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Radon Levels in Lucas County, Ohio

EPA puts Lucas County in Zone 2, its middle radon zone, and high results are common there: 40.2% of the 1,381 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

    40.2%

    12.1 pts below OH

    Lucas
    40.2%
    Ohio
    52.3%

    1,381 tests, 2008 to 2017

  • Median result

    3.0pCi/L

    Below action level

    Lucas
    3.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,381

    21st of 79 by tests

    Lucas
    1,381
    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

    65 of 79

    Lowest quarter

    Lucas
    40.2%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Lucas County

Starts at Lucas County's median, 3.0 pCi/L

3.0pCi/L

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

EPA’s reading of 3.0 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. Lucas County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Lucas County, At a glance

Lucas County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Lucas 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 86% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Lucas County, 2008 to 2017, laboratory
Under 2 pCi/L: 36%2 to 4 pCi/L: 24%4 pCi/L and above: 40%

Of 1,381 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Lucas County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L50036.2%
2 to 4 pCi/L32623.6%
4 pCi/L and above55540.2%
What these figures count

These are the 1,381 tests reported to CDC for Lucas 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

Lucas County, Compared

Lucas County radon figures, compared

Calculated by Radon411

In Lucas County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (555 of 1,381) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 4.5 points higher. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Lucas County runs 12.1 points below its state.

Of 6 neighbours with a figure, 5 reported a larger share at or above 4 pCi/L and 1 a smaller one; the spread is 30.4% (Monroe County, MI) to 61.8% (Henry County). By share, Lucas County is 65th of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 3.0 pCi/L and half over it; the single highest reached 90.9 pCi/L. Below the action level, 500 tests (36.2%) came in under 2 pCi/L, against 23.1% statewide, and 326 tests (23.6%) 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 40.2% share point the same way here. USGS geology rates 86% of the county's land moderate radon potential. CDC also counts 911 tests taken after mitigation in Lucas County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Lucas County went from 1,254 tests (2005 to 2014) to 1,381 (2008 to 2017), the share going from 33.9% to 40.2%.

Lucas County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Lucas County
Lucas County1,38140.2%3.0 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+12.1 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−4.5 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+41.2 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−18.5 points
Henry County, OHborders it3461.8%5.3 pCi/L+21.6 points
Lenawee County, MIborders it1,90756.7%4.6 pCi/L+16.5 points
Wood County, OHborders it1,19245.5%3.5 pCi/L+5.3 points
Fulton County, OHborders it6245.2%3.1 pCi/L+5.0 points
Ottawa County, OHborders it54140.3%2.9 pCi/L+0.1 points
Monroe County, MIborders it1,37530.4%2.5 pCi/L−9.8 points
Where Lucas County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultLucas County testsLucas County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L50036.2%23.1%39.6%+13.1 points
2 to 4 pCi/L32623.6%24.6%24.7%−1.0 points
4 pCi/L and above55540.2%52.3%35.7%−12.1 points
Lucas 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
Guernsey County60 of 7911744.4%3.6 pCi/L
Medina County61 of 792,13943.4%3.5 pCi/L
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
Lucas County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20171,38140.2%3.0 pCi/L90.9 pCi/L52.3%+0.6 points
2007 to 20161,32839.6%2.9 pCi/L90.9 pCi/L52.8%+3.5 points
2006 to 20151,31636.1%2.5 pCi/L90.9 pCi/L52.9%+2.2 points
2005 to 20141,25433.9%2.3 pCi/L90.9 pCi/L52.4%First on file

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

Lucas County, Geology

The ground under Lucas County

Predicted

Most of the ground under Lucas County is one class on USGS's geologic map: 85.6% of its land is moderate radon potential, with 13.9% high. The map puts 85.5% of Lucas County in the area it calls Lake Plains and 13.9% in Till Plains. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 14, in the high band (12 to 17).

USGS's geologic areas under Lucas County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Lake PlainsGlacial lake deposits, Devonian shale and limestone.Moderate1085.5%
Till PlainsGlacial deposits underlain by Ordovician through Devonian limestone and shale.High1413.9%

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

Lucas County beside the ground around it

Ohio as a whole has more high-potential ground than Lucas County: 62.8% of its land, against 13.9% here. Of the 6 counties that border it, 4 have more high-potential ground, Wood County the most at 91.7%.

Share of land by USGS radon potential: Lucas County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Lucas CountyZone 2None85.6%13.9%
Wood CountyZone 2None8.3%91.7%
Fulton CountyZone 2None64.9%35.1%
Monroe County, MIZone 2None98.3%None
Henry CountyZone 2None25.7%74.3%
Lenawee County, MIZone 1None31.4%68.6%
Ottawa CountyZone 2None84.2%12.1%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Lucas County, Local resources

Radon testing and mitigation in Lucas County

Listed radon businesses with an address in Lucas County:

Listed radon professionals by town: Toledo, Sylvania, Waterville, Holland

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

Lucas County, Questions

Questions about radon in Lucas County

Are radon levels high in Lucas County?

Over the 2008 to 2017 laboratory totals, 40.2% of the radon tests reported to CDC for Lucas County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.0 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 64 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Lucas County?

Lucas County borders 6 counties: Wood County, OH, Fulton County, OH, Monroe County, MI, Henry County, OH, Lenawee County, MI and Ottawa County, OH.

Products

Lucas County, Products

Testing a home in Lucas County

In Lucas County, 40.2% of 1,381 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 Lucas County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Lucas County homes, compared

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Lucas County, Bordering counties

Counties bordering Lucas County

Calculated by Radon411

Lucas County, Cities and towns

Cities and towns in Lucas County

About 423,347 people live in Lucas County by the Census Bureau's estimate for July 1, 2025, 7,484 fewer than in 2020 (−1.7%). Packed into its land, that is 1,246 people per square mile. Toledo alone is home to 263,423 of them, 62.2% of the total. Reported testing is thin here: 1,381 tests over 2008 to 2017, or 3.3 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Toledo to Harbor View, CDC publishes no figure by town: each reads Lucas County's.

The cities and towns in Lucas County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Toledo263,423−2.5%62.2%
Oregon19,674−1.3%4.6%
Sylvania18,883−0.7%4.5%
Maumee13,521−2.5%3.2%
Waterville6,037+0.2%1.4%
Whitehouse5,073+1.4%1.2%
Ottawa Hills4,782−0.4%1.1%
Swantonextends beyond Lucas County3,866−0.4%Counted whole
Holland1,766−2.9%0.4%
Berkey281+2.6%Under 0.1%
Harbor View90LevelUnder 0.1%

11 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 Lucas County is counted whole, so it has no share.

Lucas County, Homes

Homes in Lucas County

Of Lucas County's 200,764 homes, 68% are detached houses, against 69% across Ohio; 18% are in buildings of five or more homes. The homes are older than Ohio's as a whole: half were built before 1962 (1970 for Ohio), and 47% date from before 1960. 62% 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 Lucas County, Ohio, 2019 to 2023
HomesLucas CountyOhio
Housing units200,7645,271,573
Detached houses68%69%
In buildings of 5 or more18%15%
Mobile homes2%4%
Built before 196047%38%
Built since 200011%16%
Middle year built19621970
Owner-occupied62%67%

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