Why Radon Is a Serious Concern in Michigan
Radon is a naturally occurring radioactive gas produced when uranium in the soil breaks down. It is invisible, has no smell, and cannot be detected without proper testing equipment. The EPA estimates that radon causes more than 21,000 lung cancer deaths every year, making it the leading cause of lung cancer among non-smokers.
Michigan is not a low-risk state. Many counties across the Lower Peninsula — including parts of Genesee, Lapeer, Shiawassee, Saginaw, and Oakland Counties — fall into EPA Radon Zone 1 or Zone 2, meaning the average indoor radon level is at or above the EPA action level of 4.0 pCi/L. The glacial soils and bedrock common across mid-Michigan are particularly conducive to radon migration into basements and crawl spaces.
How Radon Enters Your Home
Radon moves from the soil into the air you breathe through any opening that connects your home to the ground beneath it. The most common entry points include:
- Cracks in concrete slabs and basement floors
- Construction joints where the wall meets the floor
- Gaps around service pipes, sump pits, and floor drains
- Crawl spaces with exposed soil
- Cavities inside concrete block walls
- Well water, in some cases, releasing radon when used indoors
Because Michigan basements are often finished and used as living space, radon exposure can be higher than homeowners realize. A finished basement bedroom or family room can quietly accumulate gas at dangerous levels for years before anyone notices.
Why Spring Is the Best Time to Test
Radon levels naturally fluctuate throughout the year, and they tend to be highest during the colder months when homes are closed up tight. Spring testing captures the tail end of those elevated levels, which gives you a more realistic picture of your worst-case exposure.
Spring is also when many Michigan homeowners are:
- Preparing to list a home for sale
- Buying a new property during the busy spring market
- Tackling basement renovations or adding finished living space
- Scheduling annual maintenance as the snow finally clears
A radon test fits naturally into all of these spring activities, and acting now means problems can be addressed before summer.
How a Professional Radon Test Works
Homeowners can purchase short-term test kits at hardware stores, but professional testing offers significant advantages — especially in real estate transactions where the results need to be defensible.
At Mike's Complete Home Inspection, our radon testing service in Flint, MI typically involves:
- Placing a calibrated continuous radon monitor in the lowest livable level of the home
- Maintaining closed-house conditions for at least 12 hours before and during the test
- Allowing the device to record radon levels hourly for 48 to 96 hours
- Generating a professional report with hour-by-hour data, average levels, and clear recommendations
Continuous monitors are tamper-resistant and far more accurate than passive charcoal kits. They also detect attempts to influence the test, which protects buyers and sellers alike.
Understanding Your Results
The EPA recommends taking action when radon levels reach 4.0 pCi/L or higher. They also encourage homeowners to consider mitigation between 2.0 and 4.0 pCi/L, since no level of radon exposure is considered completely safe.
If your test comes back elevated, the good news is that radon problems are very fixable. A licensed mitigation contractor can install a sub-slab depressurization system — essentially a sealed pipe and quiet fan that vents radon from beneath the foundation to the outdoors above the roofline. These systems are highly effective and typically reduce indoor radon by more than 90 percent.
Who Should Test for Radon?
We recommend radon testing for any Michigan homeowner who:
- Has never tested their home
- Tested more than two years ago
- Recently finished a basement or added living space
- Made significant changes to the HVAC system or foundation
- Is buying or selling a home in mid-Michigan
- Has occupants who spend long hours in the basement
Even if a neighbor's home tested low, your home can still have elevated levels. Radon varies dramatically from house to house — even on the same street — because of differences in soil, foundation construction, and how the home is sealed.
Protecting Your Family Starts With a Simple Test
Radon is one of the few serious home health hazards that is both invisible and easily measured. A short professional test gives you peace of mind, a clear baseline, and the information you need to take action if necessary.
At Mike's Complete Home Inspection, we help families across Genesee, Lapeer, Shiawassee, Saginaw, and Oakland Counties understand the air inside their homes. If you have not tested in the last two years — or if you are planning a move this spring — schedule a radon test in Flint, MI, bundle it with a full home inspection, or visit our contact page to breathe a little easier.