Skip to content
RADON411

Locations and reports

Radon Levels in Sheridan County, Kansas

EPA puts Sheridan County in Zone 1, its highest radon zone, and only 10 radon tests from it are on file with CDC (2022). 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

    67.7%

    30.4 pts above KS

    Sheridan
    67.7%
    Kansas
    37.3%

    31 tests, 2017

  • Median result

    5.8pCi/L

    Action level reached

    Sheridan
    5.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2017

  • Tests reported

    31

    44th of 45 by tests

    Sheridan
    31
    Johnson
    9,462

    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 Kansas

    1 of 45

    Top quarter

    Sheridan
    67.7%
    Sheridan
    67.7%

    By share, of 45 with 30+ tests

Read a result for Sheridan County

Starts at Sheridan County's median, 5.8 pCi/L

5.8pCi/L

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

EPA’s reading of 5.8 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. Sheridan County's median reported result, 2017.

Interpret this readingWhat a fix costs

The data

Sheridan County, At a glance

Sheridan County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Sheridan 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Sheridan County, 2022

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
201662.5%
201767.7%
201862.5%
201971.4%
2020100.0%
2021100.0%
202260.0%

2022: 60.0%. Across these years the share ran from 60.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 10 tests were reported to CDC for Sheridan County over 2022, 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: 2022. Measured data period: 2016 to 2022 (every CDC figure on file).

How to read these figures

Sheridan County, Compared

Sheridan County radon figures, compared

Calculated by Radon411

More than half: 67.7% of the 31 radon tests reported to CDC for Sheridan County in 2017 read at least 4 pCi/L. That places it 1st of 45 Kansas counties with 30 or more tests for the same period. That is 30.4 points above the 37.3% pooled from 97 Kansas counties.

The newest figure, in 2022, counts only 10 tests (60.0% at or above 4 pCi/L), too few to compare, so this reading uses the 31-test figure.

The median result, 5.8 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 26.7 pCi/L. The rest split 9.7% under 2 pCi/L and 22.6% from 2 to 4 (Kansas: 39.5% and 23.2%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 67.7% share point the same way here.

Thomas County, the one bordering county with a figure for the same period, reported 54.7%. Statewide for the same period, Logan County reported the highest share (65.9%) and Reno County the lowest (21.6%).

The busiest year on file was 2017, with 31 tests reported; the quietest, 2020, had 7.

Nationally, every county with a figure for the same period pools to 31.7%; Sheridan County sits 36.0 points above it.

Sheridan County against Kansas, the United States and nearby counties, 2017
AreaTestsAt or above 4 pCi/LMedianDifference from Sheridan County
Sheridan County3167.7%5.8 pCi/LThis county
Kansas, pooled97 counties, pooled23,90237.3%Not pooled−30.4 points
United States, pooled937 counties, pooled528,06231.7%Not pooled−36.0 points
Logan Countyhighest in the state4165.9%4.7 pCi/L−1.8 points
Reno Countylowest in the state29621.6%2.2 pCi/L−46.1 points
Norton County, KSborders it1776.5%5.5 pCi/L+8.8 points
Gove County, KSborders it1963.2%7.0 pCi/L−4.5 points
Graham County, KSborders it862.5%8.9 pCi/L−5.2 points
Decatur County, KSborders it1258.3%4.4 pCi/L−9.4 points
Thomas County, KSborders it6454.7%4.3 pCi/L−13.0 points
Where Sheridan County's reported results fell, 2017, beside Kansas and the United States
ResultSheridan County testsSheridan County shareKansas shareU.S. shareAgainst Kansas
Under 2 pCi/L39.7%39.5%43.5%−29.8 points
2 to 4 pCi/L722.6%23.2%24.8%−0.6 points
4 pCi/L and above2167.7%37.3%31.7%+30.4 points
Sheridan County ranked among the 45 Kansas counties with 30 or more tests, by share at or above 4 pCi/L, 2017
CountyRankTestsAt or above 4 pCi/LMedian
Sheridan County1 of 453167.7%5.8 pCi/L
Logan County2 of 454165.9%4.7 pCi/L
Smith County3 of 454663.0%5.5 pCi/L
Mitchell County4 of 456060.0%5.6 pCi/L
Jewell County5 of 454959.2%6.6 pCi/L
Nemaha County6 of 454158.5%4.9 pCi/L
Cloud County7 of 459057.8%5.3 pCi/L
Sherman County8 of 457655.3%4.2 pCi/L
Thomas County9 of 456454.7%4.3 pCi/L
Ellsworth County10 of 455954.2%4.6 pCi/L
Clay County11 of 4510253.9%4.7 pCi/L
Sheridan County radon tests by year, against Kansas' pooled share
YearTestsAt or above 4 pCi/LMedianHighestKansas, pooledChange from the row before
20221060.0%6.0 pCi/L9.0 pCi/L32.0%−40.0 points
20219100.0%5.8 pCi/L10.4 pCi/L31.8%Level
20207100.0%5.4 pCi/L40.2 pCi/L31.3%+28.6 points
20191471.4%4.5 pCi/L12.3 pCi/L33.7%+8.9 points
20182462.5%6.6 pCi/L16.3 pCi/L37.3%−5.2 points
20173167.7%5.8 pCi/L26.7 pCi/L37.3%+5.2 points
2016862.5%5.0 pCi/L10.6 pCi/L35.4%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 puts all of Sheridan County's mapped land in one class: high radon potential. 98.9% of it lies in the area the map calls Ogallala Formation, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Sheridan County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Ogallala FormationTertiary sandstone, in part covered by windblown eolian sand and loess deposits.High1298.9%
Smoky HillsCretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits.High121.1%

