Skip to content
RADON411

Locations and reports

Radon Levels in Daviess County, Missouri

EPA puts Daviess 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    26.7%

    3.9 pts below MO

    Daviess
    26.7%
    Missouri
    30.6%

    30 tests, 2008 to 2017

  • Median result

    2.0pCi/L

    Below action level

    Daviess
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    30

    71st of 72 by tests

    Daviess
    30
    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

    45 of 72

    Middle half

    Daviess
    26.7%
    Atchison
    69.9%

    By share, of 72 with 30+ tests

Read a result for Daviess County

Starts at Daviess County's median, 2.0 pCi/L

2.0pCi/L

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

EPA’s reading of 2.0 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. Daviess County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Daviess County, At a glance

Daviess County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Daviess 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 Daviess County, 2023

Share of reported tests at or above 4 pCi/L, by year, Daviess County
Share of reported tests at or above 4 pCi/L, by year, Daviess County
YearShare of reported tests at or above 4 pCi/L
20140.0%
20150.0%
20160.0%
20170.0%
202166.7%
20230.0%

2023: 0.0%. Across these years the share ran from 0.0% to 66.7%. Each column counts radon tests reported to CDC that year, not homes.

What these figures count

Only 1 test was reported to CDC for Daviess 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

Daviess County, Compared

Daviess County radon figures, compared

Calculated by Radon411

Daviess County's 30 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.0 pCi/L and a maximum of 15.4 pCi/L, and 26.7% reached 4 pCi/L. Missouri as a whole (115 Missouri counties, pooled) comes to 30.6%: 3.9 points higher than here.

The newest figure, in 2023, counts only 1 test (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 30-test figure.

Among its state's counties it ranks 45th 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, 15 tests (50.0%) came in under 2 pCi/L, against 41.2% statewide, and 7 tests (23.3%) fell between 2 and 4, against 28.1% statewide. The busiest year on file was 2016, with 3 tests reported; the quietest, 2023, had 1.

EPA's 1993 zone map puts Daviess 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 22.4% in Livingston County to 24.2% in DeKalb County, with DeKalb County and Livingston County below Daviess County.

Daviess County against Missouri, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Daviess County
Daviess County3026.7%2.0 pCi/LThis county
Missouri, pooled115 counties, pooled58,52530.6%Not pooled+3.9 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+9.0 points
Atchison Countyhighest in the state10369.9%5.6 pCi/L+43.2 points
Vernon Countylowest in the state348.8%0.9 pCi/L−17.9 points
Gentry County, MOborders it2441.7%3.5 pCi/L+15.0 points
Grundy County, MOborders it2737.0%2.8 pCi/L+10.3 points
Harrison County, MOborders it2429.2%1.9 pCi/L+2.5 points
DeKalb County, MOborders it3324.2%2.3 pCi/L−2.5 points
Livingston County, MOborders it4922.4%2.1 pCi/L−4.3 points
Caldwell County, MOborders it166.3%1.5 pCi/L−20.4 points
Where Daviess County's reported results fell, 2008 to 2017, laboratory, beside Missouri and the United States
ResultDaviess County testsDaviess County shareMissouri shareU.S. shareAgainst Missouri
Under 2 pCi/L1550.0%41.2%39.6%+8.8 points
2 to 4 pCi/L723.3%28.1%24.7%−4.8 points
4 pCi/L and above826.7%30.6%35.7%−3.9 points
Daviess 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
Scott County40 of 725129.4%2.2 pCi/L
Jasper County41 of 7225129.1%2.0 pCi/L
Adair County42 of 729227.2%1.8 pCi/L
Lawrence County43 of 727027.1%1.8 pCi/L
Callaway County44 of 7219227.1%1.7 pCi/L
Daviess County45 of 723026.7%2.0 pCi/L
St. Charles County46 of 727,00126.5%2.2 pCi/L
St. Louis County47 of 7217,74726.3%2.3 pCi/L
Washington County48 of 723826.3%1.5 pCi/L
Johnson County49 of 7226425.8%1.9 pCi/L
Moniteau County50 of 726825.0%2.2 pCi/L
Daviess County radon tests by year, against Missouri's pooled share
YearTestsAt or above 4 pCi/LMedianHighestMissouri, pooledChange from the row before
202310.0%2.8 pCi/L2.8 pCi/L35.7%−66.7 points
2021366.7%4.2 pCi/L7.3 pCi/L31.8%+66.7 points
201710.0%3.0 pCi/L3.0 pCi/L37.0%Level
201630.0%2.3 pCi/L3.5 pCi/L29.8%Level
201510.0%1.8 pCi/L1.8 pCi/L27.6%Level
201410.0%3.0 pCi/L3.0 pCi/L34.4%First on file

