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Radon Levels in Greene County, Indiana

EPA puts Greene County in Zone 2, its middle radon zone, and 32.7% of its 49 reported radon tests (2008 to 2017, laboratory totals) were 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

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  • Share at 4+ pCi/L

    32.7%

    6.2 pts below IN

    Greene
    32.7%
    Indiana
    38.9%

    49 tests, 2008 to 2017

  • Median result

    3.0pCi/L

    Below action level

    Greene
    3.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    49

    64th of 69 by tests

    Greene
    49
    St. Joseph
    7,346

    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 Indiana

    60 of 69

    Lowest quarter

    Greene
    32.7%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Greene County

Starts at Greene County's median, 3.0 pCi/L

3.0pCi/L

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

EPA’s reading of 3.0 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. Greene County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Greene County, At a glance

Greene County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Greene 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 Greene County, 2008 to 2017, laboratory

Reported results by concentration band, Greene County, 2008 to 2017, laboratory
Under 2 pCi/L: 37%2 to 4 pCi/L: 30%4 pCi/L and above: 33%

Of 49 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Greene County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1836.7%
2 to 4 pCi/L1530.6%
4 pCi/L and above1632.7%
What these figures count

These are the 49 tests reported to CDC for Greene County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Greene County, Compared

Greene County radon figures, compared

Calculated by Radon411

In Greene County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (16 of 49) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 3.0 points lower. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Greene County runs 6.2 points below its state.

Of 5 neighbours with a figure, all 5 reported a larger share at or above 4 pCi/L; the spread is 34.2% (Monroe County) to 43.1% (Knox County). By share, Greene County is 60th of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 3.0 pCi/L and half over it; the single highest reached 23.4 pCi/L. Below the action level, 18 tests (36.7%) came in under 2 pCi/L, against 32.8% statewide, and 15 tests (30.6%) fell between 2 and 4, against 28.3% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 32.7% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

CDC's ten-year totals for Greene County went from 37 tests (2005 to 2014) to 49 (2008 to 2017), the share going from 35.1% to 32.7%.

Greene County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Greene County
Greene County4932.7%3.0 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled+6.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+3.0 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+30.6 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−18.6 points
Sullivan County, INborders it1346.2%3.1 pCi/L+13.5 points
Knox County, INborders it5843.1%3.4 pCi/L+10.4 points
Owen County, INborders it11039.1%2.8 pCi/L+6.4 points
Martin County, INborders it837.5%3.7 pCi/L+4.8 points
Lawrence County, INborders it26735.6%2.7 pCi/L+2.9 points
Daviess County, INborders it5834.5%3.1 pCi/L+1.8 points
Monroe County, INborders it2,37534.2%2.8 pCi/L+1.5 points
Clay County, INborders it2326.1%2.9 pCi/L−6.6 points
Where Greene County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultGreene County testsGreene County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L1836.7%32.8%39.6%+3.9 points
2 to 4 pCi/L1530.6%28.3%24.7%+2.3 points
4 pCi/L and above1632.7%38.9%35.7%−6.2 points
Greene County ranked among the 69 Indiana counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Putnam County55 of 6911934.5%2.7 pCi/L
Monroe County56 of 692,37534.2%2.8 pCi/L
Cass County57 of 699134.1%2.6 pCi/L
Hancock County58 of 6927133.9%2.6 pCi/L
Decatur County59 of 696333.3%2.8 pCi/L
Greene County60 of 694932.7%3.0 pCi/L
Dearborn County61 of 6913630.1%2.6 pCi/L
St. Joseph County62 of 697,34629.3%2.7 pCi/L
Franklin County63 of 695028.0%2.1 pCi/L
Jackson County64 of 698827.3%2.8 pCi/L
Brown County65 of 6911225.9%2.8 pCi/L
Greene County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 20174932.7%3.0 pCi/L23.4 pCi/L38.9%−3.5 points
2007 to 20164736.2%3.1 pCi/L23.4 pCi/L39.2%+0.5 points
2006 to 20154235.7%3.1 pCi/L23.4 pCi/L39.6%+0.6 points
2005 to 20143735.1%3.0 pCi/L23.4 pCi/L39.3%First on file

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

Greene County, Geology

The ground under Greene County

Predicted

USGS's geologic map puts all of Greene County's mapped land in one class: moderate radon potential. The map puts 66.0% of Greene County in the area it calls Wabash Lowland and 34.0% in Crawford Upland/Mitchell Plain/Norman Upland. USGS gives the first a radon index of 10 and the second 11, both in the moderate band (9 to 11).

