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Radon Levels in Van Wert County, Ohio

EPA puts Van Wert County in Zone 1, its highest radon zone, and only 26 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). 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

  • Highest bordering

    71.2%

    Auglaize County

    Auglaize
    71.2%
    Allen
    41.8%

    6 of 7 neighbours have 30+ tests, 2008 to 2017

  • Nearest county

    57.7%

    Mercer County, 22 miles

    Mercer
    57.7%
    Ohio
    52.3%

    Share at 4+ pCi/L, 149 tests, 2008 to 2017

  • Ground above low

    100.0%

    0.1 pts above Ohio

    Van Wert
    100.0%
    Ohio
    99.9%

    Share of land USGS rates moderate or high potential

  • Tests reported

    28

    Too few for a share

    Van Wert
    28
    Needed
    30

    2005 to 2014, laboratory

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

Read a result for Van Wert County

Starts at EPA's action level

4.0pCi/L

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

EPA’s reading of 4.0 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.

Interpret this readingWhat a fix costs

The data

Van Wert County, At a glance

Van Wert County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Van Wert County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Van Wert County, 2008 to 2017, laboratory

CDC holds 26 reported tests for Van Wert County over the 2008 to 2017 laboratory totals, with a median of 4.3 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Van Wert County beside the counties around it is how this page reads it.

What these figures count

Only 26 tests were reported to CDC for Van Wert County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor 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

Van Wert County, Compared

Van Wert County radon figures, compared

Calculated by Radon411

CDC's largest figure for Van Wert County rests on 28 tests over the 2005 to 2014 laboratory totals, 16 of them at or above 4 pCi/L, so each test moves its share by 3.6 points and no rank or comparison is drawn from it. Results reached as high as 21.4 pCi/L, with a middle value of 4.8 pCi/L.

Of the counties bordering it, 6 have a figure over the 2008 to 2017 laboratory totals: Auglaize County reported the largest share at or above 4 pCi/L, 71.2%, and Allen County, IN the smallest, 41.8%, with Putnam County at 59.6%, Mercer County at 57.7% and Allen County at 56.7% between. Farther out, Defiance County (33 miles away) at 48.6%, Shelby County (41 miles away) at 60.1% and Henry County (43 miles away) at 61.8% have figures too. Pooled across 88 Ohio counties, 52.3% of reported tests reached that level; across every county in the country with a figure, 35.7%.

Statewide for the same period, Pickaway County reported the highest share (81.4%) and Cuyahoga County the lowest (21.7%). EPA's 1993 map puts Van Wert County in Zone 1, the map's highest label: a predicted county average above 4 pCi/L. USGS geology rates 100% of the county's land high radon potential.

Ohio, the United States and the counties around Van Wert County, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedian
Ohio, pooled88 counties, pooled98,84052.3%Not pooled
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled
Pickaway Countyhighest in the state18381.4%9.5 pCi/L
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L
Auglaize County, OHborders it13971.2%6.5 pCi/L
Putnam County, OHborders it9459.6%4.8 pCi/L
Mercer County, OHborders it14957.7%5.1 pCi/L
Allen County, OHborders it23856.7%5.0 pCi/L
Adams County, INborders it6648.5%3.8 pCi/L
Allen County, INborders it3,99041.8%3.3 pCi/L
Paulding County, OHborders it1323.1%3.2 pCi/L
The nearest Ohio counties to Van Wert County with 30 or more tests, 2008 to 2017, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Mercer County22 mi14957.7%5.1 pCi/L
Allen County26 mi23856.7%5.0 pCi/L
Putnam County26 mi9459.6%4.8 pCi/L
Auglaize County28 mi13971.2%6.5 pCi/L
Defiance County33 mi7048.6%3.8 pCi/L
Shelby County41 mi24860.1%5.2 pCi/L
Henry County43 mi3461.8%5.3 pCi/L
Hancock County49 mi1,38246.2%3.7 pCi/L
Van Wert County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 20172653.8%4.3 pCi/L21.4 pCi/L52.3%+10.9 points
2007 to 20162142.9%3.7 pCi/L21.4 pCi/L52.8%−10.9 points
2006 to 20152653.8%4.2 pCi/L21.4 pCi/L52.9%−3.3 points
2005 to 20142857.1%4.8 pCi/L21.4 pCi/L52.4%First on file

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

Van Wert County, Geology

The ground under Van Wert County

Predicted

Most of the ground under Van Wert County is one class on USGS's geologic map: 99.9% of its land is high radon potential, with 0.1% moderate. All of it lies in the area the map calls Till Plains, to which USGS gives a radon index of 14, in the high band (12 to 17).

