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Radon Levels in Clinton County, Michigan

EPA puts Clinton County in Zone 2, its middle radon zone, and 38.5% of its 2,313 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

    38.5%

    11.6 pts above MI

    Clinton
    38.5%
    Michigan
    26.9%

    2,313 tests, 2008 to 2017

  • Median result

    3.1pCi/L

    Below action level

    Clinton
    3.1 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    2,313

    13th of 82 by tests

    Clinton
    2,313
    Oakland
    16,224

    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 Michigan

    8 of 82

    Top quarter

    Clinton
    38.5%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Clinton County

Starts at Clinton County's median, 3.1 pCi/L

3.1pCi/L

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

EPA’s reading of 3.1 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. Clinton County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Clinton County, At a glance

Clinton County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

Clinton 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 94% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Clinton County, 2008 to 2017, laboratory

Reported results by concentration band, Clinton County, 2008 to 2017, laboratory
Under 2 pCi/L: 31%2 to 4 pCi/L: 30%4 pCi/L and above: 39%

Of 2,313 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Clinton County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L72231.2%
2 to 4 pCi/L70130.3%
4 pCi/L and above89038.5%
What these figures count

These are the 2,313 tests reported to CDC for Clinton 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

Clinton County, Compared

Clinton County radon figures, compared

Calculated by Radon411

In Clinton County, about 4 in 10 reported tests over the 2008 to 2017 laboratory totals (890 of 2,313) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 2.8 points higher. Across 83 Michigan counties pooled together, 26.9% of tests reached that level, so Clinton County runs 11.6 points above its state.

Of 6 neighbours with a figure, none reported a larger share at or above 4 pCi/L; the spread is 16.8% (Gratiot County) to 36.8% (Ionia County). By share, Clinton County is 8th of 82 Michigan counties with 30 or more tests for the same period.

Half the tests came in under 3.1 pCi/L and half over it; the single highest reached 85.0 pCi/L. Below the action level, 722 tests (31.2%) came in under 2 pCi/L, against 46.4% statewide, and 701 tests (30.3%) fell between 2 and 4, against 26.7% statewide.

Zone 2 on EPA's map (predicted average between 2 and 4 pCi/L) and a 38.5% share point the same way here. USGS geology rates 94% of the county's land moderate radon potential. CDC also counts 214 tests taken after mitigation in Clinton County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Clinton County went from 2,223 tests (2005 to 2014) to 2,313 (2008 to 2017), the share going from 37.9% to 38.5%.

Clinton County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Clinton County
Clinton County2,31338.5%3.1 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled−11.6 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−2.8 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+18.2 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−35.3 points
Ionia County, MIborders it1,39136.8%2.9 pCi/L−1.7 points
Eaton County, MIborders it3,41134.4%2.8 pCi/L−4.1 points
Shiawassee County, MIborders it1,51531.6%2.5 pCi/L−6.9 points
Ingham County, MIborders it2,93224.9%2.2 pCi/L−13.6 points
Montcalm County, MIborders it55023.6%2.1 pCi/L−14.9 points
Gratiot County, MIborders it45716.8%1.7 pCi/L−21.7 points
Where Clinton County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultClinton County testsClinton County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L72231.2%46.4%39.6%−15.2 points
2 to 4 pCi/L70130.3%26.7%24.7%+3.6 points
4 pCi/L and above89038.5%26.9%35.7%+11.6 points
Clinton County ranked among the 82 Michigan counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Hillsdale County3 of 822,08654.8%4.4 pCi/L
Jackson County4 of 822,96449.7%3.9 pCi/L
Livingston County5 of 824,88543.1%3.4 pCi/L
Washtenaw County6 of 828,50041.3%3.2 pCi/L
Dickinson County7 of 8284339.3%3.1 pCi/L
Clinton County8 of 822,31338.5%3.1 pCi/L
Otsego County9 of 821,08038.2%3.2 pCi/L
Ionia County10 of 821,39136.8%2.9 pCi/L
Calhoun County11 of 821,64936.4%3.0 pCi/L
Iron County12 of 8226536.2%2.6 pCi/L
Tuscola County13 of 8236935.5%2.6 pCi/L
Clinton County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 20172,31338.5%3.1 pCi/L85.0 pCi/L26.9%+0.8 points
2007 to 20162,25637.7%3.0 pCi/L92.7 pCi/L26.8%−0.5 points
2006 to 20152,30138.2%3.0 pCi/L92.7 pCi/L26.8%+0.3 points
2005 to 20142,22337.9%3.0 pCi/L92.7 pCi/L26.2%First on file

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

Clinton County, State data

Michigan's own radon test data

Measured

What Michigan's own agencies publish about radon tests in Clinton County, with their period. These are not CDC's figures and are never added to them.