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

Daviess County, Geology

The ground under Daviess County

Predicted

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

USGS's geologic areas under Daviess County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Dissected Till PlainsTill-covered Pennsylvanian sandstone, shale, and limestone.Moderate11100%

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

Daviess County beside the ground around it

Across Missouri 8.2% of the land is rated high; none of Daviess County's is. Of the 6 counties that border it, 2 have more high-potential ground, DeKalb County the most at 20.5%.

Share of land by USGS radon potential: Daviess County, the 6 counties bordering it and Missouri
AreaEPA zoneLow potentialModerate potentialHigh potential
Daviess CountyZone 2None100%None
Caldwell CountyZone 2None100%None
Harrison CountyZone 2None99.9%0.1%
DeKalb CountyZone 2None79.5%20.5%
Grundy CountyZone 2None100%None
Livingston CountyZone 2None100%None
Gentry 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

Daviess County, Local resources

Radon testing and mitigation in Daviess County

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

What it means

Daviess County, Questions

Questions about radon in Daviess County

Are radon levels high in Daviess County?

In 2023, 0.0% of the radon tests reported to CDC for Daviess County, Missouri were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 72 Missouri counties with 30 or more tests for the same period, 44 reported a higher share; pooled, the state comes to 30.6%.

Which counties border Daviess County?

Daviess County borders 6 counties: Caldwell County, Harrison County, DeKalb County, Grundy County, Livingston County and Gentry County.

Products

Daviess County, Products

Testing a home in Daviess County

In Daviess County, 26.7% of 30 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 Daviess County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Daviess County homes, compared

Explore

Daviess County, Bordering counties

Counties bordering Daviess County

Calculated by Radon411

Daviess County, Cities and towns

Cities and towns in Daviess County

The Census Bureau estimates 8,558 residents in Daviess County for July 1, 2025, 123 more than in 2020 (+1.5%). That works out to 15 people per square mile of land. Its largest town, Gallatin, has 1,848 residents, 21.6% of the total. Reported testing is thin here: 30 tests over 2008 to 2017, or 3.5 for every 1,000 residents (2025 estimate), where Missouri as a whole comes to 9.3.

From Gallatin to Lock Springs, CDC publishes no figure by town: each reads Daviess County's.

The cities and towns in Daviess County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Gallatin1,848+1.3%21.6%
Jamesport570+1.2%6.7%
Pattonsburg341+1.8%4.0%
Gilman Cityextends beyond Daviess County337+1.8%Counted whole
Winston232+1.3%2.7%
Altamont172+3.6%2.0%
Coffey153+2.7%1.8%
Jameson71+2.9%0.8%
Lock Springs40+2.6%0.5%

9 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 Daviess County is counted whole, so it has no share.

Daviess County, Homes

Homes in Daviess County

Daviess County is a place of houses on their own lots: 81% of its 4,140 homes are detached single-family houses, against 70% across Missouri. Half of its homes were built before 1976, close to Missouri's 1978: 32% date from before 1960 and 26% from 2000 or later. Owners live in 78% of the occupied homes (Missouri: 68%), so for most households a test and a fix are their own to order.

Homes in Daviess County, Missouri, 2019 to 2023
HomesDaviess CountyMissouri
Housing units4,1402,809,501
Detached houses81%70%
In buildings of 5 or more3%13%
Mobile homes12%5%
Built before 196032%28%
Built since 200026%21%
Middle year built19761978
Owner-occupied78%68%

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