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Radon Levels in Clare County, Michigan

EPA puts Clare County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 14.1% of 198 (2008 to 2017, laboratory totals) reached 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

    14.1%

    12.8 pts below MI

    Clare
    14.1%
    Michigan
    26.9%

    198 tests, 2008 to 2017

  • Median result

    1.6pCi/L

    Below action level

    Clare
    1.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    198

    65th of 82 by tests

    Clare
    198
    Oakland
    16,224

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

  • Rank in Michigan

    54 of 82

    Middle half

    Clare
    14.1%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Clare County

Starts at Clare County's median, 1.6 pCi/L

1.6pCi/L

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

EPA’s reading of 1.6 pCi/L

Below 2 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 below 2 pCi/L, the level at which EPA says a fix should be considered. Clare County's median reported result, 2008 to 2017.

Interpret this reading

The data

Clare County, At a glance

Clare County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Clare County as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

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

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Clare County, 2008 to 2017, laboratory
Under 2 pCi/L: 60%2 to 4 pCi/L: 26%4 pCi/L and above: 14%

Of 198 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Clare County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L11960.1%
2 to 4 pCi/L5125.8%
4 pCi/L and above2814.1%
What these figures count

These are the 198 tests reported to CDC for Clare 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

Clare County, Compared

Clare County radon figures, compared

Calculated by Radon411

Clare County reports fewer high tests than Michigan overall. 14.1% of its 198 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 12.8 points below the 26.9% pooled from 83 Michigan counties.

Ordered from highest share down, it comes 54th of 82 Michigan counties with 30 or more tests for the same period. Nationally, every county with a figure for the same period pools to 35.7%; Clare County sits 21.6 points below it.

Next door, the shares run from 5.3% in Midland County to 21.7% in Mecosta County, with Roscommon County, Osceola County and Midland County below Clare County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 14.1% share point the same way here.

Half the tests came in under 1.6 pCi/L and half over it; the single highest reached 18.5 pCi/L. The rest split 60.1% under 2 pCi/L and 25.8% from 2 to 4 (Michigan: 46.4% and 26.7%).

CDC's ten-year totals for Clare County went from 271 tests (2005 to 2014) to 198 (2008 to 2017), the share going from 11.1% to 14.1%.

Clare County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Clare County
Clare County19814.1%1.6 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+12.8 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+21.6 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+42.6 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−10.9 points
Mecosta County, MIborders it61421.7%2.0 pCi/L+7.6 points
Isabella County, MIborders it87016.4%1.6 pCi/L+2.3 points
Gladwin County, MIborders it24715.4%1.3 pCi/L+1.3 points
Missaukee County, MIborders it35014.9%1.6 pCi/L+0.8 points
Roscommon County, MIborders it16612.7%1.0 pCi/L−1.4 points
Osceola County, MIborders it24610.6%1.7 pCi/L−3.5 points
Midland County, MIborders it2,0065.3%1.0 pCi/L−8.8 points
Where Clare County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultClare County testsClare County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L11960.1%46.4%39.6%+13.7 points
2 to 4 pCi/L5125.8%26.7%24.7%−0.9 points
4 pCi/L and above2814.1%26.9%35.7%−12.8 points
Clare 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
Schoolcraft County49 of 826615.2%0.6 pCi/L
Ogemaw County50 of 8212015.0%2.0 pCi/L
Lake County51 of 829414.9%1.4 pCi/L
Missaukee County52 of 8235014.9%1.6 pCi/L
Montmorency County53 of 8219114.7%1.6 pCi/L
Clare County54 of 8219814.1%1.6 pCi/L
St. Clair County55 of 8264113.7%1.5 pCi/L
Macomb County56 of 825,62913.4%1.6 pCi/L
Alpena County57 of 821,13913.3%0.9 pCi/L
Gogebic County58 of 8217112.9%1.2 pCi/L
Kalkaska County59 of 8220412.7%1.3 pCi/L
Clare County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201719814.1%1.6 pCi/L18.5 pCi/L26.9%+0.1 points
2007 to 201620714.0%1.6 pCi/L15.9 pCi/L26.8%−0.2 points
2006 to 201523314.2%1.5 pCi/L16.5 pCi/L26.8%+3.1 points
2005 to 201427111.1%1.4 pCi/L16.5 pCi/L26.2%First on file