USGS's geologic areas under Greene County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Wabash LowlandLoess, pre-Wisconsinan glacial deposits, Pennsylvanian shale, sandstone, and carbonate bedrock.Moderate1066.0%
Crawford Upland/Mitchell Plain/Norman UplandUnglaciated, underlain by karsted Mississippian carbonate rocks.Moderate1134.0%

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

Greene County beside the ground around it

Across Indiana 56.6% of the land is rated high; none of Greene County's is. Of the 8 counties that border it, none has as large a share of moderate-potential ground; Daviess County comes nearest at 100%.

Share of land by USGS radon potential: Greene County, the 8 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Greene CountyZone 2None100%None
Owen CountyZone 2None100%None
Clay CountyZone 2None100%None
Martin CountyZone 2None100%None
Sullivan CountyZone 2None100%None
Monroe CountyZone 1None100%None
Daviess CountyZone 2None100%None
Lawrence CountyZone 1None100%None
Knox CountyZone 2None100%None
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Greene County, Local resources

Radon testing and mitigation in Greene County

What Indiana's program says
Phone
1-800-272-9723
Licensing of radon professionals
According to the Indiana Radon Rule, 410 IAC 5.1, everyone who is serving Indiana by doing radon testing, analysis and mitigation (radon reduction) in residential structures must be certified by the Indiana State Department of Health.

What it means

Greene County, Questions

Questions about radon in Greene County

Are radon levels high in Greene County?

Over the 2008 to 2017 laboratory totals, 32.7% of the radon tests reported to CDC for Greene County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 59 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Greene County?

Greene County borders 8 counties: Owen County, Clay County, Martin County, Sullivan County, Monroe County, Daviess County, Lawrence County and Knox County.

Products

Greene County, Products

Testing a home in Greene County

In Greene County, 32.7% of 49 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 38.9% pooled across Indiana. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Greene County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Greene County homes, compared

Explore

Greene County, Bordering counties

Counties bordering Greene County

Calculated by Radon411

Greene County, Cities and towns

Cities and towns in Greene County

The Census Bureau estimates 31,165 residents in Greene County for July 1, 2025, 362 more than in 2020 (+1.2%). That works out to 57 people per square mile of land. No town dominates: Linton, the largest, has 5,245 residents, 16.8% of the total. Together its 7 incorporated places hold 38.4% of those residents; the other 61.6% live outside any of them. Reported testing is thin here: 49 tests over 2008 to 2017, or 1.6 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From Linton to Newberry, CDC publishes no figure by town: each reads Greene County's.

The cities and towns in Greene County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Linton5,245+0.3%16.8%
Bloomfield2,306+0.7%7.4%
Jasonville1,952−1.7%6.3%
Worthington1,403+0.9%4.5%
Lyons638+2.1%2.0%
Switz City273+1.9%0.9%
Newberry160Level0.5%

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).

Greene County, Homes

Homes in Greene County

Greene County is a place of houses on their own lots: 75% of its 14,366 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1977, close to Indiana's 1976: 32% date from before 1960 and 17% from 2000 or later. Owners live in 75% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in Greene County, Indiana, 2019 to 2023
HomesGreene CountyIndiana
Housing units14,3662,953,344
Detached houses75%73%
In buildings of 5 or more3%13%
Mobile homes17%4%
Built before 196032%32%
Built since 200017%21%
Middle year built19771976
Owner-occupied75%70%

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