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Radon Levels in Morris County, Kansas

EPA puts Morris County in Zone 2, its middle radon zone, and only 23 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

  • Share at 4+ pCi/L

    20.0%

    11.8 pts below KS

    Morris
    20.0%
    Kansas
    31.8%

    45 tests, 2021

  • Median result

    1.7pCi/L

    Below action level

    Morris
    1.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2021

  • Tests reported

    45

    53rd of 62 by tests

    Morris
    45
    Johnson
    25,860

    Reported to CDC before any fix, 2021

  • 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 Kansas

    55 of 62

    Lowest quarter

    Morris
    20.0%
    Norton
    93.8%

    By share, of 62 with 30+ tests

Read a result for Morris County

Starts at Morris County's median, 1.7 pCi/L

1.7pCi/L

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

EPA’s reading of 1.7 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Morris County's median reported result, 2021.

The data

Morris County, At a glance

Morris County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Morris 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: Moderate across 80% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Morris County, 2022

Share of reported tests at or above 4 pCi/L, by year, Morris County
Share of reported tests at or above 4 pCi/L, by year, Morris County
YearShare of reported tests at or above 4 pCi/L
201642.9%
201723.5%
201846.2%
201942.9%
202053.3%
202120.0%
202243.5%

2022: 43.5%. Across these years the share ran from 20.0% to 53.3%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 23 tests were reported to CDC for Morris 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

Morris County, Compared

Morris County radon figures, compared

Calculated by Radon411

Morris County's 45 reported tests in 2021 had a middle value of 1.7 pCi/L and a maximum of 10.4 pCi/L, and 20.0% reached 4 pCi/L. Kansas as a whole (96 Kansas counties, pooled) comes to 31.8%: 11.8 points higher than here.

The newest figure, in 2022, counts only 23 tests (43.5% at or above 4 pCi/L), too few to compare, so this reading uses the 45-test figure.

Among its state's counties it ranks 55th of 62 Kansas counties with 30 or more tests for the same period. Statewide for the same period, Norton County reported the highest share (93.8%) and Doniphan County the lowest (0.0%).

Below the action level, 27 tests (60.0%) came in under 2 pCi/L, against 45.3% statewide, and 9 tests (20.0%) fell between 2 and 4, against 22.9% statewide. The busiest year on file was 2021, with 45 tests reported; the quietest, 2016, had 7.

EPA's 1993 zone map puts Morris County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 80% of the county's land moderate radon potential.

Next door, the shares run from 29.6% in Geary County to 41.2% in Wabaunsee County.

CDC also counts 33 tests taken after mitigation in Morris County for the same period: tests in homes where a fix was already in.

Morris County against Kansas, the United States and nearby counties, 2021
AreaTestsAt or above 4 pCi/LMedianDifference from Morris County
Morris County4520.0%1.7 pCi/LThis county
Kansas, pooled96 counties, pooled69,90931.8%Not pooled+11.8 points
United States, pooled807 counties, pooled344,60424.4%Not pooled+4.4 points
Norton Countyhighest in the state4893.8%7.3 pCi/L+73.8 points
Doniphan Countylowest in the state330.0%1.7 pCi/L−20.0 points
Wabaunsee County, KSborders it10241.2%3.3 pCi/L+21.2 points
Lyon County, KSborders it11137.8%2.0 pCi/L+17.8 points
Dickinson County, KSborders it33037.3%2.5 pCi/L+17.3 points
Marion County, KSborders it9930.3%2.3 pCi/L+10.3 points
Geary County, KSborders it1,13429.6%2.2 pCi/L+9.6 points
Where Morris County's reported results fell, 2021, beside Kansas and the United States
ResultMorris County testsMorris County shareKansas shareU.S. shareAgainst Kansas
Under 2 pCi/L2760.0%45.3%54.4%+14.7 points
2 to 4 pCi/L920.0%22.9%21.2%−2.9 points
4 pCi/L and above920.0%31.8%24.4%−11.8 points
Morris County ranked among the 62 Kansas counties with 30 or more tests, by share at or above 4 pCi/L, 2021
CountyRankTestsAt or above 4 pCi/LMedian
Linn County50 of 624526.7%1.8 pCi/L
Pottawatomie County51 of 6292126.4%1.9 pCi/L
Butler County52 of 621,46726.4%2.0 pCi/L
Barton County53 of 6240225.4%0.9 pCi/L
Shawnee County54 of 621,39225.0%2.0 pCi/L
Morris County55 of 624520.0%1.7 pCi/L
Seward County56 of 623318.2%2.4 pCi/L
Reno County57 of 6264818.1%1.9 pCi/L
Sedgwick County58 of 6216,65015.9%1.2 pCi/L
Jackson County59 of 625715.8%1.6 pCi/L
Labette County60 of 624513.3%2.0 pCi/L
Morris County radon tests by year, against Kansas' pooled share
YearTestsAt or above 4 pCi/LMedianHighestKansas, pooledChange from the row before
20222343.5%3.5 pCi/L14.6 pCi/L32.0%+23.5 points
20214520.0%1.7 pCi/L10.4 pCi/L31.8%−33.3 points
20201553.3%4.5 pCi/L34.0 pCi/L31.3%+10.4 points
20192842.9%3.1 pCi/L58.0 pCi/L33.7%−3.3 points
20181346.2%3.9 pCi/L13.6 pCi/L37.3%+22.7 points
20171723.5%2.7 pCi/L9.8 pCi/L37.3%−19.4 points
2016742.9%2.5 pCi/L10.9 pCi/L35.4%First on file

