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Radon Levels in Morgan County, Missouri

EPA puts Morgan County in Zone 2, its middle radon zone, and only 1 radon test from it is on file with CDC (2023). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    21.1%

    9.5 pts below MO

    Morgan
    21.1%
    Missouri
    30.6%

    123 tests, 2008 to 2017

  • Median result

    2.2pCi/L

    Below action level

    Morgan
    2.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    123

    35th of 72 by tests

    Morgan
    123
    St. Louis
    17,747

    Reported to CDC before any fix, 2008 to 2017

  • 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 Missouri

    58 of 72

    Lowest quarter

    Morgan
    21.1%
    Atchison
    69.9%

    By share, of 72 with 30+ tests

Read a result for Morgan County

Starts at Morgan County's median, 2.2 pCi/L

2.2pCi/L

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

EPA’s reading of 2.2 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. Morgan County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Morgan County, At a glance

Morgan County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Morgan 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 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Morgan County, 2023

Share of reported tests at or above 4 pCi/L, by year, Morgan County
Share of reported tests at or above 4 pCi/L, by year, Morgan County
YearShare of reported tests at or above 4 pCi/L
201433.3%
20150.0%
201640.0%
20180.0%
20190.0%
20200.0%
202166.7%
202250.0%
2023100.0%

2023: 100.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 1 test was reported to CDC for Morgan 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

Morgan County, Compared

Morgan County radon figures, compared

Calculated by Radon411

Morgan County's 123 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.2 pCi/L and a maximum of 15.3 pCi/L, and 21.1% reached 4 pCi/L. Missouri as a whole (115 Missouri counties, pooled) comes to 30.6%: 9.5 points higher than here.

The newest figure, in 2023, counts only 1 test (100.0% at or above 4 pCi/L), too few to compare, so this reading uses the 123-test figure.

Among its state's counties it ranks 58th of 72 Missouri counties with 30 or more tests for the same period. Statewide for the same period, Atchison County reported the highest share (69.9%) and Vernon County the lowest (8.8%).

Below the action level, 56 tests (45.5%) came in under 2 pCi/L, against 41.2% statewide, and 41 tests (33.3%) fell between 2 and 4, against 28.1% statewide. The busiest year on file was 2014, with 6 tests reported; the quietest, 2023, had 1.

EPA's 1993 zone map puts Morgan County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 16.9% in Miller County to 41.1% in Cooper County, with Miller County below Morgan County.

Morgan County against Missouri, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Morgan County
Morgan County12321.1%2.2 pCi/LThis county
Missouri, pooled115 counties, pooled58,52530.6%Not pooled+9.5 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+14.6 points
Atchison Countyhighest in the state10369.9%5.6 pCi/L+48.8 points
Vernon Countylowest in the state348.8%0.9 pCi/L−12.3 points
Cooper County, MOborders it9041.1%2.6 pCi/L+20.0 points
Pettis County, MOborders it13237.9%2.8 pCi/L+16.8 points
Benton County, MOborders it4930.6%2.0 pCi/L+9.5 points
Moniteau County, MOborders it6825.0%2.2 pCi/L+3.9 points
Camden County, MOborders it76322.9%2.2 pCi/L+1.8 points
Miller County, MOborders it15416.9%1.9 pCi/L−4.2 points
Where Morgan County's reported results fell, 2008 to 2017, laboratory, beside Missouri and the United States
ResultMorgan County testsMorgan County shareMissouri shareU.S. shareAgainst Missouri
Under 2 pCi/L5645.5%41.2%39.6%+4.3 points
2 to 4 pCi/L4133.3%28.1%24.7%+5.2 points
4 pCi/L and above2621.1%30.6%35.7%−9.5 points
Morgan County ranked among the 72 Missouri counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Monroe County53 of 723023.3%1.5 pCi/L
Camden County54 of 7276322.9%2.2 pCi/L
Livingston County55 of 724922.4%2.1 pCi/L
Boone County56 of 724,76721.7%1.9 pCi/L
Butler County57 of 723321.2%1.9 pCi/L
Morgan County58 of 7212321.1%2.2 pCi/L
Webster County59 of 7210320.4%1.6 pCi/L
Macon County60 of 723619.4%1.7 pCi/L
Texas County61 of 725719.3%1.3 pCi/L
Linn County62 of 723718.9%1.8 pCi/L
Pulaski County63 of 7210718.7%1.3 pCi/L
Morgan County radon tests by year, against Missouri's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMissouri, pooledChange from the row before
20231100.0%4.9 pCi/L4.9 pCi/L35.7%+50.0 points
2022650.0%3.5 pCi/L5.8 pCi/L40.8%−16.7 points
2021366.7%6.7 pCi/L19.9 pCi/L31.8%+66.7 points
202010.0%2.3 pCi/L2.3 pCi/L33.2%Level
201910.0%3.6 pCi/L3.6 pCi/L33.5%Level
201810.0%0.9 pCi/L0.9 pCi/L42.1%−40.0 points
2016540.0%3.4 pCi/L9.2 pCi/L29.8%+40.0 points
201520.0%1.1 pCi/L1.6 pCi/L27.6%−33.3 points
2014633.3%3.0 pCi/L9.4 pCi/L34.4%First on file