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

Sheridan County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 5 counties that border it, none has as large a share of high-potential ground; Decatur County comes nearest at 100%.

Share of land by USGS radon potential: Sheridan County, the 5 counties bordering it and Kansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Sheridan CountyZone 1NoneNone100%
Graham CountyZone 1NoneNone100%
Decatur CountyZone 1NoneNone100%
Gove CountyZone 1NoneNone100%
Thomas CountyZone 1NoneNone100%
Norton CountyZone 1NoneNone100%
Kansas105 counties, pooled by land areaVariesNone40.1%59.9%

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 Kansas's program says
Phone
(800) 693-5343

What it means

Sheridan County, Questions

Questions about radon in Sheridan County

Are radon levels high in Sheridan County?

In 2022, 60.0% of the radon tests reported to CDC for Sheridan County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.0 pCi/L. Of 45 Kansas counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 37.3%.

Which counties border Sheridan County?

Sheridan County borders 5 counties: Graham County, Decatur County, Gove County, Thomas County and Norton County.

Products

Sheridan County, Products

Testing a home in Sheridan County

In Sheridan County, 67.7% of 31 tests reported to CDC in 2017 reached 4 pCi/L, against 37.3% pooled across Kansas. In Zone 1 the year-round level in Sheridan 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

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

Explore

Sheridan County, Bordering counties

Counties bordering Sheridan County

Calculated by Radon411

Sheridan County, Cities and towns

Cities and towns in Sheridan County

About 2,427 people live in Sheridan County by the Census Bureau's estimate for July 1, 2025, 19 fewer than in 2020 (−0.8%). Spread over its land, that is 2.7 people to the square mile. Its largest town, Hoxie, has 1,188 residents, 48.9% of the total. Together its 2 incorporated places hold 56.6% of those residents; the other 43.4% live outside any of them. Testing is reported here more often than across the state: CDC's 31 reported tests for 2017 come to 12.8 for every 1,000 residents (2025 estimate), against 8.0 for Kansas.

From Hoxie to Selden, 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
Hoxie1,188−0.8%48.9%
Selden185−1.6%7.6%

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).

Sheridan County, Homes

Homes in Sheridan County

Sheridan County is a place of houses on their own lots: 91% of its 1,156 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1966 (1975 for Kansas), and 43% date from before 1960. Owners live in 75% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.

Homes in Sheridan County, Kansas, 2019 to 2023
HomesSheridan CountyKansas
Housing units1,1561,285,221
Detached houses91%72%
In buildings of 5 or more3%13%
Mobile homes5%4%
Built before 196043%33%
Built since 20006%20%
Middle year built19661975
Owner-occupied75%67%

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