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Radon Levels in Scioto County, Ohio

EPA puts Scioto County in Zone 2, its middle radon zone, and 37.0% of its 73 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    37.0%

    15.3 pts below OH

    Scioto
    37.0%
    Ohio
    52.3%

    73 tests, 2008 to 2017

  • Median result

    2.7pCi/L

    Below action level

    Scioto
    2.7 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    73

    65th of 79 by tests

    Scioto
    73
    Franklin
    16,142

    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 Ohio

    70 of 79

    Lowest quarter

    Scioto
    37.0%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Scioto County

Starts at Scioto County's median, 2.7 pCi/L

2.7pCi/L

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

EPA’s reading of 2.7 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. Scioto County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Scioto County, At a glance

Scioto County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Scioto 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: High across 79% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Scioto County, 2008 to 2017, laboratory
Under 2 pCi/L: 32%2 to 4 pCi/L: 31%4 pCi/L and above: 37%

Of 73 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Scioto County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L2331.5%
2 to 4 pCi/L2331.5%
4 pCi/L and above2737.0%
What these figures count

These are the 73 tests reported to CDC for Scioto 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

Scioto County, Compared

Scioto County radon figures, compared

Calculated by Radon411

In Scioto County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (27 of 73) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.3 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Scioto County runs 15.3 points below its state.

Of 4 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 12.5% (Greenup County, KY) to 56.1% (Pike County). By share, Scioto County is 70th of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 2.7 pCi/L and half over it; the single highest reached 26.0 pCi/L. Below the action level, 23 tests (31.5%) came in under 2 pCi/L, against 23.1% statewide, and 23 tests (31.5%) fell between 2 and 4, against 24.6% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 37.0% share point the same way here. USGS geology rates 79% of the county's land high radon potential. CDC also counts 16 tests taken after mitigation in Scioto County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Scioto County went from 86 tests (2005 to 2014) to 73 (2008 to 2017), the share going from 30.2% to 37.0%.

Scioto County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Scioto County
Scioto County7337.0%2.7 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+15.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−1.3 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+44.4 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−15.3 points
Pike County, OHborders it5756.1%4.5 pCi/L+19.1 points
Adams County, OHborders it1850.0%3.8 pCi/L+13.0 points
Jackson County, OHborders it4841.7%3.3 pCi/L+4.7 points
Lewis County, KYborders it1233.3%2.8 pCi/L−3.7 points
Lawrence County, OHborders it6630.3%2.5 pCi/L−6.7 points
Greenup County, KYborders it10412.5%2.0 pCi/L−24.5 points
Where Scioto County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultScioto County testsScioto County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L2331.5%23.1%39.6%+8.4 points
2 to 4 pCi/L2331.5%24.6%24.7%+6.9 points
4 pCi/L and above2737.0%52.3%35.7%−15.3 points
Scioto County ranked among the 79 Ohio counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Lucas County65 of 791,38140.2%3.0 pCi/L
Portage County66 of 791,66139.3%3.2 pCi/L
Summit County67 of 796,48638.7%3.1 pCi/L
Washington County68 of 7934938.1%3.1 pCi/L
Athens County69 of 7931838.1%3.1 pCi/L
Scioto County70 of 797337.0%2.7 pCi/L
Hamilton County71 of 793,75434.7%2.8 pCi/L
Trumbull County72 of 7942534.6%2.9 pCi/L
Ashtabula County73 of 7931434.4%2.5 pCi/L
Noble County74 of 794231.0%2.2 pCi/L
Lawrence County75 of 796630.3%2.5 pCi/L
Scioto County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20177337.0%2.7 pCi/L26.0 pCi/L52.3%+4.0 points
2007 to 20168833.0%2.7 pCi/L26.0 pCi/L52.8%+1.8 points
2006 to 20159331.2%2.7 pCi/L26.0 pCi/L52.9%+1.0 points
2005 to 20148630.2%2.7 pCi/L26.0 pCi/L52.4%First on file