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

Morris County, Geology

The ground under Morris County

Predicted

Most of the ground under Morris County is one class on USGS's geologic map: 80.0% of its land is moderate radon potential, with 20.0% high. The map puts 80.0% of Morris County in the area it calls Glaciated Area and 20.0% in Mid-Continent Rift Zone. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).

USGS's geologic areas under Morris County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glaciated AreaGlacial till underlain by Pennsylvanian and Permian marine and nonmarine sedimentary shale, sandstone, limestone, coal.Moderate980.0%
Mid-Continent Rift ZoneFaulted and fractured Permian limestone, dolomite, shale, and sandstone related to the Mid-Continent Rift zone.High1220.0%

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

Morris County beside the ground around it

Kansas as a whole has more high-potential ground than Morris County: 59.9% of its land, against 20.0% here. Of the 6 counties that border it, 3 have more high-potential ground, Dickinson County the most at 100%.

Share of land by USGS radon potential: Morris County, the 6 counties bordering it and Kansas
AreaEPA zoneLow potentialModerate potentialHigh potential
Morris CountyZone 2None80.0%20.0%
Geary CountyZone 1None12.8%87.2%
Chase CountyZone 2None100%None
Lyon CountyZone 2None100%None
Wabaunsee CountyZone 2None62.4%37.6%
Dickinson CountyZone 1NoneNone100%
Marion CountyZone 1None82.3%17.7%
Kansas105 counties, pooled by land areaVariesNone40.1%59.9%

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

What it means

Morris County, Questions

Questions about radon in Morris County

Are radon levels high in Morris County?

In 2022, 43.5% of the radon tests reported to CDC for Morris County, Kansas were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 62 Kansas counties with 30 or more tests for the same period, 54 reported a higher share; pooled, the state comes to 31.8%.

Which counties border Morris County?

Morris County borders 6 counties: Geary County, Chase County, Lyon County, Wabaunsee County, Dickinson County and Marion County.

Products

Morris County, Products

Testing a home in Morris County

In Morris County, 20.0% of 45 tests reported to CDC in 2021 reached 4 pCi/L, against 31.8% pooled across Kansas. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Morris County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Morris County homes, compared

Explore

Morris County, Bordering counties

Counties bordering Morris County

Calculated by Radon411

Morris County, Cities and towns

Cities and towns in Morris County

Morris County's population has barely moved since 2020: 5,348 residents on July 1, 2025 against 5,363 then, by the Census Bureau's estimates. Spread over its land, that is 7.7 people to the square mile. Its largest town, Council Grove, has 2,130 residents, 39.8% of the total. Reported testing is thin here: 45 tests over 2021, or 8.4 for every 1,000 residents (2025 estimate), where Kansas as a whole comes to 23.5.

From Council Grove to Dunlap, CDC publishes no figure by town: each reads Morris County's.

The cities and towns in Morris County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Council Grove2,130Level39.8%
Heringtonextends beyond Morris County2,101−0.4%Counted whole
White City442−1.1%8.3%
Dwight211−1.4%3.9%
Wilsey141+2.2%2.6%
Parkerville48Level0.9%
Latimer32Level0.6%
Dunlap28Level0.5%

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). A place that extends beyond Morris County is counted whole, so it has no share.

Morris County, Homes

Homes in Morris County

Morris County is a place of houses on their own lots: 82% of its 2,991 homes are detached single-family houses, against 72% across Kansas. The homes are older than Kansas' as a whole: half were built before 1955 (1975 for Kansas), and 55% date from before 1960. Owners live in 79% of the occupied homes (Kansas: 67%), so for most households a test and a fix are their own to order.

Homes in Morris County, Kansas, 2019 to 2023
HomesMorris CountyKansas
Housing units2,9911,285,221
Detached houses82%72%
In buildings of 5 or more4%13%
Mobile homes11%4%
Built before 196055%33%
Built since 200013%20%
Middle year built19551975
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.