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Radon Levels in Macomb County, Michigan

EPA puts Macomb County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 13.4% of 5,629 (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

    13.4%

    13.5 pts below MI

    Macomb
    13.4%
    Michigan
    26.9%

    5,629 tests, 2008 to 2017

  • Median result

    1.6pCi/L

    Below action level

    Macomb
    1.6 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    5,629

    4th of 82 by tests

    Macomb
    5,629
    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

    56 of 82

    Middle half

    Macomb
    13.4%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Macomb County

Starts at Macomb 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. Macomb County's median reported result, 2008 to 2017.

Interpret this reading

The data

Macomb County, At a glance

Macomb County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Macomb 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: Moderate across 100% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Macomb County, 2008 to 2017, laboratory
Under 2 pCi/L: 61%2 to 4 pCi/L: 26%4 pCi/L and above: 13%

Of 5,629 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Macomb County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L3,40960.6%
2 to 4 pCi/L1,46626.0%
4 pCi/L and above75413.4%
What these figures count

These are the 5,629 tests reported to CDC for Macomb 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

Macomb County, Compared

Macomb County radon figures, compared

Calculated by Radon411

Macomb County reports fewer high tests than Michigan overall. 13.4% of its 5,629 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 13.5 points below the 26.9% pooled from 83 Michigan counties.

Ordered from highest share down, it comes 56th 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%; Macomb County sits 22.3 points below it.

Next door, the shares run from 13.7% in St. Clair County to 33.4% in Lapeer County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 13.4% share point the same way here.

Half the tests came in under 1.6 pCi/L and half over it; the single highest reached 34.3 pCi/L. The rest split 60.6% under 2 pCi/L and 26.0% from 2 to 4 (Michigan: 46.4% and 26.7%).

CDC's ten-year totals for Macomb County went from 4,786 tests (2005 to 2014) to 5,629 (2008 to 2017), the share going from 12.2% to 13.4%.

Macomb County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Macomb County
Macomb County5,62913.4%1.6 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+13.5 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+22.3 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+43.3 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−10.2 points
Lapeer County, MIborders it64933.4%2.7 pCi/L+20.0 points
Oakland County, MIborders it16,22428.8%2.3 pCi/L+15.4 points
Wayne County, MIborders it5,59417.5%1.8 pCi/L+4.1 points
St. Clair County, MIborders it64113.7%1.5 pCi/L+0.3 points
Where Macomb County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultMacomb County testsMacomb County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L3,40960.6%46.4%39.6%+14.2 points
2 to 4 pCi/L1,46626.0%26.7%24.7%−0.7 points
4 pCi/L and above75413.4%26.9%35.7%−13.5 points
Macomb 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
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
Roscommon County60 of 8216612.7%1.0 pCi/L
Antrim County61 of 8234312.0%1.5 pCi/L
Macomb County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 20175,62913.4%1.6 pCi/L34.3 pCi/L26.9%Level
2007 to 20165,46613.4%1.5 pCi/L34.3 pCi/L26.8%−0.1 points
2006 to 20154,75513.5%1.5 pCi/L34.3 pCi/L26.8%+1.3 points
2005 to 20144,78612.2%1.5 pCi/L34.3 pCi/L26.2%First on file

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

Macomb County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 39 ZIP codes that lie wholly or partly in Macomb County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Macomb County
ZIP codeWhat the state reports
4800543% greater than 4 pCi/L, median 2.7 pCi/L, 35 tests
480150% greater than 4 pCi/L, median 0.8 pCi/L, 22 tests
480216% greater than 4 pCi/L, median 1.1 pCi/L, 52 tests
480266% greater than 4 pCi/L, median 1.1 pCi/L, 50 tests
480356% greater than 4 pCi/L, median 1.4 pCi/L, 116 tests
4803612% greater than 4 pCi/L, median 1.4 pCi/L, 100 tests
4803821% greater than 4 pCi/L, median 2.2 pCi/L, 253 tests
4804131% greater than 4 pCi/L, median 2.8 pCi/L, 13 tests
480426% greater than 4 pCi/L, median 1.4 pCi/L, 299 tests
4804310% greater than 4 pCi/L, median 1.2 pCi/L, 71 tests
480447% greater than 4 pCi/L, median 1.5 pCi/L, 354 tests
480455% greater than 4 pCi/L, median 1.1 pCi/L, 134 tests
480478% greater than 4 pCi/L, median 1.4 pCi/L, 190 tests
4804817% greater than 4 pCi/L, median 1.3 pCi/L, 23 tests
480500% greater than 4 pCi/L, median 1.4 pCi/L, 10 tests
480516% greater than 4 pCi/L, median 1.4 pCi/L, 69 tests
4806210% greater than 4 pCi/L, median 1.6 pCi/L, 31 tests
4806550% greater than 4 pCi/L, median 4.0 pCi/L, 103 tests
480660% greater than 4 pCi/L, median 1.2 pCi/L, 55 tests
480806% greater than 4 pCi/L, median 1.2 pCi/L, 70 tests
480812% greater than 4 pCi/L, median 1.3 pCi/L, 93 tests
480823% greater than 4 pCi/L, median 1.1 pCi/L, 64 tests
480882% greater than 4 pCi/L, median 1.6 pCi/L, 89 tests
480892% greater than 4 pCi/L, median 0.9 pCi/L, 55 tests
480910% greater than 4 pCi/L, median 0.8 pCi/L, 50 tests
480920% greater than 4 pCi/L, median 1.1 pCi/L, 95 tests
480933% greater than 4 pCi/L, median 1.3 pCi/L, 111 tests
4809424% greater than 4 pCi/L, median 2.2 pCi/L, 143 tests
4809562% greater than 4 pCi/L, median 4.8 pCi/L, 66 tests
4809614% greater than 4 pCi/L, median 2.3 pCi/L, 29 tests
4823614% greater than 4 pCi/L, median 1.8 pCi/L, 57 tests
4830622% greater than 4 pCi/L, median 2.1 pCi/L, 331 tests
483107% greater than 4 pCi/L, median 1.4 pCi/L, 129 tests
483128% greater than 4 pCi/L, median 1.5 pCi/L, 141 tests
483134% greater than 4 pCi/L, median 1.4 pCi/L, 142 tests
483149% greater than 4 pCi/L, median 1.5 pCi/L, 55 tests
4831510% greater than 4 pCi/L, median 1.6 pCi/L, 169 tests
4831615% greater than 4 pCi/L, median 2.1 pCi/L, 158 tests
4831723% greater than 4 pCi/L, median 2.1 pCi/L, 105 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.

