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Radon Levels in Noble County, Ohio

EPA puts Noble County in Zone 2, its middle radon zone, and 31.0% of its 42 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

    31.0%

    21.3 pts below OH

    Noble
    31.0%
    Ohio
    52.3%

    42 tests, 2008 to 2017

  • Median result

    2.2pCi/L

    Below action level

    Noble
    2.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    42

    78th of 79 by tests

    Noble
    42
    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

    74 of 79

    Lowest quarter

    Noble
    31.0%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Noble County

Starts at Noble County's median, 2.2 pCi/L

2.2pCi/L

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

EPA’s reading of 2.2 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. Noble County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Noble County, At a glance

Noble County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Noble 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 Noble County, 2008 to 2017, laboratory

Reported results by concentration band, Noble County, 2008 to 2017, laboratory
Under 2 pCi/L: 40%2 to 4 pCi/L: 29%4 pCi/L and above: 31%

Of 42 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Noble County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1740.5%
2 to 4 pCi/L1228.6%
4 pCi/L and above1331.0%
What these figures count

These are the 42 tests reported to CDC for Noble 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

Noble County, Compared

Noble County radon figures, compared

Calculated by Radon411

In Noble County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (13 of 42) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.7 points lower. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Noble County runs 21.3 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 38.1% (Washington County) to 58.3% (Monroe County). By share, Noble County is 74th of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 2.2 pCi/L and half over it; the single highest reached 15.2 pCi/L. Below the action level, 17 tests (40.5%) came in under 2 pCi/L, against 23.1% statewide, and 12 tests (28.6%) 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 31.0% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential.

CDC's ten-year totals for Noble County went from 38 tests (2005 to 2014) to 42 (2008 to 2017), the share going from 31.6% to 31.0%.

Noble County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Noble County
Noble County4231.0%2.2 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+21.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+4.7 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+50.4 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−9.3 points
Monroe County, OHborders it4858.3%5.0 pCi/L+27.3 points
Muskingum County, OHborders it39156.3%4.9 pCi/L+25.3 points
Belmont County, OHborders it69745.2%3.6 pCi/L+14.2 points
Guernsey County, OHborders it11744.4%3.6 pCi/L+13.4 points
Washington County, OHborders it34938.1%3.1 pCi/L+7.1 points
Morgan County, OHborders it1030.0%3.3 pCi/L−1.0 points
Where Noble County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultNoble County testsNoble County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L1740.5%23.1%39.6%+17.4 points
2 to 4 pCi/L1228.6%24.6%24.7%+4.0 points
4 pCi/L and above1331.0%52.3%35.7%−21.3 points
Noble 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
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
Lake County76 of 792,34927.2%2.4 pCi/L
Mahoning County77 of 7966623.4%2.5 pCi/L
Geauga County78 of 791,46923.4%2.4 pCi/L
Cuyahoga County79 of 7910,09221.7%2.0 pCi/L
Noble County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20174231.0%2.2 pCi/L15.2 pCi/L52.3%−0.7 points
2007 to 20164131.7%2.1 pCi/L15.2 pCi/L52.8%+0.1 points
2006 to 20153831.6%2.1 pCi/L15.2 pCi/L52.9%Level
2005 to 20143831.6%2.1 pCi/L15.2 pCi/L52.4%First on file

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

Noble County, Geology

The ground under Noble County

Predicted

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

USGS's geologic areas under Noble County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Unglaciated PlateauMississippian through Permian limestone, dolomite, and shale.Moderate11100%

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

Noble County beside the ground around it

Across Ohio 62.8% of the land is rated high; none of Noble County's is. Of the 6 counties that border it, 3 have more high-potential ground, Guernsey County the most at 85.7%.

Share of land by USGS radon potential: Noble County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Noble CountyZone 2None100%None
Guernsey CountyZone 1None14.3%85.7%
Morgan CountyZone 2None100%None
Monroe CountyZone 2None100%None
Washington CountyZone 2None100%None
Muskingum CountyZone 1None28.5%71.5%
Belmont CountyZone 1None30.9%69.1%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Noble County, Local resources

Radon testing and mitigation in Noble County

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

Noble County, Questions

Questions about radon in Noble County

Are radon levels high in Noble County?

Over the 2008 to 2017 laboratory totals, 31.0% of the radon tests reported to CDC for Noble County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 73 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Noble County?

Noble County borders 6 counties: Guernsey County, Morgan County, Monroe County, Washington County, Muskingum County and Belmont County.

Products

Noble County, Products

Testing a home in Noble County

In Noble County, 31.0% of 42 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 Noble County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Noble County homes, compared

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Noble County, Bordering counties

Counties bordering Noble County

Calculated by Radon411

Noble County, Cities and towns

Cities and towns in Noble County

The Census Bureau estimates 14,276 residents in Noble County for July 1, 2025, 178 more than in 2020 (+1.3%). That works out to 36 people per square mile of land. No town dominates: Caldwell, the largest, has 1,866 residents, 13.1% of the total. Together its 6 incorporated places hold 18.5% of those residents; the other 81.5% live outside any of them. Reported testing is thin here: 42 tests over 2008 to 2017, or 2.9 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Caldwell to Dexter City, CDC publishes no figure by town: each reads Noble County's.

The cities and towns in Noble County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Caldwell1,866+11.4%13.1%
Summerfield240−0.4%1.7%
Belle Valley199−1.0%1.4%
Sarahsville146Level1.0%
Batesville102+1.0%0.7%
Dexter City81−1.2%0.6%

6 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).

Noble County, Homes

Homes in Noble County

Of Noble County's 5,797 homes, 74% are detached houses, against 69% across Ohio; 18% are mobile homes. Much of Noble County is recent building: 22% of its homes have gone up since 2000 and the middle year built is 1979, against 1970 for Ohio. Owners live in 82% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.

Homes in Noble County, Ohio, 2019 to 2023
HomesNoble CountyOhio
Housing units5,7975,271,573
Detached houses74%69%
In buildings of 5 or more4%15%
Mobile homes18%4%
Built before 196027%38%
Built since 200022%16%
Middle year built19791970
Owner-occupied82%67%

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