Skip to content
RADON411

Locations and reports

Radon Levels in Wayne County, Indiana

EPA puts Wayne County in Zone 1, its highest radon zone, and high results are common there: 56.4% of the 140 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

    56.4%

    17.5 pts above IN

    Wayne
    56.4%
    Indiana
    38.9%

    140 tests, 2008 to 2017

  • Median result

    4.5pCi/L

    Action level reached

    Wayne
    4.5 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    140

    35th of 69 by tests

    Wayne
    140
    St. Joseph
    7,346

    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 Indiana

    9 of 69

    Top quarter

    Wayne
    56.4%
    Miami
    63.3%

    By share, of 69 with 30+ tests

Read a result for Wayne County

Starts at Wayne County's median, 4.5 pCi/L

4.5pCi/L

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

EPA’s reading of 4.5 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. Wayne County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Wayne County, At a glance

Wayne County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

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

Reported results by concentration band, Wayne County, 2008 to 2017, laboratory
Under 2 pCi/L: 23%2 to 4 pCi/L: 21%4 pCi/L and above: 56%

Of 140 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Wayne County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L3222.9%
2 to 4 pCi/L2920.7%
4 pCi/L and above7956.4%
What these figures count

These are the 140 tests reported to CDC for Wayne 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

Wayne County, Compared

Wayne County radon figures, compared

Calculated by Radon411

More than half: 56.4% of the 140 radon tests reported to CDC for Wayne County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 9th of 69 Indiana counties with 30 or more tests for the same period. That is 17.5 points above the 38.9% pooled from 92 Indiana counties.

The median result, 4.5 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 103.6 pCi/L. The rest split 22.9% under 2 pCi/L and 20.7% from 2 to 4 (Indiana: 32.8% and 28.3%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 56.4% share point the same way here.

2 of its 3 bordering counties with figures ran higher, led by Darke County, OH at 63.7%; Henry County reported 50.5%. Statewide for the same period, Miami County reported the highest share (63.3%) and Jasper County the lowest (14.1%).

CDC's ten-year totals for Wayne County went from 175 tests (2005 to 2014) to 140 (2008 to 2017), the share going from 56.6% to 56.4%.

Nationally, every county with a figure for the same period pools to 35.7%; Wayne County sits 20.7 points above it. CDC also counts 60 tests taken after mitigation in Wayne County for the same period: tests in homes where a fix was already in.

Wayne County against Indiana, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Wayne County
Wayne County14056.4%4.5 pCi/LThis county
Indiana, pooled92 counties, pooled43,14838.9%Not pooled−17.5 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−20.7 points
Miami Countyhighest in the state3063.3%5.3 pCi/L+6.9 points
Jasper Countylowest in the state7114.1%1.2 pCi/L−42.3 points
Fayette County, INborders it1376.9%7.9 pCi/L+20.5 points
Darke County, OHborders it27063.7%5.6 pCi/L+7.3 points
Preble County, OHborders it21262.7%5.5 pCi/L+6.3 points
Randolph County, INborders it2860.7%4.5 pCi/L+4.3 points
Henry County, INborders it9550.5%4.0 pCi/L−5.9 points
Union County, INborders it850.0%3.8 pCi/L−6.4 points
Where Wayne County's reported results fell, 2008 to 2017, laboratory, beside Indiana and the United States
ResultWayne County testsWayne County shareIndiana shareU.S. shareAgainst Indiana
Under 2 pCi/L3222.9%32.8%39.6%−9.9 points
2 to 4 pCi/L2920.7%28.3%24.7%−7.6 points
4 pCi/L and above7956.4%38.9%35.7%+17.5 points
Wayne County ranked among the 69 Indiana counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Carroll County4 of 693860.5%5.8 pCi/L
Wabash County5 of 699159.3%5.8 pCi/L
Grant County6 of 697958.2%4.6 pCi/L
LaPorte County7 of 6979258.2%5.0 pCi/L
DeKalb County8 of 6924256.6%4.4 pCi/L
Wayne County9 of 6914056.4%4.5 pCi/L
Steuben County10 of 6914055.7%4.5 pCi/L
Delaware County11 of 6918755.1%4.2 pCi/L
Fountain County12 of 696055.0%4.6 pCi/L
Noble County13 of 6913652.9%4.3 pCi/L
Whitley County14 of 6918451.6%4.0 pCi/L
Wayne County ten-year laboratory totals, against Indiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestIndiana, pooledChange from the row before
2008 to 201714056.4%4.5 pCi/L103.6 pCi/L38.9%+4.1 points
2007 to 201615352.3%4.4 pCi/L103.6 pCi/L39.2%−3.3 points
2006 to 201516955.6%4.4 pCi/L103.6 pCi/L39.6%−1.0 points
2005 to 201417556.6%4.5 pCi/L103.6 pCi/L39.3%First on file

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

Wayne County, Geology

The ground under Wayne County

Predicted

USGS's geologic map puts all of Wayne County's mapped land in one class: high radon potential. All of it lies in the area the map calls Huron-Erie Lobe, to which USGS gives a radon index of 13, in the high band (12 to 17).