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

Clare County, State data

Michigan's own radon test data

Measured

What Michigan's own agencies publish about radon tests in Clare 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 Clare County

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 7 ZIP codes that lie wholly or partly in Clare County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Clare County
ZIP codeWhat the state reports
486129% greater than 4 pCi/L, median 0.3 pCi/L, 35 tests
486170% greater than 4 pCi/L, median 1.5 pCi/L, 29 tests
4862231% greater than 4 pCi/L, median 2.5 pCi/L, 16 tests
4862412% greater than 4 pCi/L, median 1.1 pCi/L, 91 tests
4862519% greater than 4 pCi/L, median 1.8 pCi/L, 32 tests
4863233% greater than 4 pCi/L, median 2.3 pCi/L, 12 tests
4966527% greater than 4 pCi/L, median 2.3 pCi/L, 11 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.

Clare County, Geology

The ground under Clare County

Predicted

USGS's geologic map puts all of Clare County's mapped land in one class: low radon potential. All of it lies in the area the map calls North-Central Michigan Basin, to which USGS gives a radon index of 8, in the low band (5 to 8).

USGS's geologic areas under Clare County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
North-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Low8100%

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

Clare County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Clare County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Isabella County the most at 26.5%.

Share of land by USGS radon potential: Clare County, the 7 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Clare CountyZone 3100%NoneNone
Gladwin CountyZone 3100%NoneNone
Osceola CountyZone 3100%NoneNone
Isabella CountyZone 373.5%26.5%None
Roscommon CountyZone 3100%NoneNone
Missaukee CountyZone 3100%NoneNone
Midland CountyZone 3100%NoneNone
Mecosta CountyZone 379.3%20.7%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

Clare County, Local resources

Radon testing and mitigation in Clare County

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

Clare County, Questions

Questions about radon in Clare County

Are radon levels high in Clare County?

Over the 2008 to 2017 laboratory totals, 14.1% of the radon tests reported to CDC for Clare County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.6 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 53 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Clare County?

Clare County borders 7 counties: Gladwin County, Osceola County, Isabella County, Roscommon County, Missaukee County, Midland County and Mecosta County.

Products

Clare County, Products

Testing a home in Clare County

In Clare County, 14.1% of 198 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Clare County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Clare County homes, compared

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Clare County, Bordering counties

Counties bordering Clare County

Calculated by Radon411

Clare County, Cities and towns

Cities and towns in Clare County

The Census Bureau estimates 31,543 residents in Clare County for July 1, 2025, 706 more than in 2020 (+2.3%). That works out to 56 people per square mile of land. Clare, the largest place on its list (3,318 residents in all), extends beyond Clare County, so no share of the total is worked out for it. Reported testing is thin here: 198 tests over 2008 to 2017, or 6.3 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.

From Clare to Farwell, CDC publishes no figure by town: each reads Clare County's.

The cities and towns in Clare County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Clareextends beyond Clare County3,318+1.1%Counted whole
Harrison2,171+1.0%6.9%
Farwell899+1.7%2.9%

3 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 Clare County is counted whole, so it has no share.

Clare County, Homes

Homes in Clare County

Clare County is a place of houses on their own lots: 78% of its 21,953 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1976, close to Michigan's 1972: 22% date from before 1960 and 13% from 2000 or later. Owners live in 86% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Clare County, Michigan, 2019 to 2023
HomesClare CountyMichigan
Housing units21,9534,599,683
Detached houses78%72%
In buildings of 5 or more3%13%
Mobile homes17%5%
Built before 196022%36%
Built since 200013%15%
Middle year built19761972
Owner-occupied86%73%

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