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Radon Levels in Chippewa County, Michigan

EPA puts Chippewa County in Zone 3, its lowest radon zone, and most reported tests there come back low, though 11.6% of 319 (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

    11.6%

    15.3 pts below MI

    Chippewa
    11.6%
    Michigan
    26.9%

    319 tests, 2008 to 2017

  • Median result

    0.9pCi/L

    Below action level

    Chippewa
    0.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    319

    59th of 82 by tests

    Chippewa
    319
    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

    63 of 82

    Lowest quarter

    Chippewa
    11.6%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Chippewa County

Starts at Chippewa County's median, 0.9 pCi/L

0.9pCi/L

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

EPA’s reading of 0.9 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. Chippewa County's median reported result, 2008 to 2017.

Interpret this reading

The data

Chippewa County, At a glance

Chippewa County at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Chippewa 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 84% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Chippewa County, 2008 to 2017, laboratory
Under 2 pCi/L: 72%2 to 4 pCi/L: 16%4 pCi/L and above: 12%

Of 319 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Chippewa County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L23172.4%
2 to 4 pCi/L5116.0%
4 pCi/L and above3711.6%
What these figures count

These are the 319 tests reported to CDC for Chippewa 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

Chippewa County, Compared

Chippewa County radon figures, compared

Calculated by Radon411

Chippewa County reports fewer high tests than Michigan overall. 11.6% of its 319 tests over the 2008 to 2017 laboratory totals were at or above 4 pCi/L. That is 15.3 points below the 26.9% pooled from 83 Michigan counties.

Ordered from highest share down, it comes 63rd 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%; Chippewa County sits 24.1 points below it.

Mackinac County, the one bordering county with a figure for the same period, reported 19.8%. Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 11.6% share point the same way here.

Half the tests came in under 0.9 pCi/L and half over it; the single highest reached 30.5 pCi/L. The rest split 72.4% under 2 pCi/L and 16.0% from 2 to 4 (Michigan: 46.4% and 26.7%).

CDC's ten-year totals for Chippewa County went from 487 tests (2005 to 2014) to 319 (2008 to 2017), the share going from 11.1% to 11.6%.

Chippewa County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Chippewa County
Chippewa County31911.6%0.9 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled+15.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+24.1 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+45.1 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−8.4 points
Mackinac County, MIborders it9119.8%1.2 pCi/L+8.2 points
Luce County, MIborders it244.2%1.0 pCi/L−7.4 points
Where Chippewa County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultChippewa County testsChippewa County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L23172.4%46.4%39.6%+26.0 points
2 to 4 pCi/L5116.0%26.7%24.7%−10.7 points
4 pCi/L and above3711.6%26.9%35.7%−15.3 points
Chippewa 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
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
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
Chippewa County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 201731911.6%0.9 pCi/L30.5 pCi/L26.9%−0.4 points
2007 to 201635012.0%0.9 pCi/L30.5 pCi/L26.8%Level
2006 to 201540712.0%0.8 pCi/L30.5 pCi/L26.8%+0.9 points
2005 to 201448711.1%0.9 pCi/L30.5 pCi/L26.2%First on file

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

Chippewa County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 12 ZIP codes that lie wholly or partly in Chippewa County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Chippewa County
ZIP codeWhat the state reports
4971510% greater than 4 pCi/L, median 0.6 pCi/L, 30 tests
497190% greater than 4 pCi/L, median 0.0 pCi/L, 5 tests
4972414% greater than 4 pCi/L, median 0.9 pCi/L, 7 tests
497250% greater than 4 pCi/L, median 0.3 pCi/L, 8 tests
49726
497362 tests, figures not shown
497521 tests, figures not shown
497608% greater than 4 pCi/L, median 0.3 pCi/L, 13 tests
497681 tests, figures not shown
497802 tests, figures not shown
497836% greater than 4 pCi/L, median 0.3 pCi/L, 143 tests
497882 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.

Chippewa County, Geology

The ground under Chippewa County

Predicted

USGS's geologic map puts all of Chippewa County's mapped land in one class: low radon potential. 84.0% of it lies in the area the map calls Glacial Lakes, to which USGS gives a radon index of 7, in the low band (5 to 8).

USGS's geologic areas under Chippewa County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glacial LakesSilt and clay glacial lake deposits.Low784.0%

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

Chippewa County beside the ground around it

Across Michigan 9.6% of the land is rated high; none of Chippewa County's is. None of the 2 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Chippewa County, the 2 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Chippewa CountyZone 384.0%NoneNone
Mackinac CountyZone 393.5%NoneNone
Luce 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

Chippewa County, Local resources

Radon testing and mitigation in Chippewa 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

Chippewa County, Questions

Questions about radon in Chippewa County

Are radon levels high in Chippewa County?

Over the 2008 to 2017 laboratory totals, 11.6% of the radon tests reported to CDC for Chippewa County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.9 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 62 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Chippewa County?

Chippewa County borders 2 counties: Mackinac County and Luce County.

Products

Chippewa County, Products

Testing a home in Chippewa County

In Chippewa County, 11.6% of 319 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 Chippewa County.

Test kits and monitors3

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Best radon monitors for Chippewa County homes, compared

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Chippewa County, Bordering counties

Counties bordering Chippewa County

Calculated by Radon411

Chippewa County, Cities and towns

Cities and towns in Chippewa County

About 36,081 people live in Chippewa County by the Census Bureau's estimate for July 1, 2025, 712 fewer than in 2020 (−1.9%). That works out to 23 people per square mile of land. Its largest town, Sault Ste. Marie, has 13,083 residents, 36.3% of the total. Together its 2 incorporated places hold 37.0% of those residents; the other 63.0% live outside any of them. CDC's 319 reported tests for 2008 to 2017 work out to 8.8 per 1,000 residents (2025 estimate), close to Michigan's 11.3.

From Sault Ste. Marie to De Tour Village, CDC publishes no figure by town: each reads Chippewa County's.

The cities and towns in Chippewa County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Sault Ste. Marie13,083−2.1%36.3%
De Tour Village262+1.2%0.7%

2 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).

Chippewa County, Homes

Homes in Chippewa County

Chippewa County is a place of houses on their own lots: 78% of its 20,340 homes are detached single-family houses, against 72% across Michigan. Half of its homes were built before 1976, close to Michigan's 1972: 34% date from before 1960 and 18% from 2000 or later. 74% 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 Chippewa County, Michigan, 2019 to 2023
HomesChippewa CountyMichigan
Housing units20,3404,599,683
Detached houses78%72%
In buildings of 5 or more6%13%
Mobile homes8%5%
Built before 196034%36%
Built since 200018%15%
Middle year built19761972
Owner-occupied74%73%

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