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Radon Levels in Republic County, Kansas

EPA puts Republic County in Zone 1, its highest radon zone, and high results are common there: 52.9% of the 34 radon tests reported to CDC (2022) came back at or above 4 pCi/L. 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

    52.9%

    20.9 pts above KS

    Republic
    52.9%
    Kansas
    32.0%

    34 tests, 2022

  • Median result

    4.3pCi/L

    Action level reached

    Republic
    4.3 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2022

  • Tests reported

    34

    35th of 38 by tests

    Republic
    34
    Johnson
    5,240

    Reported to CDC before any fix, 2022

  • 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

    5 of 38

    Top quarter

    Republic
    52.9%
    Mitchell
    57.4%

    By share, of 38 with 30+ tests

Read a result for Republic County

Starts at Republic County's median, 4.3 pCi/L

4.3pCi/L

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

EPA’s reading of 4.3 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. Republic County's median reported result, 2022.

Interpret this readingWhat a fix costs

The data

Republic County, At a glance

Republic County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Republic 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 Republic County, 2022

Share of reported tests at or above 4 pCi/L, by year, Republic County
Share of reported tests at or above 4 pCi/L, by year, Republic County
YearShare of reported tests at or above 4 pCi/L
201647.2%
201751.5%
201859.0%
201952.4%
202054.5%
202157.1%
202252.9%

2022: 52.9%. Across these years the share ran from 47.2% to 59.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

These are the 34 tests reported to CDC for Republic County over 2022, many from homes being sold or already suspected of a problem: they describe the county's reported tests, not 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

Republic County, Compared

Republic County radon figures, compared

Calculated by Radon411

More than half: 52.9% of the 34 radon tests reported to CDC for Republic County in 2022 read at least 4 pCi/L. That places it 5th of 38 Kansas counties with 30 or more tests for the same period. That is 20.9 points above the 32.0% pooled from 96 Kansas counties.

The median result, 4.3 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 40.2 pCi/L. The rest split 26.5% under 2 pCi/L and 20.6% from 2 to 4 (Kansas: 45.8% and 22.1%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 52.9% share point the same way here.

Cloud County, the one bordering county with a figure for the same period, reported 54.6%. Statewide for the same period, Mitchell County reported the highest share (57.4%) and Crawford County the lowest (5.9%).

The busiest year on file was 2021, with 42 tests reported; the quietest, 2019, had 21.

Over 5 years of annual figures the share rose 5.7 points, from 47.2% in 2016 to 52.9% in 2022; its peak was 59.0% in 2018. Nationally, every county with a figure for the same period pools to 23.9%; Republic County sits 29.0 points above it. CDC also counts 6 tests taken after mitigation in Republic 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, Republic County against Kansas2016 to 2022, years with 30 or more tests: Republic County 47.2% to 52.9%, the state's pooled share 32.0% in 2022.
Republic CountyKansas, pooled
Share of reported tests at or above 4 pCi/L by year, Republic County against Kansas: data table
YearTestsRepublic County, at or above 4 pCi/LKansas, pooled
20163647.2%35.4%
20173351.5%37.3%
20183959.0%37.3%
20214257.1%31.8%
20223452.9%32.0%
Republic County against Kansas, the United States and nearby counties, 2022
AreaTestsAt or above 4 pCi/LMedianDifference from Republic County
Republic County3452.9%4.3 pCi/LThis county
Kansas, pooled96 counties, pooled18,38532.0%Not pooled−20.9 points
United States, pooled853 counties, pooled333,14023.9%Not pooled−29.0 points
Mitchell Countyhighest in the state4757.4%6.2 pCi/L+4.5 points
Crawford Countylowest in the state345.9%0.8 pCi/L−47.0 points
Jewell County, KSborders it1258.3%9.3 pCi/L+5.4 points
Cloud County, KSborders it9754.6%4.3 pCi/L+1.7 points
Nuckolls County, NEborders it1353.8%4.0 pCi/L+0.9 points
Washington County, KSborders it1643.8%3.3 pCi/L−9.1 points
Jefferson County, NEborders it2142.9%3.1 pCi/L−10.0 points
Thayer County, NEborders it1931.6%3.4 pCi/L−21.3 points
Where Republic County's reported results fell, 2022, beside Kansas and the United States
ResultRepublic County testsRepublic County shareKansas shareU.S. shareAgainst Kansas
Under 2 pCi/L926.5%45.8%54.5%−19.3 points
2 to 4 pCi/L720.6%22.1%21.7%−1.5 points
4 pCi/L and above1852.9%32.0%23.9%+20.9 points
Republic County ranked among the 38 Kansas counties with 30 or more tests, by share at or above 4 pCi/L, 2022
CountyRankTestsAt or above 4 pCi/LMedian
Mitchell County1 of 384757.4%6.2 pCi/L
Clay County2 of 387755.8%4.8 pCi/L
Cloud County3 of 389754.6%4.3 pCi/L
Barton County4 of 383953.8%4.1 pCi/L
Republic County5 of 383452.9%4.3 pCi/L
Saline County6 of 3872952.3%4.2 pCi/L
McPherson County7 of 3821551.6%4.1 pCi/L
Pawnee County8 of 385343.4%3.7 pCi/L
Atchison County9 of 386041.7%3.3 pCi/L
Johnson County10 of 385,24041.2%3.0 pCi/L
Miami County11 of 3821440.2%3.0 pCi/L
Republic County radon tests by year, against Kansas' pooled share
YearTestsAt or above 4 pCi/LMedianHighestKansas, pooledChange from the row before
20223452.9%4.3 pCi/L40.2 pCi/L32.0%−4.2 points
20214257.1%5.2 pCi/L28.5 pCi/L31.8%+2.6 points
20202254.5%4.3 pCi/L26.8 pCi/L31.3%+2.1 points
20192152.4%4.4 pCi/L15.7 pCi/L33.7%−6.6 points
20183959.0%5.8 pCi/L29.0 pCi/L37.3%+7.5 points
20173351.5%4.8 pCi/L40.0 pCi/L37.3%+4.3 points
20163647.2%3.8 pCi/L35.4 pCi/L35.4%First on file

