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Radon Levels in Wayne County, Michigan

EPA puts Wayne County in Zone 3, its lowest radon zone, and 17.5% of its 5,594 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

    17.5%

    9.4 pts below MI

    Wayne
    17.5%
    Michigan
    26.9%

    5,594 tests, 2008 to 2017

  • Median result

    1.8pCi/L

    Below action level

    Wayne
    1.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    5,594

    5th of 82 by tests

    Wayne
    5,594
    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

    38 of 82

    Middle half

    Wayne
    17.5%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Wayne County

Starts at Wayne County's median, 1.8 pCi/L

1.8pCi/L

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

EPA’s reading of 1.8 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. Wayne County's median reported result, 2008 to 2017.

Interpret this reading

The data

Wayne County, At a glance

Wayne County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Wayne 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 87% 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: 55%2 to 4 pCi/L: 28%4 pCi/L and above: 17%

Of 5,594 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/L3,06454.8%
2 to 4 pCi/L1,55127.7%
4 pCi/L and above97917.5%
What these figures count

These are the 5,594 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

Wayne County's 5,594 reported tests over the 2008 to 2017 laboratory totals had a middle value of 1.8 pCi/L and a maximum of 50.7 pCi/L, and 17.5% reached 4 pCi/L. Michigan as a whole (83 Michigan counties, pooled) comes to 26.9%: 9.4 points higher than here.

Among its state's counties it ranks 38th of 82 Michigan counties with 30 or more tests for the same period. Statewide for the same period, Lenawee County reported the highest share (56.7%) and Muskegon County the lowest (3.2%).

Below the action level, 3,064 tests (54.8%) came in under 2 pCi/L, against 46.4% statewide, and 1,551 tests (27.7%) fell between 2 and 4, against 26.7% statewide. CDC's ten-year totals for Wayne County went from 4,467 tests (2005 to 2014) to 5,594 (2008 to 2017), the share going from 17.3% to 17.5%.

EPA's 1993 zone map puts Wayne County in Zone 3, a predicted county average under 2 pCi/L. USGS geology rates 87% of the county's land moderate radon potential.

Next door, the shares run from 13.4% in Macomb County to 41.3% in Washtenaw County, with Macomb County below Wayne County.

CDC also counts 363 tests taken after mitigation in Wayne County for the same period: tests in homes where a fix was already in.

Wayne County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Wayne County
Wayne County5,59417.5%1.8 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+9.4 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+18.2 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+39.2 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−14.3 points
Washtenaw County, MIborders it8,50041.3%3.2 pCi/L+23.8 points
Monroe County, MIborders it1,37530.4%2.5 pCi/L+12.9 points
Oakland County, MIborders it16,22428.8%2.3 pCi/L+11.3 points
Macomb County, MIborders it5,62913.4%1.6 pCi/L−4.1 points
Where Wayne County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultWayne County testsWayne County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L3,06454.8%46.4%39.6%+8.4 points
2 to 4 pCi/L1,55127.7%26.7%24.7%+1.0 points
4 pCi/L and above97917.5%26.9%35.7%−9.4 points
Wayne 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
Alcona County33 of 8218520.5%1.7 pCi/L
Mackinac County34 of 829119.8%1.2 pCi/L
Oscoda County35 of 825418.5%2.1 pCi/L
Allegan County36 of 8276618.4%1.7 pCi/L
Van Buren County37 of 8239418.0%1.9 pCi/L
Wayne County38 of 825,59417.5%1.8 pCi/L
Saginaw County39 of 823,03717.0%1.7 pCi/L
Ottawa County40 of 822,54616.8%1.6 pCi/L
Gratiot County41 of 8245716.8%1.7 pCi/L
Sanilac County42 of 8232516.6%1.6 pCi/L
Kent County43 of 828,44916.5%1.8 pCi/L
Wayne County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 20175,59417.5%1.8 pCi/L50.7 pCi/L26.9%−0.3 points
2007 to 20165,29317.8%1.8 pCi/L50.7 pCi/L26.8%+0.1 points
2006 to 20154,79217.7%1.7 pCi/L50.7 pCi/L26.8%+0.4 points
2005 to 20144,46717.3%1.7 pCi/L50.7 pCi/L26.2%First on file

