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Radon Levels in Kalamazoo County, Michigan

EPA puts Kalamazoo County in Zone 1, its highest radon zone, and 33.3% of its 4,100 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

    33.3%

    6.4 pts above MI

    Kalamazoo
    33.3%
    Michigan
    26.9%

    4,100 tests, 2008 to 2017

  • Median result

    2.8pCi/L

    Below action level

    Kalamazoo
    2.8 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    4,100

    7th of 82 by tests

    Kalamazoo
    4,100
    Oakland
    16,224

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Michigan

    17 of 82

    Top quarter

    Kalamazoo
    33.3%
    Lenawee
    56.7%

    By share, of 82 with 30+ tests

Read a result for Kalamazoo County

Starts at Kalamazoo County's median, 2.8 pCi/L

2.8pCi/L

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

EPA’s reading of 2.8 pCi/L

Between 2 and 4 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 between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Kalamazoo County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Kalamazoo County, At a glance

Kalamazoo County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Kalamazoo County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 84% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

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

Reported results by concentration band, Kalamazoo County, 2008 to 2017, laboratory
Under 2 pCi/L: 33%2 to 4 pCi/L: 34%4 pCi/L and above: 33%

Of 4,100 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Kalamazoo County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L1,35933.1%
2 to 4 pCi/L1,37733.6%
4 pCi/L and above1,36433.3%
What these figures count

These are the 4,100 tests reported to CDC for Kalamazoo 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

Kalamazoo County, Compared

Kalamazoo County radon figures, compared

Calculated by Radon411

In Kalamazoo County, about 3 in 10 reported tests over the 2008 to 2017 laboratory totals (1,364 of 4,100) were at or above EPA's action level. Against the national pool of 35.7%, the gap is 2.4 points lower. Across 83 Michigan counties pooled together, 26.9% of tests reached that level, so Kalamazoo County runs 6.4 points above its state.

Of 7 neighbours with a figure, 3 reported a larger share at or above 4 pCi/L and 4 a smaller one; the spread is 18.0% (Van Buren County) to 55.4% (Branch County). By share, Kalamazoo County is 17th of 82 Michigan counties with 30 or more tests for the same period.

Half the tests came in under 2.8 pCi/L and half over it; the single highest reached 35.6 pCi/L. Below the action level, 1,359 tests (33.1%) came in under 2 pCi/L, against 46.4% statewide, and 1,377 tests (33.6%) fell between 2 and 4, against 26.7% statewide.

Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 33.3% share point the same way here. USGS geology rates 84% of the county's land high radon potential. CDC also counts 374 tests taken after mitigation in Kalamazoo County for the same period: tests in homes where a fix was already in.

CDC's ten-year totals for Kalamazoo County went from 3,392 tests (2005 to 2014) to 4,100 (2008 to 2017), the share going from 32.7% to 33.3%.

Kalamazoo County against Michigan, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Kalamazoo County
Kalamazoo County4,10033.3%2.8 pCi/LThis county
Michigan, pooled83 counties, pooled114,40726.9%Not pooled−6.4 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+2.4 points
Lenawee Countyhighest in the state1,90756.7%4.6 pCi/L+23.4 points
Muskegon Countylowest in the state6293.2%1.2 pCi/L−30.1 points
Branch County, MIborders it1,04855.4%4.4 pCi/L+22.1 points
Calhoun County, MIborders it1,64936.4%3.0 pCi/L+3.1 points
St. Joseph County, MIborders it1,06834.1%2.9 pCi/L+0.8 points
Barry County, MIborders it1,61530.7%2.6 pCi/L−2.6 points
Cass County, MIborders it57230.4%2.6 pCi/L−2.9 points
Allegan County, MIborders it76618.4%1.7 pCi/L−14.9 points
Van Buren County, MIborders it39418.0%1.9 pCi/L−15.3 points
Where Kalamazoo County's reported results fell, 2008 to 2017, laboratory, beside Michigan and the United States
ResultKalamazoo County testsKalamazoo County shareMichigan shareU.S. shareAgainst Michigan
Under 2 pCi/L1,35933.1%46.4%39.6%−13.3 points
2 to 4 pCi/L1,37733.6%26.7%24.7%+6.9 points
4 pCi/L and above1,36433.3%26.9%35.7%+6.4 points
Kalamazoo 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
Iron County12 of 8226536.2%2.6 pCi/L
Tuscola County13 of 8236935.5%2.6 pCi/L
Eaton County14 of 823,41134.4%2.8 pCi/L
St. Joseph County15 of 821,06834.1%2.9 pCi/L
Lapeer County16 of 8264933.4%2.7 pCi/L
Kalamazoo County17 of 824,10033.3%2.8 pCi/L
Shiawassee County18 of 821,51531.6%2.5 pCi/L
Barry County19 of 821,61530.7%2.6 pCi/L
Cass County20 of 8257230.4%2.6 pCi/L
Monroe County21 of 821,37530.4%2.5 pCi/L
Oakland County22 of 8216,22428.8%2.3 pCi/L
Kalamazoo County ten-year laboratory totals, against Michigan's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestMichigan, pooledChange from the row before
2008 to 20174,10033.3%2.8 pCi/L35.6 pCi/L26.9%+0.3 points
2007 to 20163,67133.0%2.8 pCi/L35.5 pCi/L26.8%−0.2 points
2006 to 20153,58633.2%2.8 pCi/L29.6 pCi/L26.8%+0.5 points
2005 to 20143,39232.7%2.8 pCi/L29.6 pCi/L26.2%First on file

