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Radon Levels in Geauga County, Ohio

EPA puts Geauga County in Zone 2, its middle radon zone, and 23.4% of its 1,469 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

    23.4%

    28.9 pts below OH

    Geauga
    23.4%
    Ohio
    52.3%

    1,469 tests, 2008 to 2017

  • Median result

    2.4pCi/L

    Below action level

    Geauga
    2.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,469

    18th of 79 by tests

    Geauga
    1,469
    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

    78 of 79

    Lowest quarter

    Geauga
    23.4%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Geauga County

Starts at Geauga County's median, 2.4 pCi/L

2.4pCi/L

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

EPA’s reading of 2.4 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. Geauga County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Geauga County, At a glance

Geauga County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Geauga 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 Geauga County, 2008 to 2017, laboratory

Reported results by concentration band, Geauga County, 2008 to 2017, laboratory
Under 2 pCi/L: 38%2 to 4 pCi/L: 39%4 pCi/L and above: 23%

Of 1,469 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Geauga County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L55237.6%
2 to 4 pCi/L57339.0%
4 pCi/L and above34423.4%
What these figures count

These are the 1,469 tests reported to CDC for Geauga 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

Geauga County, Compared

Geauga County radon figures, compared

Calculated by Radon411

Geauga County's 1,469 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.4 pCi/L and a maximum of 55.2 pCi/L, and 23.4% reached 4 pCi/L. Ohio as a whole (88 Ohio counties, pooled) comes to 52.3%: 28.9 points higher than here.

Among its state's counties it ranks 78th of 79 Ohio counties with 30 or more tests for the same period. Statewide for the same period, Pickaway County reported the highest share (81.4%) and Cuyahoga County the lowest (21.7%).

Below the action level, 552 tests (37.6%) came in under 2 pCi/L, against 23.1% statewide, and 573 tests (39.0%) fell between 2 and 4, against 24.6% statewide. CDC's ten-year totals for Geauga County went from 865 tests (2005 to 2014) to 1,469 (2008 to 2017), the share going from 25.8% to 23.4%.

EPA's 1993 zone map puts Geauga County in Zone 2, a predicted county average between 2 and 4 pCi/L. USGS geology rates 100% of the county's land moderate radon potential.

Next door, the shares run from 21.7% in Cuyahoga County to 39.3% in Portage County, with Cuyahoga County below Geauga County.

CDC also counts 61 tests taken after mitigation in Geauga County for the same period: tests in homes where a fix was already in.

Geauga County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Geauga County
Geauga County1,46923.4%2.4 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+28.9 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+12.3 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+58.0 points
Mahoning Countylowest in the state66623.4%2.5 pCi/LLevel
Portage County, OHborders it1,66139.3%3.2 pCi/L+15.9 points
Summit County, OHborders it6,48638.7%3.1 pCi/L+15.3 points
Trumbull County, OHborders it42534.6%2.9 pCi/L+11.2 points
Ashtabula County, OHborders it31434.4%2.5 pCi/L+11.0 points
Lake County, OHborders it2,34927.2%2.4 pCi/L+3.8 points
Cuyahoga County, OHborders it10,09221.7%2.0 pCi/L−1.7 points
Where Geauga County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultGeauga County testsGeauga County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L55237.6%23.1%39.6%+14.5 points
2 to 4 pCi/L57339.0%24.6%24.7%+14.4 points
4 pCi/L and above34423.4%52.3%35.7%−28.9 points
Geauga 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
Geauga County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20171,46923.4%2.4 pCi/L55.2 pCi/L52.3%−0.7 points
2007 to 20161,25724.1%2.4 pCi/L55.2 pCi/L52.8%−2.0 points
2006 to 20151,04926.1%2.5 pCi/L55.2 pCi/L52.9%+0.3 points
2005 to 201486525.8%2.5 pCi/L55.2 pCi/L52.4%First on file

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

Geauga County, Geology

The ground under Geauga County

Predicted

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

USGS's geologic areas under Geauga County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glaciated PlateauDevonian, Mississippian and Permian carbonates and shales.Moderate11100%

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

Geauga County beside the ground around it

Across Ohio 62.8% of the land is rated high; none of Geauga County's is. Of the 6 counties that border it, none has as large a share of moderate-potential ground; Portage County comes nearest at 100%.

Share of land by USGS radon potential: Geauga County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Geauga CountyZone 2None100%None
Lake CountyZone 2None99.7%None
Portage CountyZone 2None100%None
Cuyahoga CountyZone 2None99.9%None
Ashtabula CountyZone 2None99.9%None
Trumbull CountyZone 2None100%None
Summit CountyZone 1None100%None
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Geauga County, Local resources

Radon testing and mitigation in Geauga County

Listed radon businesses with an address in Geauga County:

Listed radon professionals by town: Chardon

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

Geauga County, Questions

Questions about radon in Geauga County

Are radon levels high in Geauga County?

Over the 2008 to 2017 laboratory totals, 23.4% of the radon tests reported to CDC for Geauga County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.4 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 77 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Geauga County?

Geauga County borders 6 counties: Lake County, Portage County, Cuyahoga County, Ashtabula County, Trumbull County and Summit County.

Products

Geauga County, Products

Testing a home in Geauga County

In Geauga County, 23.4% of 1,469 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 Geauga County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Geauga County homes, compared

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Geauga County, Bordering counties

Counties bordering Geauga County

Calculated by Radon411

Geauga County, Cities and towns

Cities and towns in Geauga County

Geauga County's population has barely moved since 2020: 95,676 residents on July 1, 2025 against 95,383 then, by the Census Bureau's estimates. That works out to 239 people per square mile of land. No town dominates: Chardon, the largest, has 5,251 residents, 5.5% of the total. Testing is reported here more often than across the state: CDC's 1,469 reported tests for 2008 to 2017 come to 15.4 for every 1,000 residents (2025 estimate), against 8.3 for Ohio.

From Chardon to Aquilla, CDC publishes no figure by town: each reads Geauga County's.

The cities and towns in Geauga County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Chardon5,251+0.2%5.5%
South Russell3,913−1.5%4.1%
Middlefield2,767+0.7%2.9%
Burton1,424+1.0%1.5%
Hunting Valleyextends beyond Geauga County764+2.6%Counted whole
Aquilla305−0.3%0.3%

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). A place that extends beyond Geauga County is counted whole, so it has no share.

Geauga County, Homes

Homes in Geauga County

Geauga County is a place of houses on their own lots: 87% of its 37,617 homes are detached single-family houses, against 69% across Ohio. Half of its homes were built before 1977, close to Ohio's 1970: 29% date from before 1960 and 16% from 2000 or later. Owners live in 87% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.

Homes in Geauga County, Ohio, 2019 to 2023
HomesGeauga CountyOhio
Housing units37,6175,271,573
Detached houses87%69%
In buildings of 5 or more4%15%
Mobile homes4%4%
Built before 196029%38%
Built since 200016%16%
Middle year built19771970
Owner-occupied87%67%

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