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

Scioto County, Geology

The ground under Scioto County

Predicted

Most of the ground under Scioto County is one class on USGS's geologic map: 79.3% of its land is high radon potential, with 20.7% moderate. The map puts 71.1% of Scioto County in the area it calls Mississippian Limestone and 20.6% in Unglaciated Plateau, with one smaller area beside them. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Scioto County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Mississippian LimestoneMississippian limestone exhibiting high gamma radioactivity.High1471.1%
Unglaciated PlateauMississippian through Permian limestone, dolomite, and shale.Moderate1120.6%
Ohio ShaleDevonian-Mississippian black shale (includes some Ordovician limestone)High148.2%

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

Scioto County beside the ground around it

Scioto County has more high-potential ground than Ohio as a whole: 79.3% of its land against 62.8%. Of the 6 counties that border it, 1 has more high-potential ground, Pike County the most at 98.5%.

Share of land by USGS radon potential: Scioto County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Scioto CountyZone 2None20.7%79.3%
Greenup County, KYZone 2None99.5%0.5%
Pike CountyZone 1None1.5%98.5%
Jackson CountyZone 2None88.9%11.1%
Lawrence CountyZone 2None99.9%0.1%
Adams CountyZone 1None41.7%58.3%
Lewis County, KYZone 2None59.2%40.8%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Scioto County, Local resources

Radon testing and mitigation in Scioto County

Listed radon businesses with an address in Scioto County:

Listed radon professionals by town: South Webster

What Ohio's program says
Phone
614-728-0272
Email
indoor.radon@odh.ohio.gov
Licensing of radon professionals
This program licenses companies and persons directly involved with the radon testing and mitigation industry.

What it means

Scioto County, Questions

Questions about radon in Scioto County

Are radon levels high in Scioto County?

Over the 2008 to 2017 laboratory totals, 37.0% of the radon tests reported to CDC for Scioto County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.7 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 69 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Scioto County?

Scioto County borders 6 counties: Greenup County, KY, Pike County, OH, Jackson County, OH, Lawrence County, OH, Adams County, OH and Lewis County, KY.

Products

Scioto County, Products

Testing a home in Scioto County

In Scioto County, 37.0% of 73 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Scioto County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Scioto County homes, compared

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Scioto County, Bordering counties

Counties bordering Scioto County

Calculated by Radon411

Scioto County, Cities and towns

Cities and towns in Scioto County

About 71,365 people live in Scioto County by the Census Bureau's estimate for July 1, 2025, 2,484 fewer than in 2020 (−3.4%). That works out to 117 people per square mile of land. Its largest town, Portsmouth, has 17,282 residents, 24.2% of the total. Together its 5 incorporated places hold 28.5% of those residents; the other 71.5% live outside any of them. Reported testing is thin here: 73 tests over 2008 to 2017, or 1.0 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Portsmouth to Otway, CDC publishes no figure by town: each reads Scioto County's.

The cities and towns in Scioto County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Portsmouth17,282−5.0%24.2%
New Boston2,206−3.9%3.1%
South Webster635−2.8%0.9%
Rarden138−3.5%0.2%
Otway88−5.4%0.1%

5 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).

Scioto County, Homes

Homes in Scioto County

Of Scioto County's 33,153 homes, 73% are detached houses, against 69% across Ohio; 14% are mobile homes. Half of its homes were built before 1968, close to Ohio's 1970: 41% date from before 1960 and 12% from 2000 or later. 69% of occupied homes are lived in by their owner (Ohio: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Scioto County, Ohio, 2019 to 2023
HomesScioto CountyOhio
Housing units33,1535,271,573
Detached houses73%69%
In buildings of 5 or more7%15%
Mobile homes14%4%
Built before 196041%38%
Built since 200012%16%
Middle year built19681970
Owner-occupied69%67%

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