Skip to content
RADON411

Locations and reports

Radon Levels in Summit County, Ohio

EPA puts Summit County in Zone 1, its highest radon zone, and 38.7% of its 6,486 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

    38.7%

    13.6 pts below OH

    Summit
    38.7%
    Ohio
    52.3%

    6,486 tests, 2008 to 2017

  • Median result

    3.1pCi/L

    Below action level

    Summit
    3.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    6,486

    3rd of 79 by tests

    Summit
    6,486
    Franklin
    16,142

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Ohio

    67 of 79

    Lowest quarter

    Summit
    38.7%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Summit County

Starts at Summit County's median, 3.1 pCi/L

3.1pCi/L

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

EPA’s reading of 3.1 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. Summit County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Summit County, At a glance

Summit County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Summit County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

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 Summit County, 2008 to 2017, laboratory

Reported results by concentration band, Summit County, 2008 to 2017, laboratory
Under 2 pCi/L: 29%2 to 4 pCi/L: 32%4 pCi/L and above: 39%

Of 6,486 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Summit County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1,91929.6%
2 to 4 pCi/L2,06031.8%
4 pCi/L and above2,50738.7%
What these figures count

These are the 6,486 tests reported to CDC for Summit 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

Summit County, Compared

Summit County radon figures, compared

Calculated by Radon411

In Summit County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (2,507 of 6,486) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 3.0 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Summit County runs 13.6 points below its state.

Of 6 neighbours with a figure, 4 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 21.7% (Cuyahoga County) to 61.8% (Wayne County). By share, Summit County is 67th of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 3.1 pCi/L and half over it; the single highest reached 194.7 pCi/L. Below the action level, 1,919 tests (29.6%) came in under 2 pCi/L, against 23.1% statewide, and 2,060 tests (31.8%) fell between 2 and 4, against 24.6% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 38.7% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 600 tests taken after mitigation in Summit County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Summit County went from 4,439 tests (2005 to 2014) to 6,486 (2008 to 2017), the share going from 39.7% to 38.7%.

Summit County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Summit County
Summit County6,48638.7%3.1 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+13.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−3.0 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+42.7 points
Mahoning Countylowest in the state66623.4%2.5 pCi/L−15.3 points
Wayne County, OHborders it1,07461.8%4.9 pCi/L+23.1 points
Stark County, OHborders it3,31760.1%4.9 pCi/L+21.4 points
Medina County, OHborders it2,13943.4%3.5 pCi/L+4.7 points
Portage County, OHborders it1,66139.3%3.2 pCi/L+0.6 points
Geauga County, OHborders it1,46923.4%2.4 pCi/L−15.3 points
Cuyahoga County, OHborders it10,09221.7%2.0 pCi/L−17.0 points
Where Summit County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultSummit County testsSummit County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L1,91929.6%23.1%39.6%+6.5 points
2 to 4 pCi/L2,06031.8%24.6%24.7%+7.2 points
4 pCi/L and above2,50738.7%52.3%35.7%−13.6 points
Summit 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
Hardin County62 of 796743.3%3.4 pCi/L
Jackson County63 of 794841.7%3.3 pCi/L
Ottawa County64 of 7954140.3%2.9 pCi/L
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
Summit County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20176,48638.7%3.1 pCi/L194.7 pCi/L52.3%−0.6 points
2007 to 20165,92239.3%3.1 pCi/L194.7 pCi/L52.8%−0.8 points
2006 to 20155,14040.1%3.2 pCi/L144.1 pCi/L52.9%+0.4 points
2005 to 20144,43939.7%3.1 pCi/L164.6 pCi/L52.4%First on file

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

Summit County, Geology

The ground under Summit County

Predicted

USGS's geologic map puts all of Summit County's mapped land in one class: moderate radon potential. 97.1% 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 Summit County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glaciated PlateauDevonian, Mississippian and Permian carbonates and shales.Moderate1197.1%
Lake PlainsGlacial lake deposits, Devonian shale and limestone.Moderate102.9%

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

Summit County beside the ground around it

Across Ohio 62.8% of the land is rated high; none of Summit County's is. Of the 6 counties that border it, 2 have more high-potential ground, Wayne County the most at 65.4%.

Share of land by USGS radon potential: Summit County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Summit CountyZone 1None100%None
Portage CountyZone 2None100%None
Medina CountyZone 2None100%None
Cuyahoga CountyZone 2None99.9%None
Stark CountyZone 1None56.2%43.8%
Wayne CountyZone 1None34.6%65.4%
Geauga CountyZone 2None100%None
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Summit County, Local resources

Radon testing and mitigation in Summit County

Listed radon businesses with an address in Summit County:

Listed radon professionals by town: Akron, Cuyahoga Falls, Stow, Barberton, Hudson, Twinsburg, Tallmadge, New Franklin, Norton, Fairlawn, Munroe Falls, Northfield, Clinton, Peninsula

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

Summit County, Questions

Questions about radon in Summit County

Are radon levels high in Summit County?

Over the 2008 to 2017 laboratory totals, 38.7% of the radon tests reported to CDC for Summit County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.1 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 66 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Summit County?

Summit County borders 6 counties: Portage County, Medina County, Cuyahoga County, Stark County, Wayne County and Geauga County.

Products

Summit County, Products

Testing a home in Summit County

In Summit County, 38.7% of 6,486 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 1 the year-round level in Summit County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Summit County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Summit County

Explore

Summit County, Bordering counties

Counties bordering Summit County

Calculated by Radon411

Summit County, Cities and towns

Cities and towns in Summit County

Summit County's population has barely moved since 2020: 538,376 residents on July 1, 2025 against 539,833 then, by the Census Bureau's estimates. Packed into its land, that is 1,304 people per square mile. Its largest town, Akron, has 189,691 residents, 35.2% of the total. CDC's 6,486 reported tests for 2008 to 2017 work out to 12.0 per 1,000 residents (2025 estimate), close to Ohio's 8.3.

From Akron to Peninsula, CDC publishes no figure by town: each reads Summit County's.

The 12 largest cities and towns in Summit County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Akron189,691−0.3%35.2%
Cuyahoga Falls50,975−0.1%9.5%
Stow33,941−1.5%6.3%
Green27,553+0.4%5.1%
Barberton24,748−1.5%4.6%
Hudson23,085+0.1%4.3%
Twinsburg18,939−1.6%3.5%
Tallmadgeextends beyond Summit County18,521+0.7%Counted whole
New Franklin13,873+0.1%2.6%
Macedonia12,147−0.2%2.3%
Nortonextends beyond Summit County11,493−1.4%Counted whole
Fairlawn7,815+1.4%1.5%
  • Reminderville
  • Munroe Falls
  • Mogadore (part)
  • Richfield
  • Northfield
  • Lakemore
  • Silver Lake
  • Boston Heights
  • Clinton
  • Peninsula

22 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Summit County is counted whole, so it has no share.

Summit County, Homes

Homes in Summit County

Of Summit County's 247,239 homes, 72% are detached houses, against 69% across Ohio; 15% are in buildings of five or more homes. Half of its homes were built before 1965, close to Ohio's 1970: 44% date from before 1960 and 12% from 2000 or later. 67% 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 Summit County, Ohio, 2019 to 2023
HomesSummit CountyOhio
Housing units247,2395,271,573
Detached houses72%69%
In buildings of 5 or more15%15%
Mobile homes1%4%
Built before 196044%38%
Built since 200012%16%
Middle year built19651970
Owner-occupied67%67%

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