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Radon Levels in Wood County, Ohio

EPA puts Wood County in Zone 2, its middle radon zone, and high results are common there: 45.5% of the 1,192 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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

    45.5%

    6.8 pts below OH

    Wood
    45.5%
    Ohio
    52.3%

    1,192 tests, 2008 to 2017

  • Median result

    3.5pCi/L

    Below action level

    Wood
    3.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,192

    25th of 79 by tests

    Wood
    1,192
    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

    56 of 79

    Middle half

    Wood
    45.5%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Wood County

Starts at Wood County's median, 3.5 pCi/L

3.5pCi/L

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

EPA’s reading of 3.5 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. Wood County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Wood County, At a glance

Wood County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Wood 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 92% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Wood County, 2008 to 2017, laboratory
Under 2 pCi/L: 30%2 to 4 pCi/L: 25%4 pCi/L and above: 45%

Of 1,192 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Wood County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L35229.5%
2 to 4 pCi/L29825.0%
4 pCi/L and above54245.5%
What these figures count

These are the 1,192 tests reported to CDC for Wood 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

Wood County, Compared

Wood County radon figures, compared

Calculated by Radon411

In Wood County, about 5 in 10 reported tests over the 2008 to 2017 laboratory totals (542 of 1,192) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 9.8 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Wood County runs 6.8 points below its state.

Of 7 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 2 a smaller one; the spread is 40.2% (Lucas County) to 61.8% (Henry County). By share, Wood County is 56th of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 3.5 pCi/L and half over it; the single highest reached 58.8 pCi/L. Below the action level, 352 tests (29.5%) came in under 2 pCi/L, against 23.1% statewide, and 298 tests (25.0%) 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 45.5% share point the same way here. USGS geology rates 92% of the county's land high radon potential. CDC also counts 663 tests taken after mitigation in Wood County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Wood County went from 1,041 tests (2005 to 2014) to 1,192 (2008 to 2017), the share going from 40.9% to 45.5%.

Wood County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Wood County
Wood County1,19245.5%3.5 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+6.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−9.8 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+35.9 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−23.8 points
Henry County, OHborders it3461.8%5.3 pCi/L+16.3 points
Putnam County, OHborders it9459.6%4.8 pCi/L+14.1 points
Sandusky County, OHborders it64959.2%5.0 pCi/L+13.7 points
Seneca County, OHborders it54058.9%4.9 pCi/L+13.4 points
Hancock County, OHborders it1,38246.2%3.7 pCi/L+0.7 points
Ottawa County, OHborders it54140.3%2.9 pCi/L−5.2 points
Lucas County, OHborders it1,38140.2%3.0 pCi/L−5.3 points
Where Wood County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultWood County testsWood County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L35229.5%23.1%39.6%+6.4 points
2 to 4 pCi/L29825.0%24.6%24.7%+0.4 points
4 pCi/L and above54245.5%52.3%35.7%−6.8 points
Wood 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
Perry County51 of 799048.9%3.8 pCi/L
Defiance County52 of 797048.6%3.8 pCi/L
Brown County53 of 797047.1%3.3 pCi/L
Wyandot County54 of 7932046.3%3.6 pCi/L
Hancock County55 of 791,38246.2%3.7 pCi/L
Wood County56 of 791,19245.5%3.5 pCi/L
Lorain County57 of 793,30745.4%3.6 pCi/L
Belmont County58 of 7969745.2%3.6 pCi/L
Fulton County59 of 796245.2%3.1 pCi/L
Guernsey County60 of 7911744.4%3.6 pCi/L
Medina County61 of 792,13943.4%3.5 pCi/L
Wood County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20171,19245.5%3.5 pCi/L58.8 pCi/L52.3%+0.7 points
2007 to 20161,11544.8%3.4 pCi/L58.8 pCi/L52.8%+2.7 points
2006 to 20151,12942.1%3.1 pCi/L58.8 pCi/L52.9%+1.2 points
2005 to 20141,04140.9%2.9 pCi/L62.5 pCi/L52.4%First on file

