Michigan · Cost Guide 2026
Radon mitigation cost in Michigan
A standard radon mitigation system in Michigan runs $800–$1,500, with more complex jobs reaching $2,500 (sub-slab) or $1,500–$4,500 for premium block-wall systems. Michigan sits near the national average on price — but unlike Pennsylvania, Minnesota, or Ohio, the state does not license or regulate radon contractors, which shifts the burden of vetting onto you.
What moves the price in Michigan
Radon risk — and demand — concentrates in the Lower Peninsula: the Ann Arbor–Detroit corridor (Washtenaw, Oakland) and the Grand Rapids metro (Kent, Ottawa) see the most activity, with standard sub-slab installs around $1,000–$1,500. Block-wall foundations, common in older Michigan homes, are the expensive case.
Price sources: ALS Radon — Michigan cost; FindRadonPros — Michigan. See our methodology on cost sourcing.
The law: what to demand from a Michigan quote
Here's the critical thing about hiring in Michigan: radon testers and mitigators are NOT licensed or regulated by the state. The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has no regulatory authority over radon contractors, does not audit their work, and does not inspect installations. What EGLE does do is strongly encourage using contractors certified by the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). Because the state won't vet the contractor for you, that vetting is entirely your job: insist on NRPP or NRSB certification, verify it directly with the certifying body, and lean harder on references and written guarantees than you would in a licensed state. In Michigan, the certification is the only credential — there is no state license to fall back on.
Source: Michigan EGLE — Radon Testers and Mitigators.
Radon across Michigan’s metros
Michigan's metro radon concentrates in the southeast and west. Washtenaw County (Ann Arbor) is the metro standout at about 41% of homes over the action level; Oakland County in metro Detroit runs near 29%. Wayne County (Detroit proper) is lower at about 18%, and Grand Rapids' Kent County around 17%. The takeaway mirrors the rest of the state: radon is highly local in Michigan, so two homes in the same metro — even the same county — can land very differently. Test before you assume your area is fine.
Why radon is high in Michigan
Michigan's radon risk is concentrated in the Lower Peninsula, where much of the southeastern and central terrain is classified EPA Radon Zone 1. Glacial deposits left by retreating ice sheets — rich in uranium-bearing material and highly variable from place to place — drive the pattern, which is why radon can differ sharply between neighboring Michigan counties. Washtenaw, Oakland, Kent, and Ottawa counties consistently report elevated indoor levels, and the state's older housing stock and cold winters (which keep homes sealed and drive soil gas indoors) compound it.
Is it worth the cost?
Because Michigan doesn't regulate the industry, the value of getting mitigation right — with a verified, certified installer — is even higher than in a licensed state: there's no regulator to catch a bad job. And the stakes are the same everywhere: radon is the leading cause of lung cancer among non-smokers and, per EPA, responsible for about 21,000 lung-cancer deaths a year. A ~$1,300 system that's properly installed and re-tested is cheap protection. In Michigan's real-estate market, a documented system also clears radon as an inspection issue at sale — worth keeping the paperwork.
Health figures: U.S. EPA, Health Risk of Radon.
What the price actually buys
A standard Michigan price buys an active sub-slab depressurization system: an attic- or exterior-mounted radon fan continuously pulls air from beneath the basement slab through PVC pipe and vents it above the roofline. Most homes need one suction point; block walls and crawlspaces need more. Because there's no state inspection, the post-install re-test matters even more here — it's your only independent proof the system works. The price should include the fan, a manometer, sealing of penetrations and the sump, and that re-test with a written guarantee. The fan runs 24/7 on about a lightbulb's worth of power and lasts 5–10 years.
Foundations & what they cost to fix
Michigan homes span full basements (the cheapest to mitigate), crawlspaces, and the block-wall foundations common in older Detroit-area and Grand Rapids housing. Block walls are the pricey case: their hollow cores can channel radon, sometimes requiring block-wall depressurization on top of a sub-slab system — a premium install that can run $1,500–$4,500. Crawlspaces typically need a sealed vapor barrier tied into the suction. A good Michigan installer will diagnose the foundation first rather than quoting a generic system.
