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Radon Levels in Auglaize County, Ohio

EPA puts Auglaize County in Zone 1, its highest radon zone, and high results are common there: 71.2% of the 139 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

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  • Share at 4+ pCi/L

    71.2%

    18.9 pts above OH

    Auglaize
    71.2%
    Ohio
    52.3%

    139 tests, 2008 to 2017

  • Median result

    6.5pCi/L

    Action level reached

    Auglaize
    6.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    139

    59th of 79 by tests

    Auglaize
    139
    Franklin
    16,142

    Reported to CDC before any fix, 2008 to 2017

  • 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

  • Rank in Ohio

    8 of 79

    Top quarter

    Auglaize
    71.2%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Auglaize County

Starts at Auglaize County's median, 6.5 pCi/L

6.5pCi/L

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

EPA’s reading of 6.5 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. Auglaize County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Auglaize County, At a glance

Auglaize County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Auglaize 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 Auglaize County, 2008 to 2017, laboratory

Reported results by concentration band, Auglaize County, 2008 to 2017, laboratory
Under 2 pCi/L: 12%2 to 4 pCi/L: 17%4 pCi/L and above: 71%

Of 139 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Auglaize County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1712.2%
2 to 4 pCi/L2316.5%
4 pCi/L and above9971.2%
What these figures count

These are the 139 tests reported to CDC for Auglaize 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

Auglaize County, Compared

Auglaize County radon figures, compared

Calculated by Radon411

More than half: 71.2% of the 139 radon tests reported to CDC for Auglaize County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 8th of 79 Ohio counties with 30 or more tests for the same period. That is 18.9 points above the 52.3% pooled from 88 Ohio counties.

The median result, 6.5 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 31.1 pCi/L. The rest split 12.2% under 2 pCi/L and 16.5% from 2 to 4 (Ohio: 23.1% and 24.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 71.2% share point the same way here.

1 of its 6 bordering counties with figures ran higher, led by Logan County at 73.6%; Hardin County reported 43.3%. Statewide for the same period, Pickaway County reported the highest share (81.4%) and Cuyahoga County the lowest (21.7%).

CDC's ten-year totals for Auglaize County went from 121 tests (2005 to 2014) to 139 (2008 to 2017), the share going from 71.9% to 71.2%.

Nationally, every county with a figure for the same period pools to 35.7%; Auglaize County sits 35.5 points above it. CDC also counts 8 tests taken after mitigation in Auglaize County for the same period: tests in homes where a fix was already in.

Auglaize County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Auglaize County
Auglaize County13971.2%6.5 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled−18.9 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−35.5 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+10.2 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−49.5 points
Logan County, OHborders it75573.6%7.9 pCi/L+2.4 points
Darke County, OHborders it27063.7%5.6 pCi/L−7.5 points
Shelby County, OHborders it24860.1%5.2 pCi/L−11.1 points
Mercer County, OHborders it14957.7%5.1 pCi/L−13.5 points
Allen County, OHborders it23856.7%5.0 pCi/L−14.5 points
Van Wert County, OHborders it2653.8%4.3 pCi/L−17.4 points
Hardin County, OHborders it6743.3%3.4 pCi/L−27.9 points
Where Auglaize County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultAuglaize County testsAuglaize County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L1712.2%23.1%39.6%−10.9 points
2 to 4 pCi/L2316.5%24.6%24.7%−8.1 points
4 pCi/L and above9971.2%52.3%35.7%+18.9 points
Auglaize 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
Logan County3 of 7975573.6%7.9 pCi/L
Delaware County4 of 793,73072.2%6.4 pCi/L
Knox County5 of 791,53072.0%8.1 pCi/L
Franklin County6 of 7916,14271.9%6.8 pCi/L
Licking County7 of 794,69471.2%7.0 pCi/L
Auglaize County8 of 7913971.2%6.5 pCi/L
Champaign County9 of 7959671.1%6.8 pCi/L
Madison County10 of 7954967.4%5.7 pCi/L
Ross County11 of 7936867.1%7.0 pCi/L
Tuscarawas County12 of 7954766.4%5.6 pCi/L
Marion County13 of 7926565.3%6.4 pCi/L
Auglaize County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 201713971.2%6.5 pCi/L31.1 pCi/L52.3%−0.3 points
2007 to 201613771.5%6.5 pCi/L51.1 pCi/L52.8%−2.2 points
2006 to 201513773.7%6.5 pCi/L51.1 pCi/L52.9%+1.8 points
2005 to 201412171.9%6.5 pCi/L51.1 pCi/L52.4%First on file