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

Republic County, Geology

The ground under Republic County

Predicted

USGS's geologic map puts all of Republic County's mapped land in one class: high radon potential. All of it lies in the area the map calls Smoky Hills, to which USGS gives a radon index of 12, in the high band (12 to 17).

USGS's geologic areas under Republic County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Smoky HillsCretaceous marine sandstone, shale, and siltstone covered by discontinuous loess deposits.High12100%

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

Republic County beside the ground around it

Republic County has more high-potential ground than Kansas as a whole: 100% of its land against 59.9%. Of the 6 counties that border it, none has as large a share of high-potential ground; Cloud County comes nearest at 100%.

Share of land by USGS radon potential: Republic County, the 6 counties bordering it and Kansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Republic CountyZone 1NoneNone100%
Thayer County, NEZone 1NoneNone100%
Cloud CountyZone 1NoneNone100%
Washington CountyZone 1None17.3%82.7%
Jewell CountyZone 1NoneNone100%
Nuckolls County, NEZone 1NoneNone100%
Jefferson County, NEZone 1NoneNone100%
Kansas105 counties, pooled by land areaVariesNone40.1%59.9%

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

Local help

Republic County, Local resources

Radon testing and mitigation in Republic County

Listed radon businesses with an address in Republic County:

Listed radon professionals by town: Belleville

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

What it means

Republic County, Questions

Questions about radon in Republic County

Are radon levels high in Republic County?

In 2022, 52.9% of the radon tests reported to CDC for Republic County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.3 pCi/L. Of 38 Kansas counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 32.0%.

Which counties border Republic County?

Republic County borders 6 counties: Thayer County, NE, Cloud County, KS, Washington County, KS, Jewell County, KS, Nuckolls County, NE and Jefferson County, NE.

Products

Republic County, Products

Testing a home in Republic County

In Republic County, 52.9% of 34 tests reported to CDC in 2022 reached 4 pCi/L, against 32.0% pooled across Kansas. In Zone 1 the year-round level in Republic 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

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

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Republic County, Bordering counties

Counties bordering Republic County

Calculated by Radon411

Republic County, Cities and towns

Cities and towns in Republic County

About 4,640 people live in Republic County by the Census Bureau's estimate for July 1, 2025, 37 fewer than in 2020 (−0.8%). Spread over its land, that is 6.5 people to the square mile. Its largest town, Belleville, has 1,986 residents, 42.8% of the total. Together its 8 incorporated places hold 65.9% of those residents; the other 34.1% live outside any of them. CDC's 34 reported tests for 2022 work out to 7.3 per 1,000 residents (2025 estimate), close to Kansas' 6.2.

From Belleville to Agenda, CDC publishes no figure by town: each reads Republic County's.

The cities and towns in Republic County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Belleville1,986−0.5%42.8%
Scandia340−1.2%7.3%
Courtland291−0.7%6.3%
Cuba137−1.4%3.0%
Munden98Level2.1%
Narka82−2.4%1.8%
Republic80−2.4%1.7%
Agenda46−2.1%1.0%

8 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).

Republic County, Homes

Homes in Republic County

Republic County is a place of houses on their own lots: 88% of its 2,672 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1941 (1975 for Kansas), and 69% date from before 1960. Owners live in 76% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.

Homes in Republic County, Kansas, 2019 to 2023
HomesRepublic CountyKansas
Housing units2,6721,285,221
Detached houses88%72%
In buildings of 5 or more6%13%
Mobile homes3%4%
Built before 196069%33%
Built since 20004%20%
Middle year built19411975
Owner-occupied76%67%

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