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

Kalamazoo County, State data

Michigan's own radon test data

Measured

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

Michigan EGLE publishes its figures by ZIP code, not by county. These are the 24 ZIP codes that lie wholly or partly in Kalamazoo County, each with the state's own figures for it. Period: About 10 years to 2026-05-15.

ZIP codes in Kalamazoo County
ZIP codeWhat the state reports
4900132% greater than 4 pCi/L, median 2.3 pCi/L, 115 tests
4900226% greater than 4 pCi/L, median 2.4 pCi/L, 115 tests
4900439% greater than 4 pCi/L, median 2.7 pCi/L, 83 tests
4900628% greater than 4 pCi/L, median 2.6 pCi/L, 122 tests
4900712% greater than 4 pCi/L, median 1.2 pCi/L, 25 tests
4900818% greater than 4 pCi/L, median 2.5 pCi/L, 103 tests
4900920% greater than 4 pCi/L, median 2.1 pCi/L, 243 tests
4901224% greater than 4 pCi/L, median 2.6 pCi/L, 21 tests
4901523% greater than 4 pCi/L, median 2.5 pCi/L, 146 tests
4902411% greater than 4 pCi/L, median 2.2 pCi/L, 166 tests
4903479% greater than 4 pCi/L, median 5.1 pCi/L, 14 tests
4904840% greater than 4 pCi/L, median 2.8 pCi/L, 129 tests
4905210% greater than 4 pCi/L, median 0.9 pCi/L, 21 tests
4905341% greater than 4 pCi/L, median 2.9 pCi/L, 41 tests
4906031% greater than 4 pCi/L, median 3.2 pCi/L, 13 tests
4906519% greater than 4 pCi/L, median 2.5 pCi/L, 16 tests
490717% greater than 4 pCi/L, median 1.4 pCi/L, 45 tests
4907258% greater than 4 pCi/L, median 4.7 pCi/L, 12 tests
4907829% greater than 4 pCi/L, median 2.4 pCi/L, 34 tests
4908026% greater than 4 pCi/L, median 2.4 pCi/L, 100 tests
4908338% greater than 4 pCi/L, median 3.3 pCi/L, 99 tests
4908719% greater than 4 pCi/L, median 1.7 pCi/L, 32 tests
4908838% greater than 4 pCi/L, median 3.0 pCi/L, 26 tests
4909731% greater than 4 pCi/L, median 2.7 pCi/L, 58 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.