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

Auglaize County, Geology

The ground under Auglaize County

Predicted

USGS's geologic map puts all of Auglaize County's mapped land in one class: high radon potential. 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 Auglaize County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Till PlainsGlacial deposits underlain by Ordovician through Devonian limestone and shale.High14100%

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

Auglaize County beside the ground around it

Auglaize County has more high-potential ground than Ohio as a whole: 100% of its land against 62.8%. Of the 7 counties that border it, none has as large a share of high-potential ground; Allen County comes nearest at 100%.

Share of land by USGS radon potential: Auglaize County, the 7 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Auglaize CountyZone 1NoneNone100%
Shelby CountyZone 1NoneNone100%
Allen CountyZone 1NoneNone100%
Mercer CountyZone 1NoneNone100%
Logan CountyZone 1NoneNone100%
Van Wert CountyZone 1None0.1%99.9%
Darke CountyZone 1NoneNone100%
Hardin CountyZone 1NoneNone100%
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Auglaize County, Local resources

Radon testing and mitigation in Auglaize County

Listed radon businesses with an address in Auglaize County:

Listed radon professionals by town: Wapakoneta

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

Auglaize County, Questions

Questions about radon in Auglaize County

Are radon levels high in Auglaize County?

Over the 2008 to 2017 laboratory totals, 71.2% of the radon tests reported to CDC for Auglaize County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 6.5 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 7 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Auglaize County?

Auglaize County borders 7 counties: Shelby County, Allen County, Mercer County, Logan County, Van Wert County, Darke County and Hardin County.

Products

Auglaize County, Products

Testing a home in Auglaize County

In Auglaize County, 71.2% of 139 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 1 the year-round level in Auglaize 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

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

Explore

Auglaize County, Bordering counties

Counties bordering Auglaize County

Calculated by Radon411

Auglaize County, Cities and towns

Cities and towns in Auglaize County

About 45,909 people live in Auglaize County by the Census Bureau's estimate for July 1, 2025, 557 fewer than in 2020 (−1.2%). That works out to 114 people per square mile of land. Its largest town, Wapakoneta, has 9,711 residents, 21.2% of the total. Reported testing is thin here: 139 tests over 2008 to 2017, or 3.0 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Wapakoneta to Buckland, CDC publishes no figure by town: each reads Auglaize County's.

The cities and towns in Auglaize County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Wapakoneta9,711−2.4%21.2%
St. Marys8,398−0.1%18.3%
Minsterextends beyond Auglaize County3,062−1.3%Counted whole
New Bremen3,017−0.6%6.6%
Cridersville1,767−2.3%3.8%
New Knoxville912−2.8%2.0%
Waynesfield739−2.4%1.6%
Buckland228−3.8%0.5%

8 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 Auglaize County is counted whole, so it has no share.

Auglaize County, Homes

Homes in Auglaize County

Auglaize County is a place of houses on their own lots: 81% of its 20,034 homes are detached single-family houses, against 69% across Ohio. Half of its homes were built before 1971, close to Ohio's 1970: 42% date from before 1960 and 13% from 2000 or later. Owners live in 76% of the occupied homes (Ohio: 67%), so for most households a test and a fix are their own to order.

Homes in Auglaize County, Ohio, 2019 to 2023
HomesAuglaize CountyOhio
Housing units20,0345,271,573
Detached houses81%69%
In buildings of 5 or more6%15%
Mobile homes4%4%
Built before 196042%38%
Built since 200013%16%
Middle year built19711970
Owner-occupied76%67%

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