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

Wayne County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 64 ZIP codes that lie wholly or partly in Wayne County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Wayne County
ZIP codeWhat the state reports
4810128% greater than 4 pCi/L, median 2.6 pCi/L, 32 tests
4811119% greater than 4 pCi/L, median 1.8 pCi/L, 95 tests
4811730% greater than 4 pCi/L, median 1.9 pCi/L, 53 tests
481220% greater than 4 pCi/L, median 0.9 pCi/L, 6 tests
4812416% greater than 4 pCi/L, median 1.3 pCi/L, 43 tests
4812510% greater than 4 pCi/L, median 1.1 pCi/L, 10 tests
4812618% greater than 4 pCi/L, median 2.0 pCi/L, 28 tests
4812710% greater than 4 pCi/L, median 1.4 pCi/L, 21 tests
481288% greater than 4 pCi/L, median 1.1 pCi/L, 12 tests
4813411% greater than 4 pCi/L, median 1.3 pCi/L, 46 tests
481356% greater than 4 pCi/L, median 1.4 pCi/L, 16 tests
4813827% greater than 4 pCi/L, median 2.3 pCi/L, 41 tests
481419% greater than 4 pCi/L, median 0.9 pCi/L, 11 tests
481467% greater than 4 pCi/L, median 2.4 pCi/L, 15 tests
4815013% greater than 4 pCi/L, median 1.4 pCi/L, 70 tests
481525% greater than 4 pCi/L, median 1.6 pCi/L, 74 tests
481548% greater than 4 pCi/L, median 1.5 pCi/L, 79 tests
4816414% greater than 4 pCi/L, median 2.0 pCi/L, 14 tests
4816739% greater than 4 pCi/L, median 3.1 pCi/L, 182 tests
4816829% greater than 4 pCi/L, median 2.2 pCi/L, 159 tests
4817023% greater than 4 pCi/L, median 2.3 pCi/L, 203 tests
4817322% greater than 4 pCi/L, median 1.4 pCi/L, 9 tests
481749% greater than 4 pCi/L, median 1.3 pCi/L, 23 tests
481808% greater than 4 pCi/L, median 0.9 pCi/L, 36 tests
4818318% greater than 4 pCi/L, median 2.1 pCi/L, 51 tests
4818413% greater than 4 pCi/L, median 2.5 pCi/L, 8 tests
481855% greater than 4 pCi/L, median 1.9 pCi/L, 40 tests
481860% greater than 4 pCi/L, median 1.4 pCi/L, 21 tests
4818715% greater than 4 pCi/L, median 1.7 pCi/L, 169 tests
4818811% greater than 4 pCi/L, median 1.5 pCi/L, 188 tests
4819210% greater than 4 pCi/L, median 1.9 pCi/L, 20 tests
481938% greater than 4 pCi/L, median 1.2 pCi/L, 13 tests
481950% greater than 4 pCi/L, median 1.5 pCi/L, 15 tests
482010% greater than 4 pCi/L, median 0.3 pCi/L, 13 tests
482020% greater than 4 pCi/L, median 1.0 pCi/L, 19 tests
482030% greater than 4 pCi/L, median 0.7 pCi/L, 8 tests
482040% greater than 4 pCi/L, median 0.7 pCi/L, 8 tests
482050% greater than 4 pCi/L, median 0.9 pCi/L, 11 tests
482060% greater than 4 pCi/L, median 0.8 pCi/L, 10 tests
482072% greater than 4 pCi/L, median 0.3 pCi/L, 45 tests
482083 tests, figures not shown
482110% greater than 4 pCi/L, median 0.3 pCi/L, 8 tests
482120% greater than 4 pCi/L, median 0.3 pCi/L, 15 tests
482130% greater than 4 pCi/L, median 1.2 pCi/L, 9 tests
482145% greater than 4 pCi/L, median 0.7 pCi/L, 21 tests
482150% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests
482164 tests, figures not shown
482172 tests, figures not shown
482193% greater than 4 pCi/L, median 1.0 pCi/L, 32 tests
482210% greater than 4 pCi/L, median 0.3 pCi/L, 40 tests
482230% greater than 4 pCi/L, median 1.1 pCi/L, 30 tests
4822411% greater than 4 pCi/L, median 1.0 pCi/L, 35 tests
4822511% greater than 4 pCi/L, median 1.8 pCi/L, 18 tests
482262 tests, figures not shown
482274% greater than 4 pCi/L, median 0.8 pCi/L, 23 tests
4822817% greater than 4 pCi/L, median 1.8 pCi/L, 24 tests
482292 tests, figures not shown
482308% greater than 4 pCi/L, median 1.3 pCi/L, 24 tests
482340% greater than 4 pCi/L, median 0.3 pCi/L, 17 tests
482350% greater than 4 pCi/L, median 0.7 pCi/L, 30 tests
4823614% greater than 4 pCi/L, median 1.8 pCi/L, 57 tests
482380% greater than 4 pCi/L, median 0.3 pCi/L, 12 tests
482397% greater than 4 pCi/L, median 1.0 pCi/L, 27 tests
482400% greater than 4 pCi/L, median 1.3 pCi/L, 18 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.

