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Radon Levels in Sheridan County, Nebraska

EPA puts Sheridan County in Zone 2, its middle 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

    38.5%

    21.2 pts below NE

    Sheridan
    38.5%
    Nebraska
    59.7%

    109 tests, 2006 to 2015

  • Median result

    2.9pCi/L

    Below action level

    Sheridan
    2.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2006 to 2015

  • Tests reported

    109

    52nd of 76 by tests

    Sheridan
    109
    Douglas
    8,457

    Reported to CDC before any fix, 2006 to 2015

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    EPA predicts 2 to 4 pCi/L indoors

  • Rank in Nebraska

    69 of 76

    Lowest quarter

    Sheridan
    38.5%
    Clay
    85.5%

    By share, of 76 with 30+ tests

Read a result for Sheridan County

Starts at Sheridan County's median, 2.9 pCi/L

2.9pCi/L

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

EPA’s reading of 2.9 pCi/L

Between 2 and 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Sheridan County's median reported result, 2006 to 2015.

Interpret this readingWhat a fix costs

The data

Sheridan County, At a glance

Sheridan County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Sheridan County is a county: EPA's forecast for it as a whole is an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³). It describes no single address, and homes above EPA's are found in every zone, this one included.

USGS geologic potential: Low across 68% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Sheridan County, 2023

Share of reported tests at or above 4 pCi/L, by year, Sheridan County
Share of reported tests at or above 4 pCi/L, by year, Sheridan County
YearShare of reported tests at or above 4 pCi/L
201475.0%
201528.0%
201620.0%
201747.8%
201850.0%
201921.4%
202040.0%
202125.0%
20220.0%
20230.0%

2023: 0.0%. Across these years the share ran from 0.0% to 75.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 6 tests were reported to CDC for Sheridan 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

Sheridan County, Compared

Sheridan County radon figures, compared

Calculated by Radon411

In Sheridan County, about 4 in 10 reported tests over the 2006 to 2015 laboratory totals (42 of 109) were at or above EPA's action level. Against the national pool of 36.3%, the gap is 2.2 points higher. Across 93 Nebraska counties pooled together, 59.7% of tests reached that level, so Sheridan County runs 21.2 points below its state.

The newest figure, in 2023, counts only 6 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 109-test figure.

Of 4 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 3 a smaller one; the spread is 34.0% (Garden County) to 56.9% (Dawes County). By share, Sheridan County is 69th of 76 Nebraska counties with 30 or more tests for the same period.

Year by year, 2014 opened at 75.0% and 2020 closed at 40.0% (down 35.0 points), with 2014 the high at 75.0%. Half the tests came in under 2.9 pCi/L and half over it; the single highest reached 13.5 pCi/L. Below the action level, 34 tests (31.2%) came in under 2 pCi/L, against 17.9% statewide, and 33 tests (30.3%) fell between 2 and 4, against 22.4% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 38.5% share point the same way here. USGS geology rates 68% of the county's land low radon potential.

The busiest year on file was 2015, with 75 tests reported; the quietest, 2023, had 6.

Share of reported tests at or above 4 pCi/L by year, Sheridan County against Nebraska2014 to 2020, years with 30 or more tests: Sheridan County 75.0% to 40.0%, the state's pooled share 42.2% in 2020.
Sheridan CountyNebraska, pooled
Share of reported tests at or above 4 pCi/L by year, Sheridan County against Nebraska: data table
YearTestsSheridan County, at or above 4 pCi/LNebraska, pooled
20147275.0%50.5%
20157528.0%53.3%
20164520.0%47.4%
20176947.8%47.7%
20184250.0%44.5%
20194221.4%44.3%
20203040.0%42.2%
Sheridan County against Nebraska, the United States and nearby counties, 2006 to 2015, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Sheridan County
Sheridan County10938.5%2.9 pCi/LThis county
Nebraska, pooled93 counties, pooled38,15859.7%Not pooled+21.2 points
United States, pooled2,669 counties, pooled1,805,52836.3%Not pooled−2.2 points
Clay Countyhighest in the state15985.5%8.6 pCi/L+47.0 points
Merrick Countylowest in the state13526.7%2.3 pCi/L−11.8 points
Dawes County, NEborders it54356.9%4.6 pCi/L+18.4 points
Morrill County, NEborders it5836.2%3.0 pCi/L−2.3 points
Box Butte County, NEborders it29834.9%3.1 pCi/L−3.6 points
Garden County, NEborders it5334.0%2.7 pCi/L−4.5 points
Bennett County, SDborders it333.3%3.0 pCi/L−5.2 points
Cherry County, NEborders it224.5%1.9 pCi/L−34.0 points
Grant County, NEborders it40.0%0.5 pCi/L−38.5 points
Where Sheridan County's reported results fell, 2006 to 2015, laboratory, beside Nebraska and the United States
ResultSheridan County testsSheridan County shareNebraska shareU.S. shareAgainst Nebraska
Under 2 pCi/L3431.2%17.9%39.4%+13.3 points
2 to 4 pCi/L3330.3%22.4%24.3%+7.9 points
4 pCi/L and above4238.5%59.7%36.3%−21.2 points
Sheridan County ranked among the 76 Nebraska counties with 30 or more tests, by share at or above 4 pCi/L, 2006 to 2015, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Holt County64 of 7630746.9%3.6 pCi/L
Brown County65 of 765543.6%3.8 pCi/L
Kimball County66 of 768343.4%3.5 pCi/L
Deuel County67 of 765141.2%3.5 pCi/L
Dawson County68 of 7618240.7%3.1 pCi/L
Sheridan County69 of 7610938.5%2.9 pCi/L
Hall County70 of 7699336.5%3.2 pCi/L
Morrill County71 of 765836.2%3.0 pCi/L
Box Butte County72 of 7629834.9%3.1 pCi/L
Garden County73 of 765334.0%2.7 pCi/L
Howard County74 of 7611433.3%2.8 pCi/L
Sheridan County radon tests by year, against Nebraska's pooled share
YearTestsAt or above 4 pCi/LMedianHighestNebraska, pooledChange from the row before
202360.0%1.8 pCi/L3.8 pCi/L38.2%Level
202290.0%0.3 pCi/L2.8 pCi/L34.0%−25.0 points
20211225.0%2.5 pCi/L4.8 pCi/L34.9%−15.0 points
20203040.0%3.7 pCi/L7.5 pCi/L42.2%+18.6 points
20194221.4%2.5 pCi/L7.1 pCi/L44.3%−28.6 points
20184250.0%3.9 pCi/L6.2 pCi/L44.5%+2.2 points
20176947.8%3.8 pCi/L11.9 pCi/L47.7%+27.8 points
20164520.0%2.3 pCi/L8.8 pCi/L47.4%−8.0 points
20157528.0%2.7 pCi/L11.3 pCi/L53.3%−47.0 points
20147275.0%5.0 pCi/L12.9 pCi/L50.5%First on file

