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Radon Levels in Ashtabula County, Ohio

EPA puts Ashtabula County in Zone 2, its middle radon zone, and 34.4% of its 314 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

    34.4%

    17.9 pts below OH

    Ashtabula
    34.4%
    Ohio
    52.3%

    314 tests, 2008 to 2017

  • Median result

    2.5pCi/L

    Below action level

    Ashtabula
    2.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    314

    48th of 79 by tests

    Ashtabula
    314
    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

    73 of 79

    Lowest quarter

    Ashtabula
    34.4%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Ashtabula County

Starts at Ashtabula County's median, 2.5 pCi/L

2.5pCi/L

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

EPA’s reading of 2.5 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. Ashtabula County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Ashtabula County, At a glance

Ashtabula County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Ashtabula 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 Ashtabula County, 2008 to 2017, laboratory

Reported results by concentration band, Ashtabula County, 2008 to 2017, laboratory
Under 2 pCi/L: 41%2 to 4 pCi/L: 25%4 pCi/L and above: 34%

Of 314 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Ashtabula County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L12941.1%
2 to 4 pCi/L7724.5%
4 pCi/L and above10834.4%
What these figures count

These are the 314 tests reported to CDC for Ashtabula 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

Ashtabula County, Compared

Ashtabula County radon figures, compared

Calculated by Radon411

In Ashtabula County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (108 of 314) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 1.3 points lower. Across 88 Ohio counties pooled together, 52.3% of tests reached that level, so Ashtabula County runs 17.9 points below its state.

Of 5 neighbours with a figure, 1 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 23.4% (Geauga County) to 34.6% (Trumbull County). By share, Ashtabula County is 73rd of 79 Ohio counties with 30 or more tests for the same period.

Half the tests came in under 2.5 pCi/L and half over it; the single highest reached 125.2 pCi/L. Below the action level, 129 tests (41.1%) came in under 2 pCi/L, against 23.1% statewide, and 77 tests (24.5%) 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 34.4% share point the same way here. USGS geology rates 100% of the county's land moderate radon potential. CDC also counts 13 tests taken after mitigation in Ashtabula County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Ashtabula County went from 262 tests (2005 to 2014) to 314 (2008 to 2017), the share going from 38.9% to 34.4%.

Ashtabula County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Ashtabula County
Ashtabula County31434.4%2.5 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled+17.9 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+1.3 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+47.0 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−12.7 points
Trumbull County, OHborders it42534.6%2.9 pCi/L+0.2 points
Crawford County, PAborders it1,42233.4%2.7 pCi/L−1.0 points
Erie County, PAborders it6,30931.8%2.6 pCi/L−2.6 points
Lake County, OHborders it2,34927.2%2.4 pCi/L−7.2 points
Geauga County, OHborders it1,46923.4%2.4 pCi/L−11.0 points
Where Ashtabula County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultAshtabula County testsAshtabula County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L12941.1%23.1%39.6%+18.0 points
2 to 4 pCi/L7724.5%24.6%24.7%−0.1 points
4 pCi/L and above10834.4%52.3%35.7%−17.9 points
Ashtabula 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
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
Geauga County78 of 791,46923.4%2.4 pCi/L
Ashtabula County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 201731434.4%2.5 pCi/L125.2 pCi/L52.3%−4.2 points
2007 to 201629338.6%2.7 pCi/L125.2 pCi/L52.8%−0.3 points
2006 to 201530338.9%2.7 pCi/L125.2 pCi/L52.9%Level
2005 to 201426238.9%2.7 pCi/L125.2 pCi/L52.4%First on file

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

Ashtabula County, Geology

The ground under Ashtabula County

Predicted

USGS's geologic map puts all of Ashtabula County's mapped land in one class: moderate radon potential. The map puts 84.7% of Ashtabula County in the area it calls Glaciated Plateau and 15.2% in Lake Plains. USGS gives the first a radon index of 11 and the second 10, both in the moderate band (9 to 11).

USGS's geologic areas under Ashtabula County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glaciated PlateauDevonian, Mississippian and Permian carbonates and shales.Moderate1184.7%
Lake PlainsGlacial lake deposits, Devonian shale and limestone.Moderate1015.2%

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

Ashtabula County beside the ground around it

Across Ohio 62.8% of the land is rated high; none of Ashtabula County's is. Of the 5 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: Ashtabula County, the 5 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Ashtabula CountyZone 2None99.9%None
Lake CountyZone 2None99.7%None
Geauga CountyZone 2None100%None
Trumbull CountyZone 2None100%None
Crawford County, PAZone 2None96.1%3.9%
Erie County, PAZone 2None98.7%0.2%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Ashtabula County, Local resources

Radon testing and mitigation in Ashtabula County

Listed radon businesses with an address in Ashtabula County:

Listed radon professionals by town: Geneva, Jefferson

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

Ashtabula County, Questions

Questions about radon in Ashtabula County

Are radon levels high in Ashtabula County?

Over the 2008 to 2017 laboratory totals, 34.4% of the radon tests reported to CDC for Ashtabula County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.5 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 72 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Ashtabula County?

Ashtabula County borders 5 counties: Lake County, OH, Geauga County, OH, Trumbull County, OH, Crawford County, PA and Erie County, PA.

Products

Ashtabula County, Products

Testing a home in Ashtabula County

In Ashtabula County, 34.4% of 314 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 Ashtabula County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Ashtabula County homes, compared

Explore

Ashtabula County, Bordering counties

Counties bordering Ashtabula County

Calculated by Radon411

Ashtabula County, Cities and towns

Cities and towns in Ashtabula County

About 96,713 people live in Ashtabula County by the Census Bureau's estimate for July 1, 2025, 784 fewer than in 2020 (−0.8%). That works out to 138 people per square mile of land. No town dominates: Ashtabula, the largest, has 17,474 residents, 18.1% of the total. Together its 10 incorporated places hold 48.6% of those residents; the other 51.4% live outside any of them. Reported testing is thin here: 314 tests over 2008 to 2017, or 3.2 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Ashtabula to Rock Creek, CDC publishes no figure by town: each reads Ashtabula County's.

The cities and towns in Ashtabula County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Ashtabula17,474−2.7%18.1%
Conneaut12,247−0.4%12.7%
Geneva5,806−1.8%6.0%
Jefferson3,148−2.0%3.3%
North Kingsville2,685−2.2%2.8%
Roaming Shores1,600+1.0%1.7%
Orwell1,499−0.7%1.5%
Geneva-on-the-Lake939−0.6%1.0%
Andover920−3.9%1.0%
Rock Creek655−2.8%0.7%

10 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).

Ashtabula County, Homes

Homes in Ashtabula County

Ashtabula County is a place of houses on their own lots: 77% of its 46,362 homes are detached single-family houses, against 69% across Ohio. The homes are older than Ohio's as a whole: half were built before 1962 (1970 for Ohio), and 48% date from before 1960. 74% 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 Ashtabula County, Ohio, 2019 to 2023
HomesAshtabula CountyOhio
Housing units46,3625,271,573
Detached houses77%69%
In buildings of 5 or more7%15%
Mobile homes9%4%
Built before 196048%38%
Built since 200010%16%
Middle year built19621970
Owner-occupied74%67%

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