Kalamazoo County, Geology

The ground under Kalamazoo County

Predicted

Most of the ground under Kalamazoo County is one class on USGS's geologic map: 83.6% of its land is high radon potential, with 2.3% moderate and 14.1% low. The map puts 83.6% of Kalamazoo County in the area it calls Saginaw Lobe Moraine Area and 14.1% in Lake Michigan Lobe Deposits, with one smaller area beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Kalamazoo County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Saginaw Lobe Moraine AreaGlacial deposits derived from Sandstone and shale.High1283.6%
Lake Michigan Lobe DepositsSandy to clayey glacial deposits and some glacial lake deposits.Low814.1%
South-Central Michigan BasinSandy and silty glacial deposits derived from sandstones, gray shales, limestones, and dolomites.Moderate102.3%

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

Kalamazoo County beside the ground around it

Kalamazoo County has more high-potential ground than Michigan as a whole: 83.6% of its land against 9.6%. Of the 7 counties that border it, 2 have more high-potential ground, Branch County the most at 100%.

Share of land by USGS radon potential: Kalamazoo County, the 7 counties bordering it and Michigan
AreaEPA zoneLow potentialModerate potentialHigh potential
Kalamazoo CountyZone 114.1%2.3%83.6%
St. Joseph CountyZone 1NoneNone100%
Barry CountyZone 2None92.9%7.1%
Van Buren CountyZone 397.9%None2.1%
Calhoun CountyZone 1None25.0%75.0%
Allegan CountyZone 391.3%8.7%None
Cass CountyZone 134.5%None65.5%
Branch CountyZone 1NoneNone100%
Michigan83 counties, pooled by land areaVaries45.0%44.3%9.6%

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

Local help

Kalamazoo County, Local resources

Radon testing and mitigation in Kalamazoo County

Listed radon businesses with an address in Kalamazoo County:

Listed radon professionals by town: Kalamazoo, Galesburg

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

Kalamazoo County, Questions

Questions about radon in Kalamazoo County

Are radon levels high in Kalamazoo County?

Over the 2008 to 2017 laboratory totals, 33.3% of the radon tests reported to CDC for Kalamazoo County, Michigan were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.8 pCi/L. Of 82 Michigan counties with 30 or more tests for the same period, 16 reported a higher share; pooled, the state comes to 26.9%.

Which counties border Kalamazoo County?

Kalamazoo County borders 7 counties: St. Joseph County, Barry County, Van Buren County, Calhoun County, Allegan County, Cass County and Branch County.

Products

Kalamazoo County, Products

Testing a home in Kalamazoo County

In Kalamazoo County, 33.3% of 4,100 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 26.9% pooled across Michigan. In Zone 1 the year-round level in Kalamazoo County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Kalamazoo County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Kalamazoo County

Explore

Kalamazoo County, Bordering counties

Counties bordering Kalamazoo County

Calculated by Radon411

Kalamazoo County, Cities and towns

Cities and towns in Kalamazoo County

The Census Bureau estimates 263,795 residents in Kalamazoo County for July 1, 2025, 2,015 more than in 2020 (+0.8%). That works out to 469 people per square mile of land. Its largest town, Kalamazoo, has 72,683 residents, 27.6% of the total. Together its 9 incorporated places hold 51.0% of those residents; the other 49.0% live outside any of them. CDC's 4,100 reported tests for 2008 to 2017 work out to 15.5 per 1,000 residents (2025 estimate), close to Michigan's 11.3.

From Kalamazoo to Climax, CDC publishes no figure by town: each reads Kalamazoo County's.

The cities and towns in Kalamazoo County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Kalamazoo72,683−1.1%27.6%
Portage49,862+1.9%18.9%
Vicksburg3,973+3.7%1.5%
Galesburg2,071+0.7%0.8%
Parchment1,887−2.0%0.7%
Schoolcraft1,439−2.0%0.5%
Richland946−0.7%0.4%
Augusta843−1.9%0.3%
Climax737+0.8%0.3%

9 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).

Kalamazoo County, Homes

Homes in Kalamazoo County

Of Kalamazoo County's 114,463 homes, 64% are detached houses, against 72% across Michigan; 23% are in buildings of five or more homes. Half of its homes were built before 1975, close to Michigan's 1972: 32% date from before 1960 and 19% from 2000 or later. 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 Kalamazoo County, Michigan, 2019 to 2023
HomesKalamazoo CountyMichigan
Housing units114,4634,599,683
Detached houses64%72%
In buildings of 5 or more23%13%
Mobile homes3%5%
Built before 196032%36%
Built since 200019%15%
Middle year built19751972
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.