USGS's geologic areas under Van Wert County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Till PlainsGlacial deposits underlain by Ordovician through Devonian limestone and shale.High1499.9%

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

Van Wert County beside the ground around it

Van Wert County has more high-potential ground than Ohio as a whole: 99.9% of its land against 62.8%. Of the 7 counties that border it, 5 have more high-potential ground, Adams County, IN the most at 100%.

Share of land by USGS radon potential: Van Wert County, the 7 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Van Wert CountyZone 1None0.1%99.9%
Paulding CountyZone 2None57.6%42.4%
Adams County, INZone 1NoneNone100%
Allen CountyZone 1NoneNone100%
Mercer CountyZone 1NoneNone100%
Auglaize CountyZone 1NoneNone100%
Putnam CountyZone 2None32.3%67.7%
Allen County, INZone 1NoneNone100%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Van Wert County, Local resources

Radon testing and mitigation in Van Wert County

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

Van Wert County, Questions

Questions about radon in Van Wert County

Are radon levels high in Van Wert County?

Over the 2008 to 2017 laboratory totals, 53.8% of the radon tests reported to CDC for Van Wert County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.3 pCi/L. Of the counties bordering it, 6 have a figure over the 2008 to 2017 laboratory totals: Auglaize County reported the largest share at or above 4 pCi/L, 71.2%, and Allen County, IN the smallest, 41.8%, with Putnam County at 59.6%, Mercer County at 57.7% and Allen County at 56.7% between.

Which counties border Van Wert County?

Van Wert County borders 7 counties: Paulding County, OH, Adams County, IN, Allen County, OH, Mercer County, OH, Auglaize County, OH, Putnam County, OH and Allen County, IN.

Products

Van Wert County, Products

Testing a home in Van Wert County

No CDC figure names Van Wert County; the nearest county with one, Mercer County (22 miles away), reported 57.7% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. In Zone 1 the year-round level in Van Wert County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Van Wert County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Van Wert County

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Van Wert County, Bordering counties

Counties bordering Van Wert County

Calculated by Radon411

Van Wert County, Cities and towns

Cities and towns in Van Wert County

Van Wert County's population has barely moved since 2020: 29,013 residents on July 1, 2025 against 28,922 then, by the Census Bureau's estimates. That works out to 71 people per square mile of land. Its largest town, Van Wert, has 11,200 residents, 38.6% of the total. Reported testing is thin here: 28 tests over 2005 to 2014, or 1.0 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 7.0.

From Van Wert to Elgin, CDC publishes no figure by town: each reads Van Wert County's.

The cities and towns in Van Wert County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Van Wert11,200+0.7%38.6%
Delphosextends beyond Van Wert County7,096−0.3%Counted whole
Convoy1,006−0.7%3.5%
Ohio City645−1.2%2.2%
Middle Point570+0.2%2.0%
Willshire398−1.7%1.4%
Scottextends beyond Van Wert County236−1.3%Counted whole
Wren151−1.9%0.5%
Venedocia138Level0.5%
Elgin46Level0.2%

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). A place that extends beyond Van Wert County is counted whole, so it has no share.

Van Wert County, Homes

Homes in Van Wert County

Van Wert County is a place of houses on their own lots: 87% of its 12,574 homes are detached single-family houses, against 69% across Ohio. The homes are older than Ohio's as a whole: half were built before 1960 (1970 for Ohio), and 50% date from before 1960. Owners live in 81% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.

Homes in Van Wert County, Ohio, 2019 to 2023
HomesVan Wert CountyOhio
Housing units12,5745,271,573
Detached houses87%69%
In buildings of 5 or more3%15%
Mobile homes4%4%
Built before 196050%38%
Built since 200011%16%
Middle year built19601970
Owner-occupied81%67%

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