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Radon Levels in Trumbull County, Ohio

EPA puts Trumbull County in Zone 2, its middle radon zone, and 34.6% of its 425 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

    34.6%

    17.7 pts below OH

    Trumbull
    34.6%
    Ohio
    52.3%

    425 tests, 2008 to 2017

  • Median result

    2.9pCi/L

    Below action level

    Trumbull
    2.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    425

    41st of 79 by tests

    Trumbull
    425
    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

    72 of 79

    Lowest quarter

    Trumbull
    34.6%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Trumbull County

Starts at Trumbull County's median, 2.9 pCi/L

2.9pCi/L

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

EPA’s reading of 2.9 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. Trumbull County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Trumbull County, At a glance

Trumbull County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Trumbull 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 Trumbull County, 2008 to 2017, laboratory

Reported results by concentration band, Trumbull County, 2008 to 2017, laboratory
Under 2 pCi/L: 30%2 to 4 pCi/L: 35%4 pCi/L and above: 35%

Of 425 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Trumbull County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L13030.6%
2 to 4 pCi/L14834.8%
4 pCi/L and above14734.6%
What these figures count

These are the 425 tests reported to CDC for Trumbull 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

Trumbull County, Compared

Trumbull County radon figures, compared

Calculated by Radon411

In Trumbull County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (147 of 425) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.1 points lower. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Trumbull County runs 17.7 points below its state.

Of 6 neighbours with a figure, 2 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 23.4% (Mahoning County) to 39.3% (Portage County). By share, Trumbull County is 72nd of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 2.9 pCi/L and half over it; the single highest reached 23.5 pCi/L. Below the action level, 130 tests (30.6%) came in under 2 pCi/L, against 23.1% statewide, and 148 tests (34.8%) 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 34.6% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 25 tests taken after mitigation in Trumbull County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Trumbull County went from 356 tests (2005 to 2014) to 425 (2008 to 2017), the share going from 30.1% to 34.6%.

Trumbull County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Trumbull County
Trumbull County42534.6%2.9 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+17.7 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+1.1 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+46.8 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−12.9 points
Portage County, OHborders it1,66139.3%3.2 pCi/L+4.7 points
Mercer County, PAborders it1,40836.7%3.0 pCi/L+2.1 points
Ashtabula County, OHborders it31434.4%2.5 pCi/L−0.2 points
Crawford County, PAborders it1,42233.4%2.7 pCi/L−1.2 points
Geauga County, OHborders it1,46923.4%2.4 pCi/L−11.2 points
Mahoning County, OHborders it66623.4%2.5 pCi/L−11.2 points
Where Trumbull County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultTrumbull County testsTrumbull County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L13030.6%23.1%39.6%+7.5 points
2 to 4 pCi/L14834.8%24.6%24.7%+10.2 points
4 pCi/L and above14734.6%52.3%35.7%−17.7 points
Trumbull 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
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
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
Trumbull County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 201742534.6%2.9 pCi/L23.5 pCi/L52.3%+2.1 points
2007 to 201640032.5%2.8 pCi/L23.5 pCi/L52.8%+1.3 points
2006 to 201538131.2%2.7 pCi/L23.5 pCi/L52.9%+1.1 points
2005 to 201435630.1%2.6 pCi/L23.5 pCi/L52.4%First on file

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

Trumbull County, Geology

The ground under Trumbull County

Predicted

USGS's geologic map puts all of Trumbull 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 Trumbull 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.

Trumbull County beside the ground around it

Across Ohio 62.8% of the land is rated high; none of Trumbull County's is. Of the 6 counties that border it, 2 have more high-potential ground, Crawford County, PA the most at 3.9%.

Share of land by USGS radon potential: Trumbull County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Trumbull CountyZone 2None100%None
Mahoning CountyZone 2None100%None
Portage CountyZone 2None100%None
Mercer County, PAZone 2None99.1%0.9%
Geauga CountyZone 2None100%None
Ashtabula CountyZone 2None99.9%None
Crawford County, PAZone 2None96.1%3.9%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Trumbull County, Local resources

Radon testing and mitigation in Trumbull County

Listed radon businesses with an address in Trumbull County:

Listed radon professionals by town: Youngstown, Warren, Niles, Girard, Newton Falls

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

Trumbull County, Questions

Questions about radon in Trumbull County

Are radon levels high in Trumbull County?

Over the 2008 to 2017 laboratory totals, 34.6% of the radon tests reported to CDC for Trumbull County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.9 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 71 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Trumbull County?

Trumbull County borders 6 counties: Mahoning County, OH, Portage County, OH, Mercer County, PA, Geauga County, OH, Ashtabula County, OH and Crawford County, PA.

Products

Trumbull County, Products

Testing a home in Trumbull County

In Trumbull County, 34.6% of 425 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 Trumbull County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Trumbull County homes, compared

Explore

Trumbull County, Bordering counties

Counties bordering Trumbull County

Calculated by Radon411

Trumbull County, Cities and towns

Cities and towns in Trumbull County

About 198,972 people live in Trumbull County by the Census Bureau's estimate for July 1, 2025, 2,692 fewer than in 2020 (−1.3%). That works out to 322 people per square mile of land. Youngstown, the largest place on its list (58,832 residents in all), extends beyond Trumbull County, so no share of the total is worked out for it. Reported testing is thin here: 425 tests over 2008 to 2017, or 2.1 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Youngstown to Yankee Lake, CDC publishes no figure by town: each reads Trumbull County's.

The cities and towns in Trumbull County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Youngstownextends beyond Trumbull County58,832−1.8%Counted whole
Warren38,328−2.0%19.3%
Niles18,116−1.6%9.1%
Girard9,384−2.0%4.7%
Hubbard7,528−1.2%3.8%
Cortland7,024−1.0%3.5%
Newton Falls4,504−1.2%2.3%
Lordstown3,303−0.4%1.7%
McDonald3,096−2.1%1.6%
West Farmington530−1.3%0.3%
Orangeville170−2.9%Under 0.1%
Yankee Lake74−1.3%Under 0.1%

12 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 Trumbull County is counted whole, so it has no share.

Trumbull County, Homes

Homes in Trumbull County

Trumbull County is a place of houses on their own lots: 77% of its 94,510 homes are detached single-family houses, against 69% across Ohio. Half of its homes were built before 1964, close to Ohio's 1970: 44% date from before 1960 and 7% from 2000 or later. 72% 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 Trumbull County, Ohio, 2019 to 2023
HomesTrumbull CountyOhio
Housing units94,5105,271,573
Detached houses77%69%
In buildings of 5 or more9%15%
Mobile homes5%4%
Built before 196044%38%
Built since 20007%16%
Middle year built19641970
Owner-occupied72%67%

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