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Radon Levels in Ohio County, Indiana

EPA puts Ohio County in Zone 2, its middle radon zone, and only 21 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Highest bordering

    42.9%

    Boone County

    Boone
    42.9%
    Dearborn
    30.1%

    3 of 4 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    30.1%

    Dearborn County, 13 miles

    Dearborn
    30.1%
    Indiana
    38.9%

    Share at 4+ pCi/L, 136 tests, 2008 to 2017

  • Ground above low

    100.0%

    Level with Indiana

    Ohio
    100.0%
    Indiana
    100.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    21

    Too few for a share

    Ohio
    21
    Needed
    30

    2008 to 2017, laboratory

  • 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

Read a result for Ohio County

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Ohio County, At a glance

Ohio County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Ohio 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 Ohio County, 2008 to 2017, laboratory

CDC holds 21 reported tests for Ohio County over the 2008 to 2017 laboratory totals, with a median of 4.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Ohio County beside the counties around it is how this page reads it.

What these figures count

Only 21 tests were reported to CDC for Ohio County over 2008 to 2017 (laboratory totals), 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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Ohio County, Compared

Ohio County radon figures, compared

Calculated by Radon411

CDC's largest figure for Ohio County rests on 21 tests over the 2008 to 2017 laboratory totals, 11 of them at or above 4 pCi/L, so each test moves its share by 4.8 points and no rank or comparison is drawn from it. Results reached as high as 10.0 pCi/L, with a middle value of 4.1 pCi/L.

Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Boone County, KY reported the largest share at or above 4 pCi/L, 42.9%, and Dearborn County the smallest, 30.1%, with Ripley County at 35.3% between. Farther out, Jefferson County (28 miles away) at 45.8%, Franklin County (32 miles away) at 28.0% and Jennings County (36 miles away) at 35.1% have figures too. Pooled across 92 Indiana counties, 38.9% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%). EPA's 1993 map puts Ohio County in Zone 2, its middle label: a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Indiana, the United States and the counties around Ohio County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
Indiana, pooled92 counties, pooled43,14838.9%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Miami Countyhighest in the state3063.3%5.3 pCi/L
Jasper Countylowest in the state7114.1%1.2 pCi/L
Boone County, KYborders it1,43442.9%3.5 pCi/L
Ripley County, INborders it6835.3%2.9 pCi/L
Switzerland County, INborders it1533.3%1.5 pCi/L
Dearborn County, INborders it13630.1%2.6 pCi/L
The nearest Indiana counties to Ohio County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Dearborn County13 mi13630.1%2.6 pCi/L
Ripley County19 mi6835.3%2.9 pCi/L
Jefferson County28 mi7245.8%3.1 pCi/L
Franklin County32 mi5028.0%2.1 pCi/L
Jennings County36 mi5735.1%2.8 pCi/L
Decatur County38 mi6333.3%2.8 pCi/L
Clark County52 mi51247.7%3.6 pCi/L
Bartholomew County53 mi1,70748.7%3.9 pCi/L
Ohio County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 20172152.4%4.1 pCi/L10.0 pCi/L38.9%−0.2 points
2007 to 20161952.6%4.3 pCi/L10.0 pCi/L39.2%+2.6 points
2006 to 20151850.0%4.5 pCi/L10.0 pCi/L39.6%+6.2 points
2005 to 20141643.8%3.0 pCi/L8.6 pCi/L39.3%First on file

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

Ohio County, Geology

The ground under Ohio County

Predicted

USGS's geologic map puts all of Ohio 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 Ohio County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Dearborn UplandOrdovician through Devonian limestone, dolostone, and gray shale, and pre-Wisconsinan glacial deposits.Moderate1099.7%

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

Ohio County beside the ground around it

Across Indiana 56.6% of the land is rated high; none of Ohio County's is. Of the 4 counties that border it, none has as large a share of moderate-potential ground; Ripley County comes nearest at 100%.

Share of land by USGS radon potential: Ohio County, the 4 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Ohio CountyZone 2None100%None
Boone County, KYZone 2None100%None
Switzerland CountyZone 2None100%None
Dearborn CountyZone 2None100%None
Ripley 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

Ohio County, Local resources

Radon testing and mitigation in Ohio 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

Ohio County, Questions

Questions about radon in Ohio County

Are radon levels high in Ohio County?

Over the 2008 to 2017 laboratory totals, 52.4% of the radon tests reported to CDC for Ohio County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.1 pCi/L. Of the counties bordering it, 3 have a figure over the 2008 to 2017 laboratory totals: Boone County, KY reported the largest share at or above 4 pCi/L, 42.9%, and Dearborn County the smallest, 30.1%, with Ripley County at 35.3% between.

Which counties border Ohio County?

Ohio County borders 4 counties: Boone County, KY, Switzerland County, IN, Dearborn County, IN and Ripley County, IN.

Products

Ohio County, Products

Testing a home in Ohio County

No CDC figure names Ohio County; the nearest county with one, Dearborn County (13 miles away), reported 30.1% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Ohio County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Ohio County homes, compared

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Ohio County, Bordering counties

Counties bordering Ohio County

Calculated by Radon411

Ohio County, Cities and towns

Cities and towns in Ohio County

The Census Bureau estimates 5,994 residents in Ohio County for July 1, 2025, 68 more than in 2020 (+1.1%). That works out to 70 people per square mile of land. Rising Sun, its one incorporated place, has 2,222 residents, 37.1% of the total. Reported testing is thin here: 21 tests over 2008 to 2017, or 3.5 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

Rising Sun is the one incorporated place here; CDC publishes no figure by town, so it reads Ohio County's.

Rising Sun, Ohio County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Rising Sun2,222−0.1%37.1%

One incorporated place, 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).

Ohio County, Homes

Homes in Ohio County

Ohio County is a place of houses on their own lots: 77% of its 2,755 homes are detached single-family houses, against 73% across Indiana. Half of its homes were built before 1977, close to Indiana's 1976: 34% date from before 1960 and 21% from 2000 or later. Owners live in 77% of the occupied homes (Indiana: 70%), so for most households a test and a fix are their own to order.

Homes in Ohio County, Indiana, 2019 to 2023
HomesOhio CountyIndiana
Housing units2,7552,953,344
Detached houses77%73%
In buildings of 5 or more5%13%
Mobile homes11%4%
Built before 196034%32%
Built since 200021%21%
Middle year built19771976
Owner-occupied77%70%

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