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Radon in Toledo, Ohio

EPA puts Lucas County, where Toledo is, 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%

    Lucas, 65th of 79 in OH, 2008 to 2017

  • Median result

    3.0pCi/L

    Below action level

    Lucas
    3.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Lucas's tests, 2008 to 2017

  • Nearest county

    45.5%

    Wood, 21 miles

    Wood
    45.5%
    Lucas
    40.2%

    1,192 tests, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    Lucas, where Toledo is

  • Tests reported

    1,381

    In Lucas

    Lucas
    1,381
    Wood
    1,192

    Reported to CDC before any fix, 2008 to 2017

Read a result for Toledo

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

Toledo, What is published

What is published for Toledo

Information:

Every figure for Toledo is a county's

Radon data is published by county, not by city, so for Toledo it is Lucas County's: its EPA zone (Zone 2) and the 1,381 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.

Toledo covers 80.5 square miles of land, all of it in Lucas County. About 263,423 people live there, 3,273 to the square mile.

Toledo, Counties

The county Toledo lies in

Measured

Lucas County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.

Lucas CountyZone 2Moderate predicted potential

40.2%
Reported tests at or above 4 pCi/L
3.0 pCi/L
Median reported result
1,381 tests
Tests reported to CDC
None
Yearly figures on file

Lucas County ranks 65th of 79 Ohio counties with 30 or more tests for that period, 12.1 points below the 52.3% pooled across Ohio's counties, 4.5 points above the national pool of 35.7%.

The counties nearest Toledo with a CDC figure for 2008 to 2017, laboratory, measured from the middle of the city: Wood County (21 miles, 45.5% of 1,192 tests), Ottawa County (24 miles, 40.3% of 541 tests) and Fulton County (29 miles, 45.2% of 62 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 40.3% to 61.8%; the farthest of them, Defiance County, is 53 miles away at 48.6%.

The directory lists 1 business with an address in Toledo, 1 for mitigation. Ohio's other cities with a page of their own: Columbus, Dayton, Cincinnati and Cleveland.

The counties around Toledo

By distance from the middle of Toledo; counties with 30 or more tests.

Nearest counties to Toledo with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Wood County21 mi1,19245.5%3.5 pCi/L
Ottawa County24 mi54140.3%2.9 pCi/L
Fulton County29 mi6245.2%3.1 pCi/L
Sandusky County31 mi64959.2%5.0 pCi/L
Henry County34 mi3461.8%5.3 pCi/L
Seneca County44 mi54058.9%4.9 pCi/L
Hancock County46 mi1,38246.2%3.7 pCi/L
Defiance County53 mi7048.6%3.8 pCi/L

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.

Toledo, Geology

The ground under Toledo

Predicted

USGS's geologic map puts all of Toledo's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Lake Plains, to which USGS gives a radon index of 10, in the moderate band (9 to 11).

USGS's geologic areas under Toledo
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Lake PlainsGlacial lake deposits, Devonian shale and limestone.Moderate1099.9%

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

Toledo beside its county and Ohio

Lucas County as a whole has 13.9% of its land rated high; none of that ground lies under Toledo. Across Ohio 62.8% of the land is rated high; none of Toledo's is.

Share of land by USGS radon potential: Toledo, the county it lies in and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
ToledoBy countyNone99.9%None
Lucas CountyZone 2None85.6%13.9%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Toledo, Homes

Homes in Toledo

Of Toledo's 133,195 homes, 65% are detached houses, against 68% across Lucas County; 20% are in buildings of five or more homes. Half of its homes were built before 1955, close to Lucas County's 1962: 59% date from before 1960 and 6% from 2000 or later. 53% of occupied homes are lived in by their owner (Lucas County: 62%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Toledo, Lucas County, Ohio, 2019 to 2023
HomesToledoLucas CountyOhio
Housing units133,195200,7645,271,573
Detached houses65%68%69%
In buildings of 5 or more20%18%15%
Mobile homes2%2%4%
Built before 196059%47%38%
Built since 20006%11%16%
Middle year built195519621970
Owner-occupied53%62%67%

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

Local help

Toledo, Professionals

Radon professionals listed in Toledo

Businesses whose listed city is Toledo, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.

1 listing with Toledo as the city. See radon mitigation in Toledo, or all radon professionals in Ohio.

Toledo, Local resources

Local resources for Toledo

Who to ask in Ohio: its radon program, test kits and professionals.

The program's own words on licensing are on the Ohio page.

What it means

Toledo, Questions

Questions about radon in Toledo

What radon zone is Toledo in?

Toledo takes its zone from Lucas County, which EPA puts in Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.

What are radon levels in Toledo?

40.2% of the 1,381 tests reported from Lucas County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home: high results are ordinary around Toledo. The median reported result was 3.0 pCi/L.

Should I test my home in Toledo?

Yes. About 555 of the 1,381 tests reported from Lucas County were at or above 4 pCi/L. That is below Ohio's pooled 52.3%, and still not a reason to skip it, and ranks Lucas County 65th of the 79 Ohio counties with 30 or more tests. No map says which homes those are. How to test a home.

What ground is Toledo built on, as far as radon goes?

USGS's geologic map puts all of Toledo on one named area, "Lake Plains", rated moderate for radon potential, radon index 10.

Is radon higher in the counties around Toledo?

Yes, in every direction measured. Each of the 8 nearest counties with a figure reports a larger share of high tests than Lucas County's 40.2%; the highest is Henry County (61.8%, 34 miles off).

Who tests for or fixes radon in Toledo?

Radon411's directory has one business with an address in Toledo, listed for mitigation, none for testing. Every entry names the public list it was taken from. Radon professionals in Toledo.

The answers use the published figures of Lucas County, the county Toledo lies in.

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