56.9%
    Nebraska
    47.7%

    432 tests, 2017

  • Median result

    4.5pCi/L

    Action level reached

    Nance
    4.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2017

  • Tests reported

    432

    24th of 74 by tests

    Nance
    432
    Douglas
    18,306

    Reported to CDC before any fix, 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Nebraska

    37 of 74

    Middle half

    Nance
    56.9%
    Webster
    84.6%

    By share, of 74 with 30+ tests

Read a result for Nance County

Starts at Nance County's median, 4.5 pCi/L

4.5pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 4.5 pCi/L

At or above 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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. Nance County's median reported result, 2017.

Interpret this readingWhat a fix costs

The data

Nance County, At a glance

Nance County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Nance County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 65% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Nance County, 2023

Share of reported tests at or above 4 pCi/L, by year, Nance County
Share of reported tests at or above 4 pCi/L, by year, Nance County
YearShare of reported tests at or above 4 pCi/L
201465.0%
201558.3%
201656.4%
201756.9%
201850.0%
201950.0%
202050.0%
202152.9%
202275.0%
2023100.0%

2023: 100.0%. Across these years the share ran from 50.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 6 tests were reported to CDC for Nance 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).

How to read these figures

Nance County, Compared

Nance County radon figures, compared

Calculated by Radon411

More than half: 56.9% of the 432 radon tests reported to CDC for Nance County in 2017 read at least 4 pCi/L. That places it 37th of 74 Nebraska counties with 30 or more tests for the same period. That is 9.2 points above the 47.7% pooled from 92 Nebraska counties.

The newest figure, in 2023, counts only 6 tests (100.0% at or above 4 pCi/L), too few to compare, so this reading uses the 432-test figure.

The median result, 4.5 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 24.1 pCi/L. The rest split 19.4% under 2 pCi/L and 23.6% from 2 to 4 (Nebraska: 25.6% and 26.7%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 56.9% share point the same way here.

3 of its 5 bordering counties with figures ran higher, led by Boone County at 65.4%; Merrick County reported 27.5%. Statewide for the same period, Webster County reported the highest share (84.6%) and Cherry County the lowest (15.4%).

The busiest year on file was 2017, with 432 tests reported; the quietest, 2022, had 4.

Over 7 years of annual figures the share fell 12.1 points, from 65.0% in 2014 to 52.9% in 2021; its peak was 65.0% in 2014. Nationally, every county with a figure for the same period pools to 31.7%; Nance County sits 25.2 points above it. CDC also counts 36 tests taken after mitigation in Nance County for the same period: tests in homes where a fix was already in.

Share of reported tests at or above 4 pCi/L by year, Nance County against Nebraska2014 to 2021, years with 30 or more tests: Nance County 65.0% to 52.9%, the state's pooled share 34.9% in 2021.
Nance CountyNebraska, pooled
Share of reported tests at or above 4 pCi/L by year, Nance County against Nebraska: data table
YearTestsNance County, at or above 4 pCi/LNebraska, pooled
20146065.0%50.5%
201510858.3%53.3%
201611756.4%47.4%
201743256.9%47.7%
20189050.0%44.5%
20193650.0%44.3%
20215152.9%34.9%
Nance County against Nebraska, the United States and nearby counties, 2017
AreaTestsAt or above 4 pCi/LMedianDifference from Nance County
Nance County43256.9%4.5 pCi/LThis county
Nebraska, pooled92 counties, pooled65,66747.7%Not pooled−9.2 points
United States, pooled937 counties, pooled528,06231.7%Not pooled−25.2 points
Webster Countyhighest in the state7884.6%6.0 pCi/L+27.7 points
Cherry Countylowest in the state3915.4%1.5 pCi/L−41.5 points
Boone County, NEborders it32165.4%6.1 pCi/L+8.5 points
Howard County, NEborders it5461.1%4.5 pCi/L+4.2 points
Greeley County, NEborders it4257.1%5.0 pCi/L+0.2 points
Platte County, NEborders it1,10453.3%4.3 pCi/L−3.6 points
Merrick County, NEborders it12027.5%2.3 pCi/L−29.4 points
Where Nance County's reported results fell, 2017, beside Nebraska and the United States
ResultNance County testsNance County shareNebraska shareU.S. shareAgainst Nebraska
Under 2 pCi/L8419.4%25.6%43.5%−6.2 points
2 to 4 pCi/L10223.6%26.7%24.8%−3.1 points
4 pCi/L and above24656.9%47.7%31.7%+9.2 points
Nance County ranked among the 74 Nebraska counties with 30 or more tests, by share at or above 4 pCi/L, 2017
CountyRankTestsAt or above 4 pCi/LMedian
Pierce County32 of 7420457.4%5.8 pCi/L
Gage County33 of 7480157.3%5.0 pCi/L
Greeley County34 of 744257.1%5.0 pCi/L
Morrill County34 of 744257.1%4.3 pCi/L
Dakota County36 of 7449557.0%4.9 pCi/L
Nance County37 of 7443256.9%4.5 pCi/L
Adams County38 of 7491256.9%4.2 pCi/L
Nuckolls County39 of 749056.7%4.8 pCi/L
Phelps County40 of 7444456.1%4.3 pCi/L
Madison County41 of 741,29054.7%4.5 pCi/L
Colfax County42 of 7424354.3%4.9 pCi/L
Nance County radon tests by year, against Nebraska's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNebraska, pooledChange from the row before
20236100.0%12.3 pCi/L20.1 pCi/L38.2%+25.0 points
2022475.0%8.3 pCi/L15.7 pCi/L34.0%+22.1 points
20215152.9%5.1 pCi/L16.1 pCi/L34.9%+2.9 points
20202450.0%4.2 pCi/L22.2 pCi/L42.2%Level
20193650.0%4.5 pCi/L18.3 pCi/L44.3%Level
20189050.0%3.8 pCi/L11.7 pCi/L44.5%−6.9 points
201743256.9%4.5 pCi/L24.1 pCi/L47.7%+0.5 points
201611756.4%4.6 pCi/L17.5 pCi/L47.4%−1.9 points
201510858.3%4.0 pCi/L12.9 pCi/L53.3%−6.7 points
20146065.0%6.3 pCi/L39.5 pCi/L50.5%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Nance County, Geology