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

Wood County, Geology

The ground under Wood County

Predicted

Most of the ground under Wood County is one class on USGS's geologic map: 91.7% of its land is high radon potential, with 8.3% moderate. The map puts 91.7% of Wood County in the area it calls Till Plains and 8.3% in Lake Plains. USGS gives the first a radon index of 14, in the high band (12 to 17), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Wood County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Till PlainsGlacial deposits underlain by Ordovician through Devonian limestone and shale.High1491.7%
Lake PlainsGlacial lake deposits, Devonian shale and limestone.Moderate108.3%

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

Wood County beside the ground around it

Wood County has more high-potential ground than Ohio as a whole: 91.7% of its land against 62.8%. Of the 7 counties that border it, 2 have more high-potential ground, Hancock County the most at 100%.

Share of land by USGS radon potential: Wood County, the 7 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Wood CountyZone 2None8.3%91.7%
Hancock CountyZone 1NoneNone100%
Lucas CountyZone 2None85.6%13.9%
Henry CountyZone 2None25.7%74.3%
Ottawa CountyZone 2None84.2%12.1%
Sandusky CountyZone 2None53.0%46.5%
Putnam CountyZone 2None32.3%67.7%
Seneca CountyZone 1None0.6%99.4%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Wood County, Local resources

Radon testing and mitigation in Wood County

Listed radon businesses with an address in Wood County:

Listed radon professionals by town: Bowling Green, Perrysburg, Fostoria

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

Wood County, Questions

Questions about radon in Wood County

Are radon levels high in Wood County?

Over the 2008 to 2017 laboratory totals, 45.5% of the radon tests reported to CDC for Wood County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.5 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 55 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Wood County?

Wood County borders 7 counties: Hancock County, Lucas County, Henry County, Ottawa County, Sandusky County, Putnam County and Seneca County.

Products

Wood County, Products

Testing a home in Wood County

In Wood County, 45.5% of 1,192 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 Wood County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Wood County homes, compared

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Wood County, Bordering counties

Counties bordering Wood County

Calculated by Radon411

Wood County, Cities and towns

Cities and towns in Wood County

The Census Bureau estimates 134,176 residents in Wood County for July 1, 2025, 1,930 more than in 2020 (+1.5%). That works out to 217 people per square mile of land. Its largest town, Bowling Green, has 31,182 residents, 23.2% of the total. CDC's 1,192 reported tests for 2008 to 2017 work out to 8.9 per 1,000 residents (2025 estimate), close to Ohio's 8.3.

From Bowling Green to Bairdstown, CDC publishes no figure by town: each reads Wood County's.

The 12 largest cities and towns in Wood County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Bowling Green31,182+1.3%23.2%
Perrysburg25,441+1.5%19.0%
Fostoriaextends beyond Wood County12,920−1.0%Counted whole
Rossford6,369+1.2%4.7%
Northwood5,252+1.5%3.9%
North Baltimore3,409+1.3%2.5%
Walbridge3,076+2.1%2.3%
Weston1,486+2.0%1.1%
Pemberville1,334+0.9%1.0%
Haskins1,263+1.5%0.9%
Millbury1,211+1.5%0.9%
Luckey1,017+1.0%0.8%
  • Bradner
  • Grand Rapids
  • Wayne
  • Bloomdale
  • Cygnet
  • Risingsun
  • Jerry City
  • Portage
  • Tontogany
  • Hoytville
  • Custar
  • Milton Center
  • West Millgrove
  • Bairdstown

26 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 Wood County is counted whole, so it has no share.

Wood County, Homes

Homes in Wood County

Of Wood County's 57,282 homes, 63% are detached houses, against 69% across Ohio; 19% are in buildings of five or more homes. Much of Wood County is recent building: 21% of its homes have gone up since 2000 and the middle year built is 1978, against 1970 for Ohio. 65% 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 Wood County, Ohio, 2019 to 2023
HomesWood CountyOhio
Housing units57,2825,271,573
Detached houses63%69%
In buildings of 5 or more19%15%
Mobile homes6%4%
Built before 196027%38%
Built since 200021%16%
Middle year built19781970
Owner-occupied65%67%

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