Test before you pay for mitigation
Before you spend a dollar on a system, confirm you actually have a problem — and get a real number, not a guess. A short-term charcoal test kit (a few days in the lowest lived-in level of the home, then mailed to a lab) is the cheapest way to establish your level; a continuous monitor is handy for tracking trends but isn’t a certified measurement. In Michigan, Michigan EGLE Indoor Radon Program is the place to start for low-cost or free kits and guidance. If your result comes back at or above 4 pCi/L, then the cost figures on this page are what to expect. If it’s borderline, re-test before committing — radon fluctuates, and one high reading in a storm week isn’t the same as a sustained problem. You can also check how your county tests up to gauge how likely a high reading is where you live.
Red flags in a Michigan quote
- No NRPP or NRSB certification — in Michigan, with no state license, this is the ONLY credential that matters. Verify it directly.
- A contractor who says 'Michigan doesn't require anything' as a reason to skip certification — technically true, which is exactly why you should insist on it.
- No post-install re-test — with no state oversight, this is your only proof the system worked.
- A standard sub-slab quote on a block-wall foundation without diagnosing it.
- No written guarantee that levels will drop below the action level.
Michigan’s highest-radon counties
Share of tested homes at or above 4 pCi/L, worst first. CDC EPHT (labs), 2008–2017.
| County | % ≥ 4 pCi/L | Median | Tests |
|---|---|---|---|
| Lenawee | 56.7% | 4.6 pCi/L | 1,349 |
| Branch | 55.4% | 4.4 pCi/L | 586 |
| Hillsdale | 54.8% | 4.4 pCi/L | 1,177 |
| Jackson | 49.7% | 3.9 pCi/L | 1,989 |
| Livingston | 43.1% | 3.4 pCi/L | 3,306 |
| Washtenaw | 41.3% | 3.2 pCi/L | 5,668 |
| Dickinson | 39.3% | 3.1 pCi/L | 446 |
| Clinton | 38.5% | 3.1 pCi/L | 1,466 |
| Otsego | 38.2% | 3.2 pCi/L | 598 |
| Ionia | 36.8% | 2.9 pCi/L | 899 |
Counties with fewer than 50 tests are excluded from this ranking. Look up your ZIP for your county.
Testing in Michigan
Michigan's EGLE Indoor Radon Program provides education, a radon hotline (800-RADON-GAS), and referrals — but because the state doesn't regulate contractors, it points residents to their local health department for lists of certified professionals. Michigan does publish good radon test data at the ZIP level, refreshed regularly, which is one reason Michigan is a state where we can eventually go beyond the national baseline. For finding a vetted installer, your county health department plus independent NRPP/NRSB verification is the reliable path.
Michigan EGLE Indoor Radon Program · Michigan radon program overview
Michigan radon cost FAQ
- Do radon contractors have to be licensed in Michigan?
- No — Michigan does not license or regulate radon contractors, and EGLE has no authority to audit their work. The state instead recommends hiring NRPP- or NRSB-certified professionals. Because there's no state license, verifying that certification yourself is essential.
- How much does radon mitigation cost in Michigan?
- A standard sub-slab system runs $800–$1,500, with complex jobs up to $2,500 and premium block-wall systems $1,500–$4,500. Michigan is near the national average.
- Where is radon worst in Michigan?
- The Lower Peninsula, especially the Ann Arbor–Detroit corridor (Washtenaw, Oakland) and Grand Rapids metro (Kent, Ottawa). Much of southeastern and central Michigan is EPA Radon Zone 1.
- If Michigan doesn't regulate radon work, how do I find a good contractor?
- Get a list from your county health department, require NRPP or NRSB certification, verify it directly with the certifying body, check references, and insist on a post-install re-test and written guarantee. The certification is your main safeguard in an unregulated market.
- What should a Michigan radon quote include?
- Verified NRPP/NRSB certification, a foundation-specific system design, a post-install re-test confirming levels below 4 pCi/L, and a written guarantee tied to that result.