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Radon Levels in Roscommon County, Michigan

EPA puts Roscommon County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 12.7% of 166 (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

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  • Share at 4+ pCi/L

    12.7%

    14.2 pts below MI

    Roscommon
    12.7%
    Michigan
    26.9%

    166 tests, 2008 to 2017

  • Median result

    1.0pCi/L

    Below action level

    Roscommon
    1.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    166

    71st of 82 by tests

    Roscommon
    166
    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

    60 of 82

    Middle half

    Roscommon
    12.7%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Roscommon County

Starts at Roscommon County's median, 1.0 pCi/L

1.0pCi/L

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

EPA’s reading of 1.0 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. Roscommon County's median reported result, 2008 to 2017.

Interpret this reading

The data

Roscommon County, At a glance

Roscommon County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Roscommon 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 Roscommon County, 2008 to 2017, laboratory

Reported results by concentration band, Roscommon County, 2008 to 2017, laboratory
Under 2 pCi/L: 71%2 to 4 pCi/L: 16%4 pCi/L and above: 13%

Of 166 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Roscommon County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L11971.7%
2 to 4 pCi/L2615.7%
4 pCi/L and above2112.7%
What these figures count

These are the 166 tests reported to CDC for Roscommon 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

Roscommon County, Compared

Roscommon County radon figures, compared

Calculated by Radon411

Roscommon County reports fewer high tests than Michigan overall. 12.7% of its 166 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 14.2 points below the 26.9% pooled from 83 Michigan counties.

Ordered from highest share down, it comes 60th 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%; Roscommon County sits 23.0 points below it.

Next door, the shares run from 6.2% in Crawford County to 18.5% in Oscoda County, with Crawford County below Roscommon County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 12.7% share point the same way here.

Half the tests came in under 1.0 pCi/L and half over it; the single highest reached 13.0 pCi/L. The rest split 71.7% under 2 pCi/L and 15.7% from 2 to 4 (Michigan: 46.4% and 26.7%).

CDC's ten-year totals for Roscommon County went from 281 tests (2005 to 2014) to 166 (2008 to 2017), the share going from 10.0% to 12.7%.

Roscommon County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Roscommon County
Roscommon County16612.7%1.0 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+14.2 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+23.0 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+44.0 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−9.5 points
Oscoda County, MIborders it5418.5%2.1 pCi/L+5.8 points
Gladwin County, MIborders it24715.4%1.3 pCi/L+2.7 points
Ogemaw County, MIborders it12015.0%2.0 pCi/L+2.3 points
Missaukee County, MIborders it35014.9%1.6 pCi/L+2.2 points
Clare County, MIborders it19814.1%1.6 pCi/L+1.4 points
Kalkaska County, MIborders it20412.7%1.3 pCi/LLevel
Crawford County, MIborders it1946.2%1.3 pCi/L−6.5 points
Where Roscommon County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultRoscommon County testsRoscommon County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L11971.7%46.4%39.6%+25.3 points
2 to 4 pCi/L2615.7%26.7%24.7%−11.0 points
4 pCi/L and above2112.7%26.9%35.7%−14.2 points
Roscommon 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
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
Roscommon County60 of 8216612.7%1.0 pCi/L
Antrim County61 of 8234312.0%1.5 pCi/L
Menominee County62 of 8212011.7%1.2 pCi/L
Chippewa County63 of 8231911.6%0.9 pCi/L
Grand Traverse County64 of 821,61411.5%1.4 pCi/L
Ontonagon County65 of 8212311.4%1.3 pCi/L
Roscommon County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201716612.7%1.0 pCi/L13.0 pCi/L26.9%+1.0 points
2007 to 201621311.7%1.1 pCi/L13.0 pCi/L26.8%+0.4 points
2006 to 201521211.3%1.1 pCi/L20.5 pCi/L26.8%+1.3 points
2005 to 201428110.0%1.0 pCi/L20.5 pCi/L26.2%First on file

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

Roscommon County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 5 ZIP codes that lie wholly or partly in Roscommon County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Roscommon County
ZIP codeWhat the state reports
4862412% greater than 4 pCi/L, median 1.1 pCi/L, 91 tests
486290% greater than 4 pCi/L, median 0.7 pCi/L, 13 tests
4865113% greater than 4 pCi/L, median 0.6 pCi/L, 8 tests
486538% greater than 4 pCi/L, median 1.7 pCi/L, 38 tests
486563 tests, figures not shown
  • 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.

Roscommon County, Geology

The ground under Roscommon County

Predicted

USGS's geologic map puts all of Roscommon 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 Roscommon 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.Low899.9%

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

Roscommon County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Roscommon County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Oscoda County the most at 16.5%.

Share of land by USGS radon potential: Roscommon County, the 7 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Roscommon CountyZone 3100%NoneNone
Missaukee CountyZone 3100%NoneNone
Ogemaw CountyZone 3100%NoneNone
Clare CountyZone 3100%NoneNone
Crawford CountyZone 3100%NoneNone
Gladwin CountyZone 3100%NoneNone
Kalkaska CountyZone 394.9%5.1%None
Oscoda CountyZone 383.5%16.5%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

Roscommon County, Local resources

Radon testing and mitigation in Roscommon 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

Roscommon County, Questions

Questions about radon in Roscommon County

Are radon levels high in Roscommon County?

Over the 2008 to 2017 laboratory totals, 12.7% of the radon tests reported to CDC for Roscommon County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 59 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Roscommon County?

Roscommon County borders 7 counties: Missaukee County, Ogemaw County, Clare County, Crawford County, Gladwin County, Kalkaska County and Oscoda County.

Products

Roscommon County, Products

Testing a home in Roscommon County

In Roscommon County, 12.7% of 166 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 Roscommon County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Roscommon County homes, compared

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Roscommon County, Bordering counties

Counties bordering Roscommon County

Calculated by Radon411

Roscommon County, Cities and towns

Cities and towns in Roscommon County

The Census Bureau estimates 23,914 residents in Roscommon County for July 1, 2025, 438 more than in 2020 (+1.9%). That works out to 46 people per square mile of land. Roscommon, its one incorporated place, has 992 residents, 4.1% of the total. Reported testing is thin here: 166 tests over 2008 to 2017, or 6.9 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.

Roscommon is the one incorporated place here; CDC publishes no figure by town, so it reads Roscommon County's.

Roscommon, Roscommon County: residents on July 1, 2025
PlaceResidentsSince 2020Share of residents
Roscommon992+0.9%4.1%

One incorporated place, 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).

Roscommon County, Homes

Homes in Roscommon County

Roscommon County is a place of houses on their own lots: 88% of its 23,170 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1976, close to Michigan's 1972: 18% date from before 1960 and 12% from 2000 or later. Owners live in 84% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Roscommon County, Michigan, 2019 to 2023
HomesRoscommon CountyMichigan
Housing units23,1704,599,683
Detached houses88%72%
In buildings of 5 or more2%13%
Mobile homes9%5%
Built before 196018%36%
Built since 200012%15%
Middle year built19761972
Owner-occupied84%73%

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