The ground under Nance County

Predicted

USGS's geologic map splits Nance County: 64.5% of its land is high radon potential and 35.5% moderate. The map puts 64.5% of Nance County in the area it calls Pre-Wisconsin glacial deposits and 35.5% in Loess over Tertiary sediments. USGS gives the first a radon index of 13, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Nance County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Pre-Wisconsin glacial depositsLoess-mantled glacial drift.High1364.5%
Loess over Tertiary sedimentsTertiary bedrock covered by varying thicknesses of loess.Moderate1135.5%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Nance County beside the ground around it

Nance County has more high-potential ground than Nebraska as a whole: 64.5% of its land against 40.9%. Of the 5 counties that border it, 3 have more high-potential ground, Boone County the most at 92.7%.

Share of land by USGS radon potential: Nance County, the 5 counties bordering it and Nebraska
AreaEPA zoneLow potentialModerate potentialHigh potential
Nance CountyZone 1None35.5%64.5%
Boone CountyZone 17.3%None92.7%
Merrick CountyZone 2None99.2%0.8%
Platte CountyZone 1None17.4%82.6%
Greeley CountyZone 113.5%5.2%81.3%
Howard CountyZone 2None83.4%16.6%
Nebraska93 counties, pooled by land areaVaries28.2%30.9%40.9%

The map rates the ground, not the air in any home.

Local help

Nance County, Local resources

Radon testing and mitigation in Nance County

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

Nance County, Questions

Questions about radon in Nance County

Are radon levels high in Nance County?

In 2023, 100.0% of the radon tests reported to CDC for Nance County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 12.3 pCi/L. Of 74 Nebraska counties with 30 or more tests for the same period, 36 reported a higher share; pooled, the state comes to 47.7%.

Which counties border Nance County?

Nance County borders 5 counties: Boone County, Merrick County, Platte County, Greeley County and Howard County.

Products

Nance County, Products

Testing a home in Nance County

In Nance County, 56.9% of 432 tests reported to CDC in 2017 reached 4 pCi/L, against 47.7% pooled across Nebraska. In Zone 1 the year-round level in Nance 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

Nance County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Nance County

Explore

Nance County, Bordering counties

Counties bordering Nance County

Calculated by Radon411

Nance County, Cities and towns

Cities and towns in Nance County

About 3,290 people live in Nance County by the Census Bureau's estimate for July 1, 2025, 102 fewer than in 2020 (−3.0%). Spread over its land, that is 7.5 people to the square mile. Its largest town, Fullerton, has 1,228 residents, 37.3% of the total. Together its 3 incorporated places hold 67.0% of those residents; the other 33.0% live outside any of them. Testing is reported here more often than across the state: CDC's 432 reported tests for 2017 come to 131 for every 1,000 residents (2025 estimate), against 32.5 for Nebraska.

From Fullerton to Belgrade, CDC publishes no figure by town: each reads Nance County's.

The cities and towns in Nance County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Fullerton1,228−2.2%37.3%
Genoa868−3.6%26.4%
Belgrade108−3.6%3.3%

3 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).

Nance County, Homes

Homes in Nance County

Nance County is a place of houses on their own lots: 94% of its 1,622 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 61% date from before 1960. Owners live in 79% of the occupied homes (Nebraska: 67%), so for most households a test and a fix are their own to order.

Homes in Nance County, Nebraska, 2019 to 2023
HomesNance CountyNebraska
Housing units1,622855,631
Detached houses94%72%
In buildings of 5 or more2%17%
Mobile homes1%3%
Built before 196061%32%
Built since 200011%22%
Middle year built19501975
Owner-occupied79%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.