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

Morgan County, Geology

The ground under Morgan County

Predicted

USGS's geologic map puts all of Morgan County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Salem Plateau, to which USGS gives a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Morgan County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Salem PlateauOrdovician dolomite, sandstone, limestone, and shale.Moderate11100%

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

Morgan County beside the ground around it

Across Missouri 8.2% of the land is rated high; none of Morgan County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Camden County comes nearest at 100%.

Share of land by USGS radon potential: Morgan County, the 6 counties bordering it and Missouri
AreaEPA zoneLow potentialModerate potentialHigh potential
Morgan CountyZone 2None100%None
Moniteau CountyZone 2None100%None
Cooper CountyZone 2None100%None
Benton CountyZone 2None100%None
Miller CountyZone 2None100%None
Pettis CountyZone 2None100%None
Camden CountyZone 2None100%None
Missouri115 counties, pooled by land areaVaries5.8%86.0%8.2%

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

Local help

Morgan County, Local resources

Radon testing and mitigation in Morgan County

What Missouri's program says
Phone
573-751-6102
Email
radon@health.mo.gov

What it means

Morgan County, Questions

Questions about radon in Morgan County

Are radon levels high in Morgan County?

In 2023, 100.0% of the radon tests reported to CDC for Morgan County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.9 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 57 reported a higher share; pooled, the state comes to 30.6%.

Which counties border Morgan County?

Morgan County borders 6 counties: Moniteau County, Cooper County, Benton County, Miller County, Pettis County and Camden County.

Products

Morgan County, Products

Testing a home in Morgan County

In Morgan County, 21.1% of 123 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 30.6% pooled across Missouri. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Morgan County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Morgan County homes, compared

Explore

Morgan County, Bordering counties

Counties bordering Morgan County

Calculated by Radon411

Morgan County, Cities and towns

Cities and towns in Morgan County

Morgan County is growing: the Census Bureau puts it at 22,418 residents on July 1, 2025, up 6.8% from 20,997 in 2020. That works out to 38 people per square mile of land. No town dominates: Versailles, the largest, has 2,713 residents, 12.1% of the total. Reported testing is thin here: 123 tests over 2008 to 2017, or 5.5 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.

From Versailles to Gravois Mills, CDC publishes no figure by town: each reads Morgan County's.

The cities and towns in Morgan County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Versailles2,713+7.0%12.1%
Laurieextends beyond Morgan County1,087+15.9%Counted whole
Stover1,064+5.1%4.7%
Sunrise Beachextends beyond Morgan County533+26.3%Counted whole
Barnett165+4.4%0.7%
Syracuse162+5.9%0.7%
Gravois Mills139+6.1%0.6%

7 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 Morgan County is counted whole, so it has no share.

Morgan County, Homes

Homes in Morgan County

Morgan County is a place of houses on their own lots: 75% of its 15,161 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1982, close to Missouri's 1978: 18% date from before 1960 and 24% from 2000 or later. Owners live in 80% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.

Homes in Morgan County, Missouri, 2019 to 2023
HomesMorgan CountyMissouri
Housing units15,1612,809,501
Detached houses75%70%
In buildings of 5 or more6%13%
Mobile homes17%5%
Built before 196018%28%
Built since 200024%21%
Middle year built19821978
Owner-occupied80%68%

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