Wayne County, Geology

The ground under Wayne County

Predicted

Most of the ground under Wayne County is one class on USGS's geologic map: 87.1% of its land is moderate radon potential, with 8.3% high. The map puts 87.1% of Wayne County in the area it calls Antrim Shale-Lake deposits and 8.3% in Saginaw Lobe Moraine Area. USGS gives the first a radon index of 9, in the moderate band (9 to 11), and the second 12, in the high band (12 to 17).

USGS's geologic areas under Wayne County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Antrim Shale-Lake depositsAntrim black shale covered by glacial lake deposits.Moderate987.1%
Saginaw Lobe Moraine AreaGlacial deposits derived from Sandstone and shale.High128.3%

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

On high-potential ground Wayne County is close to Michigan as a whole: 8.3% of its land against 9.6%. Of the 4 counties that border it, 2 have more high-potential ground, Washtenaw County the most at 84.9%.

Share of land by USGS radon potential: Wayne County, the 4 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Wayne CountyZone 3None87.1%8.3%
Oakland CountyZone 2None56.8%43.2%
Monroe CountyZone 2None98.3%None
Washtenaw CountyZone 1None15.1%84.9%
Macomb CountyZone 3None99.8%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

Wayne County, Local resources

Radon testing and mitigation in Wayne County

Listed radon businesses with an address in Wayne County:

Listed radon professionals by town: Livonia, Romulus, Plymouth, Northville

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

Wayne County, Questions

Questions about radon in Wayne County

Are radon levels high in Wayne County?

Over the 2008 to 2017 laboratory totals, 17.5% of the radon tests reported to CDC for Wayne County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.8 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 37 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Wayne County?

Wayne County borders 4 counties: Oakland County, Monroe County, Washtenaw County and Macomb County.

Products

Wayne County, Products

Testing a home in Wayne County

In Wayne County, 17.5% of 5,594 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 Wayne County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Wayne County homes, compared

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Wayne County, Bordering counties

Counties bordering Wayne County

Calculated by Radon411

Wayne County, Cities and towns

Cities and towns in Wayne County

About 1,769,038 people live in Wayne County by the Census Bureau's estimate for July 1, 2025, 20,596 fewer than in 2020 (−1.2%). Packed into its land, that is 2,891 people per square mile. Its largest town, Detroit, has 649,095 residents, 36.7% of the total. Reported testing is thin here: 5,594 tests over 2008 to 2017, or 3.2 for every 1,000 residents (2025 estimate), where Michigan as a whole comes to 11.3.

From Detroit to Village of Grosse Pointe Shores, 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
Detroit649,095+1.7%36.7%
Dearborn105,611−3.6%6.0%
Livonia92,603−2.9%5.2%
Westland82,333−3.3%4.7%
Taylor61,279−3.0%3.5%
Dearborn Heights60,664−3.8%3.4%
Lincoln Park38,529−3.9%2.2%
Southgate28,931−3.3%1.6%
Allen Park27,445−3.8%1.6%
Hamtramck27,261−3.8%1.5%
Garden City26,280−3.7%1.5%
Inkster24,959−3.9%1.4%
  • Romulus
  • Wyandotte
  • Trenton
  • Wayne
  • Grosse Pointe Woods
  • Harper Woods
  • Woodhaven
  • Melvindale
  • Riverview
  • Grosse Pointe Park
  • Flat Rock (part)
  • Grosse Pointe Farms
  • Plymouth
  • Ecorse
  • Highland Park
  • River Rouge
  • Northville (part)
  • Grosse Pointe
  • Gibraltar
  • Belleville
  • Rockwood
  • Village of Grosse Pointe Shores (part)

34 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).

Wayne County, Homes

Homes in Wayne County

Of Wayne County's 796,119 homes, 70% are detached houses, against 72% across Michigan; 16% are in buildings of five or more homes. The homes are older than Michigan's as a whole: half were built before 1956 (1972 for Michigan), and 59% date from before 1960. 64% 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 Wayne County, Michigan, 2019 to 2023
HomesWayne CountyMichigan
Housing units796,1194,599,683
Detached houses70%72%
In buildings of 5 or more16%13%
Mobile homes2%5%
Built before 196059%36%
Built since 20008%15%
Middle year built19561972
Owner-occupied64%73%

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