Macomb County, Geology

The ground under Macomb County

Predicted

USGS's geologic map puts all of Macomb County's mapped land in one class: moderate radon potential. The map puts 71.5% of Macomb County in the area it calls Antrim Shale-Lake deposits and 28.3% in South-Central Michigan Basin. USGS gives the first a radon index of 9 and the second 10, both in the moderate band (9 to 11).

USGS's geologic areas under Macomb County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Antrim Shale-Lake depositsAntrim black shale covered by glacial lake deposits.Moderate971.5%
South-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Moderate1028.3%

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

Macomb County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Macomb County's is. Of the 4 counties that border it, 2 have more high-potential ground, Oakland County the most at 43.2%.

Share of land by USGS radon potential: Macomb County, the 4 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Macomb CountyZone 3None99.8%None
St. Clair CountyZone 3None94.6%None
Oakland CountyZone 2None56.8%43.2%
Lapeer CountyZone 2None100%None
Wayne CountyZone 3None87.1%8.3%
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Macomb County, Local resources

Radon testing and mitigation in Macomb County

Listed radon businesses with an address in Macomb County:

Listed radon professionals by town: Fraser

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

Macomb County, Questions

Questions about radon in Macomb County

Are radon levels high in Macomb County?

Over the 2008 to 2017 laboratory totals, 13.4% of the radon tests reported to CDC for Macomb 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, 55 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Macomb County?

Macomb County borders 4 counties: St. Clair County, Oakland County, Lapeer County and Wayne County.

Products

Macomb County, Products

Testing a home in Macomb County

In Macomb County, 13.4% of 5,629 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 Macomb County.

Test kits and monitors3

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Best radon monitors for Macomb County homes, compared

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Macomb County, Bordering counties

Counties bordering Macomb County

Calculated by Radon411

Macomb County, Cities and towns

Cities and towns in Macomb County

The Census Bureau estimates 886,221 residents in Macomb County for July 1, 2025, 5,981 more than in 2020 (+0.7%). Packed into its land, that is 1,849 people per square mile. No town dominates: Warren, the largest, has 137,138 residents, 15.5% of the total. Reported testing is thin here: 5,629 tests over 2008 to 2017, or 6.4 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.

From Warren to Memphis, CDC publishes no figure by town: each reads Macomb County's.

The 12 largest cities and towns in Macomb County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Warren137,138−1.5%15.5%
Sterling Heights133,931−0.1%15.1%
St. Clair Shores57,872−1.5%6.5%
Roseville46,863−1.6%5.3%
Eastpointe33,814−1.3%3.8%
Mount Clemens15,419−1.6%1.7%
Fraser14,496−1.4%1.6%
New Baltimore12,123+0.2%1.4%
Center Line8,503−0.3%1.0%
New Haven6,749+10.2%0.8%
Richmondextends beyond Macomb County5,927+1.0%Counted whole
Utica5,114−2.1%0.6%
  • Romeo
  • Village of Grosse Pointe Shores (part)
  • Armada
  • Memphis (part)

16 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Macomb County is counted whole, so it has no share.

Macomb County, Homes

Homes in Macomb County

Of Macomb County's 371,723 homes, 69% are detached houses, against 72% across Michigan; 14% are in buildings of five or more homes. Half of its homes were built before 1975, close to Michigan's 1972: 25% date from before 1960 and 17% from 2000 or later. 75% of occupied homes are lived in by their owner (Michigan: 73%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Macomb County, Michigan, 2019 to 2023
HomesMacomb CountyMichigan
Housing units371,7234,599,683
Detached houses69%72%
In buildings of 5 or more14%13%
Mobile homes4%5%
Built before 196025%36%
Built since 200017%15%
Middle year built19751972
Owner-occupied75%73%

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