Skip to content
RADON411

Locations and reports

Radon Levels in Grand Traverse County, Michigan

EPA puts Grand Traverse County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 11.5% of 1,614 (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

    11.5%

    15.4 pts below MI

    Grand Traverse
    11.5%
    Michigan
    26.9%

    1,614 tests, 2008 to 2017

  • Median result

    1.4pCi/L

    Below action level

    Grand Traverse
    1.4 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,614

    20th of 82 by tests

    Grand Traverse
    1,614
    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

    64 of 82

    Lowest quarter

    Grand Traverse
    11.5%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Grand Traverse County

Starts at Grand Traverse County's median, 1.4 pCi/L

1.4pCi/L

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

EPA’s reading of 1.4 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. Grand Traverse County's median reported result, 2008 to 2017.

Interpret this reading

The data

Grand Traverse County, At a glance

Grand Traverse County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Grand Traverse 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 77% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Grand Traverse County, 2008 to 2017, laboratory

Reported results by concentration band, Grand Traverse County, 2008 to 2017, laboratory
Under 2 pCi/L: 65%2 to 4 pCi/L: 24%4 pCi/L and above: 11%

Of 1,614 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Grand Traverse County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1,04464.7%
2 to 4 pCi/L38423.8%
4 pCi/L and above18611.5%
What these figures count

These are the 1,614 tests reported to CDC for Grand Traverse 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

Grand Traverse County, Compared

Grand Traverse County radon figures, compared

Calculated by Radon411

Grand Traverse County reports fewer high tests than Michigan overall. 11.5% of its 1,614 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 15.4 points below the 26.9% pooled from 83 Michigan counties.

Ordered from highest share down, it comes 64th 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%; Grand Traverse County sits 24.2 points below it.

Next door, the shares run from 7.7% in Leelanau County to 16.5% in Manistee County, with Wexford County, Benzie County and Leelanau County below Grand Traverse County. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 11.5% share point the same way here.

Half the tests came in under 1.4 pCi/L and half over it; the single highest reached 16.3 pCi/L. The rest split 64.7% under 2 pCi/L and 23.8% from 2 to 4 (Michigan: 46.4% and 26.7%).

CDC's ten-year totals for Grand Traverse County went from 1,259 tests (2005 to 2014) to 1,614 (2008 to 2017), the share going from 12.9% to 11.5%.

Grand Traverse County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Grand Traverse County
Grand Traverse County1,61411.5%1.4 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+15.4 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+24.2 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+45.2 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−8.3 points
Manistee County, MIborders it38816.5%1.6 pCi/L+5.0 points
Missaukee County, MIborders it35014.9%1.6 pCi/L+3.4 points
Kalkaska County, MIborders it20412.7%1.3 pCi/L+1.2 points
Antrim County, MIborders it34312.0%1.5 pCi/L+0.5 points
Wexford County, MIborders it6219.7%1.5 pCi/L−1.8 points
Benzie County, MIborders it3348.7%1.3 pCi/L−2.8 points
Leelanau County, MIborders it6877.7%1.2 pCi/L−3.8 points
Where Grand Traverse County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultGrand Traverse County testsGrand Traverse County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L1,04464.7%46.4%39.6%+18.3 points
2 to 4 pCi/L38423.8%26.7%24.7%−2.9 points
4 pCi/L and above18611.5%26.9%35.7%−15.4 points
Grand Traverse 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
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
Baraga County66 of 8216311.0%1.1 pCi/L
Houghton County67 of 821,09310.8%1.1 pCi/L
Osceola County68 of 8224610.6%1.7 pCi/L
Charlevoix County69 of 825029.8%1.4 pCi/L
Grand Traverse County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 20171,61411.5%1.4 pCi/L16.3 pCi/L26.9%−0.4 points
2007 to 20161,45211.9%1.4 pCi/L16.9 pCi/L26.8%+0.3 points
2006 to 20151,32911.6%1.4 pCi/L16.9 pCi/L26.8%−1.3 points
2005 to 20141,25912.9%1.4 pCi/L16.9 pCi/L26.2%First on file

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

Grand Traverse County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 11 ZIP codes that lie wholly or partly in Grand Traverse County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Grand Traverse County
ZIP codeWhat the state reports
4962025% greater than 4 pCi/L, median 3.0 pCi/L, 20 tests
496338% greater than 4 pCi/L, median 1.6 pCi/L, 12 tests
4963714% greater than 4 pCi/L, median 2.4 pCi/L, 28 tests
4964320% greater than 4 pCi/L, median 2.1 pCi/L, 41 tests
4964915% greater than 4 pCi/L, median 2.2 pCi/L, 39 tests
496839% greater than 4 pCi/L, median 2.3 pCi/L, 11 tests
4968412% greater than 4 pCi/L, median 1.4 pCi/L, 329 tests
4968526% greater than 4 pCi/L, median 2.6 pCi/L, 276 tests
4968610% greater than 4 pCi/L, median 1.6 pCi/L, 293 tests
4969011% greater than 4 pCi/L, median 1.8 pCi/L, 63 tests
4969611% greater than 4 pCi/L, median 2.2 pCi/L, 149 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.

