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Radon Levels in Jennings County, Indiana

EPA puts Jennings County in Zone 1, its highest radon zone, and 35.1% of its 57 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

    35.1%

    3.8 pts below IN

    Jennings
    35.1%
    Indiana
    38.9%

    57 tests, 2008 to 2017

  • Median result

    2.8pCi/L

    Below action level

    Jennings
    2.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    57

    62nd of 69 by tests

    Jennings
    57
    St. Joseph
    7,346

    Reported to CDC before any fix, 2008 to 2017

  • 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 Indiana

    53 of 69

    Lowest quarter

    Jennings
    35.1%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Jennings County

Starts at Jennings County's median, 2.8 pCi/L

2.8pCi/L

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

EPA’s reading of 2.8 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. Jennings County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Jennings County, At a glance

Jennings County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Jennings 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 56% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Jennings County, 2008 to 2017, laboratory

Reported results by concentration band, Jennings County, 2008 to 2017, laboratory
Under 2 pCi/L: 33%2 to 4 pCi/L: 32%4 pCi/L and above: 35%

Of 57 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Jennings County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1933.3%
2 to 4 pCi/L1831.6%
4 pCi/L and above2035.1%
What these figures count

These are the 57 tests reported to CDC for Jennings 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

Jennings County, Compared

Jennings County radon figures, compared

Calculated by Radon411

In Jennings County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (20 of 57) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.6 points lower. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Jennings County runs 3.8 points below its state.

Of 5 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 27.3% (Jackson County) to 48.7% (Bartholomew County). By share, Jennings County is 53rd of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 23.3 pCi/L. Below the action level, 19 tests (33.3%) came in under 2 pCi/L, against 32.8% statewide, and 18 tests (31.6%) fell between 2 and 4, against 28.3% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 35.1% share point the same way here. USGS geology rates 56% of the county's land high radon potential.

CDC's ten-year totals for Jennings County went from 33 tests (2005 to 2014) to 57 (2008 to 2017), the share going from 42.4% to 35.1%.

Jennings County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Jennings County
Jennings County5735.1%2.8 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled+3.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+0.6 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+28.2 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−21.0 points
Bartholomew County, INborders it1,70748.7%3.9 pCi/L+13.6 points
Jefferson County, INborders it7245.8%3.1 pCi/L+10.7 points
Scott County, INborders it1735.3%2.0 pCi/L+0.2 points
Ripley County, INborders it6835.3%2.9 pCi/L+0.2 points
Decatur County, INborders it6333.3%2.8 pCi/L−1.8 points
Jackson County, INborders it8827.3%2.8 pCi/L−7.8 points
Where Jennings County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultJennings County testsJennings County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L1933.3%32.8%39.6%+0.5 points
2 to 4 pCi/L1831.6%28.3%24.7%+3.3 points
4 pCi/L and above2035.1%38.9%35.7%−3.8 points
Jennings 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
Tippecanoe County48 of 691,21836.8%2.7 pCi/L
White County49 of 694235.7%2.7 pCi/L
Lawrence County50 of 6926735.6%2.7 pCi/L
Posey County51 of 6921535.3%2.8 pCi/L
Ripley County52 of 696835.3%2.9 pCi/L
Jennings County53 of 695735.1%2.8 pCi/L
Daviess County54 of 695834.5%3.1 pCi/L
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
Jennings County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 20175735.1%2.8 pCi/L23.3 pCi/L38.9%+0.5 points
2007 to 20165234.6%2.9 pCi/L23.3 pCi/L39.2%−5.4 points
2006 to 20153540.0%3.1 pCi/L23.3 pCi/L39.6%−2.4 points
2005 to 20143342.4%3.0 pCi/L23.3 pCi/L39.3%First on file

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

Jennings County, Geology

The ground under Jennings County

Predicted

USGS's geologic map splits Jennings County: 55.7% of its land is high radon potential and 44.3% moderate. The map puts 53.6% of Jennings County in the area it calls New Albany Shale and 44.3% in Dearborn Upland, with one smaller area beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Jennings County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
New Albany ShaleNew Albany black shale.High1253.6%
Dearborn UplandOrdovician through Devonian limestone, dolostone, and gray shale, and pre-Wisconsinan glacial deposits.Moderate1044.3%
Huron-Erie LobeCalcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks.High132.1%

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

Jennings County beside the ground around it

On high-potential ground Jennings County is close to Indiana as a whole: 55.7% of its land against 56.6%. Of the 6 counties that border it, 3 have more high-potential ground, Bartholomew County the most at 70.7%.

Share of land by USGS radon potential: Jennings County, the 6 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Jennings CountyZone 1None44.3%55.7%
Jefferson CountyZone 2None76.2%23.8%
Ripley CountyZone 2None100%None
Scott CountyZone 1None38.4%61.6%
Bartholomew CountyZone 1None29.3%70.7%
Decatur CountyZone 1None33.5%66.5%
Jackson CountyZone 2None79.6%20.4%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Jennings County, Local resources

Radon testing and mitigation in Jennings 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

Jennings County, Questions

Questions about radon in Jennings County

Are radon levels high in Jennings County?

Over the 2008 to 2017 laboratory totals, 35.1% of the radon tests reported to CDC for Jennings County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 52 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Jennings County?

Jennings County borders 6 counties: Jefferson County, Ripley County, Scott County, Bartholomew County, Decatur County and Jackson County.

Products

Jennings County, Products

Testing a home in Jennings County

In Jennings County, 35.1% of 57 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 38.9% pooled across Indiana. In Zone 1 the year-round level in Jennings 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

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

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Jennings County, Bordering counties

Counties bordering Jennings County

Calculated by Radon411

Jennings County, Cities and towns

Cities and towns in Jennings County

Jennings County's population has barely moved since 2020: 27,622 residents on July 1, 2025 against 27,587 then, by the Census Bureau's estimates. That works out to 73 people per square mile of land. Its largest town, North Vernon, has 6,559 residents, 23.7% of the total. Together its 2 incorporated places hold 24.6% of those residents; the other 75.4% live outside any of them. Reported testing is thin here: 57 tests over 2008 to 2017, or 2.1 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From North Vernon to Vernon, CDC publishes no figure by town: each reads Jennings County's.

The cities and towns in Jennings County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
North Vernon6,559−0.8%23.7%
Vernon232−0.4%0.8%

2 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).

Jennings County, Homes

Homes in Jennings County

Of Jennings County's 11,691 homes, 73% are detached houses, against 73% across Indiana; 18% are mobile homes. Half of its homes were built before 1982, close to Indiana's 1976: 23% date from before 1960 and 19% from 2000 or later. Owners live in 79% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in Jennings County, Indiana, 2019 to 2023
HomesJennings CountyIndiana
Housing units11,6912,953,344
Detached houses73%73%
In buildings of 5 or more4%13%
Mobile homes18%4%
Built before 196023%32%
Built since 200019%21%
Middle year built19821976
Owner-occupied79%70%

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