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Locations and reports
Radon in Ann Arbor, Michigan
EPA puts Washtenaw County, where Ann Arbor is, in Zone 1, its highest radon zone, and high results are common there: 41.3% of the 8,500 radon tests reported to CDC (2008 to 2017, laboratory totals) came back 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
Share at 4+ pCi/L
41.3%
14.4 pts above MI
- Washtenaw
- 41.3%
- Michigan
- 26.9%
Washtenaw, 6th of 82 in MI, 2008 to 2017
Median result
3.2pCi/L
Below action level
- Washtenaw
- 3.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Washtenaw's tests, 2008 to 2017
Nearest county
17.5%
Wayne, 23 miles
- Wayne
- 17.5%
- Washtenaw
- 41.3%
5,594 tests, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Washtenaw, where Ann Arbor is
Tests reported
8,500
In Washtenaw
- Washtenaw
- 8,500
- Wayne
- 5,594
Reported to CDC before any fix, 2008 to 2017
Read a result for Ann Arbor
Starts at Washtenaw County's median, 3.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 3.2 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 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. Washtenaw County's median reported result, 2008 to 2017.
The data
Ann Arbor, What is published
What is published for Ann Arbor
Information:
Every figure for Ann Arbor is a county's
Radon data is published by county, not by city, so for Ann Arbor it is Washtenaw County's: its EPA zone (Zone 1) and the 8,500 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.
Ann Arbor covers 28.2 square miles of land, all of it in Washtenaw County. About 122,233 people live there, 4,335 to the square mile.
Ann Arbor, Counties
The county Ann Arbor lies in
MeasuredWashtenaw County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.
Washtenaw CountyZone 1Highest predicted potential
- 41.3%
- Reported tests at or above 4 pCi/L
- 3.2 pCi/L
- Median reported result
- 8,500 tests
- Tests reported to CDC
- None
- Yearly figures on file
Washtenaw County ranks 6th of 82 Michigan counties with 30 or more tests for that period, 14.4 points above the 26.9% pooled across Michigan's counties, 5.6 points above the national pool of 35.7%.
Measured from the middle of Ann Arbor, the nearest counties with a CDC figure for 2008 to 2017, laboratory are Wayne County (23 miles, 17.5% of 5,594 tests), Livingston County (24 miles, 43.1% of 4,885 tests) and Monroe County (26 miles, 30.4% of 1,375 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 13.4% to 56.7%; the farthest of them, Macomb County, is 50 miles away at 13.4%.
The directory lists 5 businesses with an address in Ann Arbor, 5 for testing and 1 for mitigation. Michigan's other cities with a page of their own: Grand Rapids and Lansing.
The counties around Ann Arbor
By distance from the middle of Ann Arbor; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Ann Arbor, Geology
The ground under Ann Arbor
PredictedUSGS's geologic map puts all of Ann Arbor's mapped land in one class: high radon potential. All of it lies in the area the map calls Saginaw Lobe Moraine Area, to which USGS gives a radon index of 12, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Saginaw Lobe Moraine Area | Glacial deposits derived from Sandstone and shale. | High | 12 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Ann Arbor beside its county and Michigan
Ann Arbor sits on more high-potential ground than Washtenaw County as a whole: 100% of the city against 84.9% of the county. Ann Arbor has more high-potential ground than Michigan as a whole: 100% of its land against 9.6%.
The map rates the ground, not the air in any home.
Ann Arbor, Homes
Homes in Ann Arbor
Ann Arbor has 53,715 homes, and many share a building: 37% are in buildings of five or more, 42% are detached houses, against 57% across Washtenaw County. Half of its homes were built before 1971, close to Washtenaw County's 1978: 30% date from before 1960 and 15% from 2000 or later. Most occupied homes here are rented: owners live in 46% (Washtenaw County: 62%). A tenant can run a test; a fix is the landlord's to make.
| Homes | Ann Arbor | Washtenaw County | Michigan |
|---|---|---|---|
| Housing units | 53,715 | 158,115 | 4,599,683 |
| Detached houses | 42% | 57% | 72% |
| In buildings of 5 or more | 37% | 25% | 13% |
| Mobile homes | under 1% | 4% | 5% |
| Built before 1960 | 30% | 25% | 36% |
| Built since 2000 | 15% | 21% | 15% |
| Middle year built | 1971 | 1978 | 1972 |
| Owner-occupied | 46% | 62% | 73% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Ann Arbor, Professionals
Radon professionals listed in Ann Arbor
Businesses whose listed city is Ann Arbor, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Ann Arbor: 1 of 5
5 listings with Ann Arbor as the city. See radon mitigation and testing in Ann Arbor, or all radon professionals in Michigan.
Ann Arbor, Local resources
Local resources for Ann Arbor
Who to ask in Michigan: its radon program, test kits and professionals.
- Michigan Indoor Radon ProgramRun by Michigan Department of Environment, Great Lakes, and Energy, phone 800-723-6642.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- Professionals in Michigan5 listings cover Ann Arbor.
The program's own words on licensing are on the Michigan page.
What it means
Ann Arbor, Questions
Questions about radon in Ann Arbor
What radon zone is Ann Arbor in?
Ann Arbor takes its zone from Washtenaw County, which EPA puts in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in Ann Arbor?
High results are ordinary around Ann Arbor: 41.3% of the 8,500 tests reported from Washtenaw County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home. The median reported result was 3.2 pCi/L.
Should I test my home in Ann Arbor?
Yes. Washtenaw County reported about 3,511 of its 8,500 tests at or above 4 pCi/L. That is above Michigan's pooled 26.9%, and ranks Washtenaw County 6th of the 82 Michigan counties with 30 or more tests. Which homes they were, no map can say. How to test a home.
What ground is Ann Arbor built on, as far as radon goes?
USGS's geologic map puts all of Ann Arbor on one named area, "Saginaw Lobe Moraine Area", rated high for radon potential, radon index 12.
Is radon higher in the counties around Ann Arbor?
It depends which way you go. 3 of the 8 nearest counties with a figure report a larger share than Washtenaw County's 41.3% and 5 a smaller one: from Macomb County (13.4%, 50 miles off) to Lenawee County (56.7%, 31 miles off).
Who tests for or fixes radon in Ann Arbor?
Ann Arbor is the address of 5 businesses in Radon411's directory, 5 listed for testing and 1 for mitigation. Each entry names the public list it came from. Radon professionals in Ann Arbor.
The answers use the published figures of Washtenaw County, the county Ann Arbor lies in.
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