Grand Traverse County, Geology

The ground under Grand Traverse County

Predicted

Most of the ground under Grand Traverse County is one class on USGS's geologic map: 77.1% of its land is low radon potential, with 22.7% moderate. The map puts 77.1% of Grand Traverse County in the area it calls North-Central Michigan Basin and 22.7% in Antrim Shale. USGS gives the first a radon index of 8, in the low band (5 to 8), and the second 10, in the moderate band (9 to 11).

USGS's geologic areas under Grand Traverse 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.Low877.1%
Antrim ShaleGlacial deposits dervied in part from Antrim black shale.Moderate1022.7%

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

Grand Traverse County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Grand Traverse County's is. Of the 7 counties that border it, 2 have more moderate-potential ground, Leelanau County the most at 79.5%.

Share of land by USGS radon potential: Grand Traverse County, the 7 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Grand Traverse CountyZone 377.1%22.7%None
Leelanau CountyZone 29.8%79.5%None
Benzie CountyZone 379.0%20.8%None
Kalkaska CountyZone 394.9%5.1%None
Antrim CountyZone 222.4%77.6%None
Wexford CountyZone 3100%NoneNone
Manistee CountyZone 399.7%NoneNone
Missaukee CountyZone 3100%NoneNone
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Grand Traverse County, Local resources

Radon testing and mitigation in Grand Traverse County

Listed radon professionals by town: Traverse City

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

Grand Traverse County, Questions

Questions about radon in Grand Traverse County

Are radon levels high in Grand Traverse County?

Over the 2008 to 2017 laboratory totals, 11.5% of the radon tests reported to CDC for Grand Traverse County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.4 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 63 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Grand Traverse County?

Grand Traverse County borders 7 counties: Leelanau County, Benzie County, Kalkaska County, Antrim County, Wexford County, Manistee County and Missaukee County.

Products

Grand Traverse County, Products

Testing a home in Grand Traverse County

In Grand Traverse County, 11.5% of 1,614 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 Grand Traverse County.

Test kits and monitors3

See every kit and monitor

Best radon monitors for Grand Traverse County homes, compared

Explore

Grand Traverse County, Bordering counties

Counties bordering Grand Traverse County

Calculated by Radon411

Grand Traverse County, Cities and towns

Cities and towns in Grand Traverse County

The Census Bureau estimates 96,729 residents in Grand Traverse County for July 1, 2025, 1,301 more than in 2020 (+1.4%). That works out to 208 people per square mile of land. Traverse City, the largest place on its list (15,832 residents in all), extends beyond Grand Traverse County, so no share of the total is worked out for it. CDC's 1,614 reported tests for 2008 to 2017 work out to 16.7 per 1,000 residents (2025 estimate), close to Michigan's 11.3.

From Traverse City to Fife Lake, CDC publishes no figure by town: each reads Grand Traverse County's.

The cities and towns in Grand Traverse County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Traverse Cityextends beyond Grand Traverse County15,832+1.0%Counted whole
Kingsley1,455+3.0%1.5%
Fife Lake472+1.3%0.5%

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 Grand Traverse County is counted whole, so it has no share.

Grand Traverse County, Homes

Homes in Grand Traverse County

Of Grand Traverse County's 46,435 homes, 72% are detached houses, against 72% across Michigan; 12% are in buildings of five or more homes. Much of Grand Traverse County is recent building: 30% of its homes have gone up since 2000 and the middle year built is 1986, against 1972 for Michigan. Owners live in 77% of the occupied homes (Michigan: 73%), so for most households a test and a fix are their own to order.

Homes in Grand Traverse County, Michigan, 2019 to 2023
HomesGrand Traverse CountyMichigan
Housing units46,4354,599,683
Detached houses72%72%
In buildings of 5 or more12%13%
Mobile homes7%5%
Built before 196020%36%
Built since 200030%15%
Middle year built19861972
Owner-occupied77%73%

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