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

Sheridan County, Geology

The ground under Sheridan County

Predicted

USGS's geologic map splits Sheridan County: 68.0% of its land is low radon potential and 0.3% high and 31.7% moderate. The map puts 67.9% of Sheridan County in the area it calls Sand Hills and 31.7% in Tertiary Rocks. 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).

USGS's geologic areas under Sheridan County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Sand HillsQuaternary windblown sand.Low867.9%
Tertiary RocksTertiary sandstone, siltstone, and volcanic ash.Moderate1131.7%

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

Sheridan County beside the ground around it

Nebraska as a whole has more high-potential ground than Sheridan County: 40.9% of its land, against 0.3% here. Of the 8 counties that border it, 1 has more high-potential ground, Dawes County the most at 34.0%.

Share of land by USGS radon potential: Sheridan County, the 8 counties bordering it and Nebraska
AreaEPA zoneLow potentialModerate potentialHigh potential
Sheridan CountyZone 268.0%31.7%0.3%
Dawes CountyZone 2None66.0%34.0%
Box Butte CountyZone 226.0%74.0%None
Oglala Lakota County, SDZone 21.9%98.1%None
Bennett County, SDZone 219.5%80.5%None
Grant CountyZone 3100%NoneNone
Cherry CountyZone 398.5%1.5%None
Morrill CountyZone 240.7%59.3%None
Garden CountyZone 375.0%25.0%None
Nebraska93 counties, pooled by land areaVaries28.2%30.9%40.9%

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

Local help

Sheridan County, Local resources

Radon testing and mitigation in Sheridan 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

Sheridan County, Questions

Questions about radon in Sheridan County

Are radon levels high in Sheridan County?

In 2023, 0.0% of the radon tests reported to CDC for Sheridan County, Nebraska were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 76 Nebraska counties with 30 or more tests for the same period, 68 reported a higher share; pooled, the state comes to 59.7%.

Which counties border Sheridan County?

Sheridan County borders 8 counties: Dawes County, NE, Box Butte County, NE, Oglala Lakota County, SD, Bennett County, SD, Grant County, NE, Cherry County, NE, Morrill County, NE and Garden County, NE.

Products

Sheridan County, Products

Testing a home in Sheridan County

In Sheridan County, 38.5% of 109 tests reported to CDC over the 2006 to 2015 laboratory totals reached 4 pCi/L, against 59.7% pooled across Nebraska. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Sheridan County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Sheridan County homes, compared

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Sheridan County, Bordering counties

Counties bordering Sheridan County

Calculated by Radon411

Sheridan County, Cities and towns

Cities and towns in Sheridan County

Sheridan County has been losing residents: from 5,102 in 2020 to 4,809 on July 1, 2025, a fall of 5.7% by the Census Bureau's estimates. Spread over its land, that is 2.0 people to the square mile. Its largest town, Gordon, has 1,417 residents, 29.5% of the total. Together its 4 incorporated places hold 57.7% of those residents; the other 42.3% live outside any of them. CDC's 109 reported tests for 2006 to 2015 work out to 22.7 per 1,000 residents (2025 estimate), close to Nebraska's 18.9.

From Gordon to Clinton, CDC publishes no figure by town: each reads Sheridan County's.

The cities and towns in Sheridan County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Gordon1,417−5.9%29.5%
Rushville767−6.2%15.9%
Hay Springs555−7.0%11.5%
Clinton38−7.3%0.8%

4 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).

Sheridan County, Homes

Homes in Sheridan County

Sheridan County is a place of houses on their own lots: 86% of its 2,704 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 63% date from before 1960. 70% 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 in Sheridan County, Nebraska, 2019 to 2023
HomesSheridan CountyNebraska
Housing units2,704855,631
Detached houses86%72%
In buildings of 5 or more3%17%
Mobile homes8%3%
Built before 196063%32%
Built since 20005%22%
Middle year built19501975
Owner-occupied70%67%

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