MeasuredState figures, not CDC's

What Michigan EGLE reports for the ZIP codes in Clinton County

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 17 ZIP codes that lie wholly or partly in Clinton County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Clinton County
ZIP codeWhat the state reports
4880827% greater than 4 pCi/L, median 2.8 pCi/L, 37 tests
4882040% greater than 4 pCi/L, median 3.1 pCi/L, 186 tests
4882240% greater than 4 pCi/L, median 2.7 pCi/L, 43 tests
4882318% greater than 4 pCi/L, median 1.7 pCi/L, 195 tests
4883149% greater than 4 pCi/L, median 3.6 pCi/L, 35 tests
4883538% greater than 4 pCi/L, median 3.4 pCi/L, 53 tests
4883727% greater than 4 pCi/L, median 2.6 pCi/L, 286 tests
4884022% greater than 4 pCi/L, median 2.1 pCi/L, 91 tests
488450% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests
4884837% greater than 4 pCi/L, median 2.7 pCi/L, 81 tests
488532 tests, figures not shown
4886647% greater than 4 pCi/L, median 3.9 pCi/L, 36 tests
4887347% greater than 4 pCi/L, median 3.2 pCi/L, 17 tests
4887545% greater than 4 pCi/L, median 3.5 pCi/L, 123 tests
4887935% greater than 4 pCi/L, median 3.0 pCi/L, 241 tests
4889439% greater than 4 pCi/L, median 3.1 pCi/L, 44 tests
4890617% greater than 4 pCi/L, median 1.5 pCi/L, 163 tests
  • EGLE's figures cover first-time tests only, from organizations willing to provide data.
  • EGLE does not publish figures for a ZIP code with fewer than 5 test results.
  • EGLE says the map is not intended to decide whether a home should be tested: all homes should be tested.
  • ZIP code boundaries are postal delivery areas, not legal or administrative boundaries.
  • A ZIP code that crosses the county line is listed whole; its figures cover all of it.

Measured: Michigan EGLE data, About 10 years to 2026-05-15.

Clinton County, Geology

The ground under Clinton County

Predicted

Most of the ground under Clinton County is one class on USGS's geologic map: 94.0% of its land is moderate radon potential, with 6.0% low. The map puts 94.0% of Clinton County in the area it calls South-Central Michigan Basin and 6.0% in Glacial Lakes. USGS gives the first a radon index of 10, in the moderate band (9 to 11), and the second 7, in the low band (5 to 8).

USGS's geologic areas under Clinton County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
South-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Moderate1094.0%
Glacial LakesSilt and clay glacial lake deposits.Low76.0%

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

Clinton County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Clinton County's is. Of the 6 counties that border it, 4 have more moderate-potential ground, Eaton County the most at 100%.

Share of land by USGS radon potential: Clinton County, the 6 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Clinton CountyZone 26.0%94.0%None
Gratiot CountyZone 357.9%42.1%None
Shiawassee CountyZone 224.1%75.9%None
Ionia CountyZone 2None100%None
Ingham CountyZone 2None100%None
Eaton CountyZone 2None100%None
Montcalm CountyZone 22.6%97.4%None
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Clinton County, Local resources

Radon testing and mitigation in Clinton County

Listed radon businesses with an address in Clinton County:

Listed radon professionals by town: Lansing, DeWitt

What Michigan's program says
Phone
800-723-6642
Email
Radon@Michigan.gov
Licensing of radon professionals
Michigan does not license or regulate radon testing and mitigation contractors.

What it means

Clinton County, Questions

Questions about radon in Clinton County

Are radon levels high in Clinton County?

Over the 2008 to 2017 laboratory totals, 38.5% of the radon tests reported to CDC for Clinton County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 3.1 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 7 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Clinton County?

Clinton County borders 6 counties: Gratiot County, Shiawassee County, Ionia County, Ingham County, Eaton County and Montcalm County.

Products

Clinton County, Products

Testing a home in Clinton County

In Clinton County, 38.5% of 2,313 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. In Zone 2 a short-term kit (2 to 90 days) is the quick first check in Clinton County; a long-term test tells the year-round average.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Clinton County homes, compared

Explore

Clinton County, Bordering counties

Counties bordering Clinton County

Calculated by Radon411

Clinton County, Cities and towns

Cities and towns in Clinton County

The Census Bureau estimates 80,432 residents in Clinton County for July 1, 2025, 1,264 more than in 2020 (+1.6%). That works out to 142 people per square mile of land. Lansing, the largest place on its list (113,884 residents in all), extends beyond Clinton County, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 2,313 reported tests for 2008 to 2017 come to 28.8 for every 1,000 residents (2025 estimate), against 11.3 for Michigan.

From Lansing to Eagle, CDC publishes no figure by town: each reads Clinton County's.

The cities and towns in Clinton County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Lansingextends beyond Clinton County113,884+1.2%Counted whole
East Lansingextends beyond Clinton County49,355+2.8%Counted whole
Grand Ledgeextends beyond Clinton County7,853+0.7%Counted whole
St. Johns7,780+0.7%9.7%
DeWitt4,795+0.3%6.0%
Ovid1,498+1.0%1.9%
Fowler1,237+0.3%1.5%
Elsie950+0.7%1.2%
Westphalia947+0.7%1.2%
Maple Rapids588+1.2%0.7%
Hubbardstonextends beyond Clinton County342+0.9%Counted whole
Eagle107+0.9%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 Clinton County is counted whole, so it has no share.

Clinton County, Homes

Homes in Clinton County

Clinton County is a place of houses on their own lots: 78% of its 33,123 homes are detached single-family houses, against 72% across Michigan. Much of Clinton County is recent building: 27% of its homes have gone up since 2000 and the middle year built is 1981, against 1972 for Michigan. Owners live in 83% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Clinton County, Michigan, 2019 to 2023
HomesClinton CountyMichigan
Housing units33,1234,599,683
Detached houses78%72%
In buildings of 5 or more10%13%
Mobile homes6%5%
Built before 196027%36%
Built since 200027%15%
Middle year built19811972
Owner-occupied83%73%

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