USGS's geologic areas under Wayne County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Huron-Erie LobeCalcareous clayey and loamy glacial deposits derived from marine carbonate and clastic sedimentary rocks.High1399.8%

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

Wayne County beside the ground around it

Wayne County has more high-potential ground than Indiana as a whole: 100% of its land against 56.6%. Of the 6 counties that border it, none has as large a share of high-potential ground; Darke County, OH comes nearest at 100%.

Share of land by USGS radon potential: Wayne County, the 6 counties bordering it and Indiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Wayne CountyZone 1NoneNone100%
Union CountyZone 1NoneNone100%
Fayette CountyZone 1None7.1%92.9%
Preble County, OHZone 1NoneNone100%
Henry CountyZone 1NoneNone100%
Randolph CountyZone 1NoneNone100%
Darke County, OHZone 1NoneNone100%
Indiana92 counties, pooled by land areaVariesNone43.4%56.6%

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

Local help

Wayne County, Local resources

Radon testing and mitigation in Wayne County

What Indiana's program says
Phone
1-800-272-9723
Licensing of radon professionals
According to the Indiana Radon Rule, 410 IAC 5.1, everyone who is serving Indiana by doing radon testing, analysis and mitigation (radon reduction) in residential structures must be certified by the Indiana State Department of Health.

What it means

Wayne County, Questions

Questions about radon in Wayne County

Are radon levels high in Wayne County?

Over the 2008 to 2017 laboratory totals, 56.4% of the radon tests reported to CDC for Wayne County, Indiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.5 pCi/L. Of 69 Indiana counties with 30 or more tests for the same period, 8 reported a higher share; pooled, the state comes to 38.9%.

Which counties border Wayne County?

Wayne County borders 6 counties: Union County, IN, Fayette County, IN, Preble County, OH, Henry County, IN, Randolph County, IN and Darke County, OH.

Products

Wayne County, Products

Testing a home in Wayne County

In Wayne County, 56.4% of 140 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 38.9% pooled across Indiana. In Zone 1 the year-round level in Wayne 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

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

Explore

Wayne County, Bordering counties

Counties bordering Wayne County

Calculated by Radon411

Wayne County, Cities and towns

Cities and towns in Wayne County

About 66,169 people live in Wayne County by the Census Bureau's estimate for July 1, 2025, 348 fewer than in 2020 (−0.5%). That works out to 165 people per square mile of land. Richmond alone is home to 35,376 of them, 53.5% of the total. Together its 14 incorporated places hold 67.6% of those residents; the other 32.4% live outside any of them. Reported testing is thin here: 140 tests over 2008 to 2017, or 2.1 for every 1,000 residents (2025 estimate), where Indiana as a whole comes to 6.2.

From Richmond to Whitewater, CDC publishes no figure by town: each reads Wayne County's.

The 12 largest cities and towns in Wayne County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Richmond35,376−1.0%53.5%
Centerville2,742−0.5%4.1%
Cambridge City1,730−1.3%2.6%
Hagerstown1,673−0.9%2.5%
Fountain City697−1.0%1.1%
Dublin677−1.0%1.0%
Milton441+0.2%0.7%
Greens Fork335+1.2%0.5%
Spring Grove335+0.3%0.5%
East Germantown258−1.5%0.4%
Boston149+0.7%0.2%
Economy146+0.7%0.2%
  • Mount Auburn
  • Whitewater

14 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).

Wayne County, Homes

Homes in Wayne County

Wayne County is a place of houses on their own lots: 79% of its 30,758 homes are detached single-family houses, against 73% across Indiana. The homes are older than Indiana's as a whole: half were built before 1960 (1976 for Indiana), and 50% date from before 1960. 70% of occupied homes are lived in by their owner (Indiana: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Wayne County, Indiana, 2019 to 2023
HomesWayne CountyIndiana
Housing units30,7582,953,344
Detached houses79%73%
In buildings of 5 or more8%13%
Mobile homes3%4%
Built before 196050%32%
Built since 20009%21%
Middle year built19601976
Owner-occupied70%70%

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