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Radon Levels in Ripley County, Indiana

EPA puts Ripley County in Zone 2, its middle radon zone, and 35.3% of its 68 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

    35.3%

    3.6 pts below IN

    Ripley
    35.3%
    Indiana
    38.9%

    68 tests, 2008 to 2017

  • Median result

    2.9pCi/L

    Below action level

    Ripley
    2.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    68

    56th of 69 by tests

    Ripley
    68
    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

    52 of 69

    Middle half

    Ripley
    35.3%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Ripley County

Starts at Ripley County's median, 2.9 pCi/L

2.9pCi/L

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

EPA’s reading of 2.9 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. Ripley County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Ripley County, At a glance

Ripley County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Ripley 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 Ripley County, 2008 to 2017, laboratory

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

Of 68 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Ripley County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2232.4%
2 to 4 pCi/L2232.4%
4 pCi/L and above2435.3%
What these figures count

These are the 68 tests reported to CDC for Ripley 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

Ripley County, Compared

Ripley County radon figures, compared

Calculated by Radon411

In Ripley County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (24 of 68) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 0.4 points lower. Across 92 Indiana counties pooled together, 38.9% of tests reached that level, so Ripley County runs 3.6 points below its state.

Of 5 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 28.0% (Franklin County) to 45.8% (Jefferson County). By share, Ripley County is 52nd of 69 Indiana counties with 30 or more tests for the same period.

Half the tests came in under 2.9 pCi/L and half over it; the single highest reached 12.6 pCi/L. Below the action level, 22 tests (32.4%) came in under 2 pCi/L, against 32.8% statewide, and 22 tests (32.4%) 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 35.3% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 12 tests taken after mitigation in Ripley County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Ripley County went from 47 tests (2005 to 2014) to 68 (2008 to 2017), the share going from 38.3% to 35.3%.

Ripley County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Ripley County
Ripley County6835.3%2.9 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled+3.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+0.4 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+28.0 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−21.2 points
Ohio County, INborders it2152.4%4.1 pCi/L+17.1 points
Jefferson County, INborders it7245.8%3.1 pCi/L+10.5 points
Jennings County, INborders it5735.1%2.8 pCi/L−0.2 points
Decatur County, INborders it6333.3%2.8 pCi/L−2.0 points
Switzerland County, INborders it1533.3%1.5 pCi/L−2.0 points
Dearborn County, INborders it13630.1%2.6 pCi/L−5.2 points
Franklin County, INborders it5028.0%2.1 pCi/L−7.3 points
Where Ripley County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultRipley County testsRipley County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L2232.4%32.8%39.6%−0.4 points
2 to 4 pCi/L2232.4%28.3%24.7%+4.1 points
4 pCi/L and above2435.3%38.9%35.7%−3.6 points
Ripley 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
Hamilton County47 of 693,47937.6%2.7 pCi/L
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
Ripley County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 20176835.3%2.9 pCi/L12.6 pCi/L38.9%−5.1 points
2007 to 20165240.4%3.0 pCi/L12.6 pCi/L39.2%−0.8 points
2006 to 20155141.2%3.0 pCi/L12.6 pCi/L39.6%+2.9 points
2005 to 20144738.3%3.0 pCi/L12.6 pCi/L39.3%First on file

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

Ripley County, Geology

The ground under Ripley County

Predicted

USGS's geologic map puts all of Ripley County's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Dearborn Upland, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Ripley County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Dearborn UplandOrdovician through Devonian limestone, dolostone, and gray shale, and pre-Wisconsinan glacial deposits.Moderate10100%

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

Ripley County beside the ground around it

Across Indiana 56.6% of the land is rated high; none of Ripley County's is. Of the 7 counties that border it, 4 have more high-potential ground, Decatur County the most at 66.5%.

Share of land by USGS radon potential: Ripley County, the 7 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Ripley CountyZone 2None100%None
Dearborn CountyZone 2None100%None
Jennings CountyZone 1None44.3%55.7%
Ohio CountyZone 2None100%None
Decatur CountyZone 1None33.5%66.5%
Jefferson CountyZone 2None76.2%23.8%
Switzerland CountyZone 2None100%None
Franklin CountyZone 2None63.0%37.0%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Ripley County, Local resources

Radon testing and mitigation in Ripley 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

Ripley County, Questions

Questions about radon in Ripley County

Are radon levels high in Ripley County?

Over the 2008 to 2017 laboratory totals, 35.3% of the radon tests reported to CDC for Ripley County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.9 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 51 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Ripley County?

Ripley County borders 7 counties: Dearborn County, Jennings County, Ohio County, Decatur County, Jefferson County, Switzerland County and Franklin County.

Products

Ripley County, Products

Testing a home in Ripley County

In Ripley County, 35.3% of 68 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 Ripley County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Ripley County homes, compared

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Ripley County, Bordering counties

Counties bordering Ripley County

Calculated by Radon411

Ripley County, Cities and towns

Cities and towns in Ripley County

The Census Bureau estimates 29,434 residents in Ripley County for July 1, 2025, 455 more than in 2020 (+1.6%). That works out to 66 people per square mile of land. Batesville, the largest place on its list (7,401 residents in all), extends beyond Ripley County, so no share of the total is worked out for it. Reported testing is thin here: 68 tests over 2008 to 2017, or 2.3 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From Batesville to Napoleon, CDC publishes no figure by town: each reads Ripley County's.

The cities and towns in Ripley County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Batesvilleextends beyond Ripley County7,401+2.7%Counted whole
Versailles2,203+1.4%7.5%
Milan1,838+1.0%6.2%
Osgood1,602+1.0%5.4%
Sunman925+2.3%3.1%
Holton430+3.1%1.5%
Napoleon241+1.3%0.8%

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 Ripley County is counted whole, so it has no share.

Ripley County, Homes

Homes in Ripley County

Ripley County is a place of houses on their own lots: 80% of its 12,398 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1977, close to Indiana's 1976: 35% date from before 1960 and 18% from 2000 or later. Owners live in 78% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in Ripley County, Indiana, 2019 to 2023
HomesRipley CountyIndiana
Housing units12,3982,953,344
Detached houses80%73%
In buildings of 5 or more6%13%
Mobile homes7%4%
Built before 196035%32%
Built since 200018%21%
Middle year built19771976
Owner-occupied78%70%

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