Radon is a serious and underreported health risk in Michigan homes. The EPA classifies most of the Lower Peninsula as Zone 1 or Zone 2, and western Michigan counties consistently record some of the highest radon readings in the state. Radon-related lung cancer kills an estimated 900 Michigan residents every year — most of whom never knew their home had a problem.
Radon Risk in Michigan: What the Data Shows
Michigan’s Lower Peninsula sits on glacial deposits over sedimentary bedrock that includes uranium-bearing shale. The Upper Peninsula adds risk from granitic bedrock. The Michigan Department of Environment, Great Lakes, and Energy (EGLE) estimates that roughly 20 to 30 percent of Michigan homes have radon at or above the EPA action level of 4.0 pCi/L.
Western and southeastern Michigan see the highest radon levels, driven by thick glacial till over shale and limestone formations. Ottawa, Allegan, and Kent counties in western Michigan consistently report elevated readings. In the U.P., Marquette and Houghton counties have documented high levels tied to granite and mafic intrusions.
How Radon Mitigation Works
The standard solution for most Michigan homes is sub-slab depressurization (SSD). A licensed contractor installs a PVC pipe through the foundation slab, connected to a continuously running exhaust fan. The fan draws radon-laden soil gas from beneath the slab and vents it safely above the roofline — before it can enter your living space.
For homes with crawl spaces, a sealed membrane with an attached fan system accomplishes the same result. Both approaches are highly effective: properly installed mitigation systems reduce indoor radon by up to 99%. Systems run 24 hours a day, year-round, and require minimal maintenance beyond periodic fan inspections.
High-Risk Counties in Michigan
Radon can be elevated anywhere in Michigan, but the following counties report the highest concentrations:
- Wayne County (Detroit)
- Kent County (Grand Rapids)
- Washtenaw County (Ann Arbor)
- Oakland County (Pontiac)
- Ingham County (Lansing)
- Genesee County (Flint)
- Kalamazoo County
- Ottawa County (Holland)
- Livingston County
- Macomb County
If you live in or near Detroit, Grand Rapids, Ann Arbor, Lansing, and Kalamazoo, testing is not optional — it is the responsible first step. See also our Ohio radon mitigation guide for a comparison of what a full mitigation installation looks like.
Radon Levels: What the Numbers Mean
The EPA measures radon in picocuries per liter of air (pCi/L). The national average indoor level is 1.3 pCi/L. Here is how to interpret your test result:
| Level (pCi/L) | Risk | Action |
|---|---|---|
| Below 2 | Low | Retest every 2–5 years |
| 2 to 3.9 | Moderate | Consider mitigation; confirm with long-term test |
| 4 and above | EPA action level | Mitigate promptly |
| 8 and above | High | Mitigate as soon as possible |
How Much Does Radon Mitigation Cost in Michigan?
Installation costs in Michigan depend on foundation type, home size, and system complexity:
- Standard sub-slab depressurization: $800 – $1,500
- Complex systems (multiple suction points): $1,500 – $2,500
- Crawl space systems: $1,000 – $1,800
- Post-mitigation follow-up test: $25 – $50
Most Michigan homeowners pay between $1,000 and $1,400 for a standard system. EGLE provides free radon test kits through local health departments. Contact your county health department to check for local assistance programs.
Michigan Radon Contractor Certification
Michigan does not require state-level licensing for radon professionals, but EGLE strongly recommends using contractors certified through the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). Many Michigan counties and municipalities have additional local requirements. Verify national certification before hiring. Always verify your contractor’s credentials before signing a contract. The state program is managed by the Michigan EGLE — Radon Program.
Additional resources: EPA Radon | WHO Radon and Health
Frequently Asked Questions
Is radon a serious problem in Michigan?
Yes. Yes. Most of Michigan’s Lower Peninsula is classified as EPA Zone 1 or Zone 2. Western Michigan counties — Ottawa, Kent, and Allegan — consistently report some of the highest readings in the state. EGLE estimates 20–30% of Michigan homes exceed the EPA action level.
How much does radon mitigation cost in Michigan?
Radon mitigation in Michigan typically costs $800 to $2,500 depending on home size, foundation type, and system complexity. Most homeowners pay $1,000 to $1,400 for a standard sub-slab depressurization installation. Get a free quote below.
Does Michigan require radon contractors to be licensed?
Michigan does not require state licensing, but EGLE strongly recommends using NRPP- or NRSB-certified contractors. Always ask for proof of national certification and verify it on the NRPP or NRSB website before hiring.
How long does radon mitigation take in Michigan?
Most residential ASD systems are installed in 3 to 5 hours. The system begins working immediately. Schedule a follow-up test 24 to 48 hours after installation to confirm radon levels have dropped below 4 pCi/L.
When should I test for radon in Michigan?
Test before buying or selling a home, after any major renovation that affects the foundation or basement, and every two years if your home has an active mitigation system. Michigan’s cold winters mean homes are sealed for months — increasing indoor radon accumulation significantly.
Get a Free Radon Mitigation Quote in Michigan
If your Michigan home has tested above 4 pCi/L — or if you have never tested — act now. Fill out the form below and we will connect you with a licensed Michigan radon contractor for a free quote.
