Winona County, Southern Minnesota
Radon Mitigation in Winona, Minnesota
Winona sits between Mississippi River bluffs made of exactly the kind of rock radon loves: fractured, soluble carbonate. County environmental health officials have estimated that roughly half of Winona County homes test elevated for radon, the county carries the EPA Zone 1 rating, and the DNR specifically maps karst landscape units across Winona County.
For a river town with some of the oldest housing stock in Minnesota, that combination makes radon a standard homeownership question. We connect Winona homeowners with independent, MDH-licensed mitigation contractors for free written quotes.
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Radon Levels Around Winona
~1 in 2
Winona County homes test elevated for radon, per county environmental health estimates
Winona County public health treats radon as a priority and maintains its own radon page for residents. County-by-county test results are published on the MDH data portal, and the county sits in EPA Zone 1, the highest radon potential category. City-level figures are not published separately, so the county picture is the honest Winona benchmark.
Karst Bluffs Over the Mississippi
The DNR has mapped karst landscape units across Winona and Houston counties: soluble limestone and dolomite bedrock, close to the surface in the blufflands, riddled with fractures, sinkholes, and solution openings. That porous, broken rock gives soil gas fast pathways, and MDH ties the gas itself to uranium decaying naturally in rock and soil. The bluff scenery that defines Winona and the county radon numbers are the same geology seen from two angles.
Source: DNR karst lands of Winona and Houston countiesWinona Housing Stock and What It Means for Mitigation
Winona has one of southern Minnesota's deepest stocks of pre-1900 and early-1900s housing: brick and frame homes on stone foundations laid out on the river grid, with postwar and newer construction filling toward the lakes and bluff bases. Stone foundations leak more soil gas and take more sealing; historic facades sometimes push vent pipes to rear or interior routes. Licensed contractors work these houses constantly, and verification testing proves each result.
Local Radon Contacts and Test Kits
Winona County maintains a radon page with local testing information, and the MDH Local Radon Contacts directory lists programs across southeastern Minnesota.
What Does Radon Mitigation Cost in Winona?
The Minnesota Department of Health reports a typical installed range of $1,500 to $3,000 statewide. Foundation type, home size, and routing decide where a Winona home lands. The cost guide breaks down every factor with primary-source numbers.
Verify Your Contractor's Minnesota Radon License
Before you hire anyone for radon work in Winona, check their license. The Minnesota Radon Licensing Act, Minnesota Statutes section 144.4961, requires anyone who performs radon testing, mitigation, or laboratory analysis for compensation to be licensed by the Minnesota Department of Health, and every mitigation system installed under the law must carry an MDH system tag. A licensed professional expects the question. Three things to ask before you sign:
- Can I see your current MDH radon license, and is the company licensed too?
- Will the installed system carry the MDH system tag required under the licensing law?
- Will I get a written, itemized estimate and a follow-up radon test that confirms the system works?
Winona Radon Questions
Why does Winona test so high for radon?
Karst. The DNR maps karst landscape units across Winona County: fractured, soluble carbonate bedrock near the surface that gives soil gas open pathways into foundations. County environmental health officials estimate roughly half of local homes test elevated, and the county carries the EPA Zone 1 rating.
Can a stone-foundation Winona home from the 1890s be mitigated?
Yes. Licensed contractors seal the accessible entry routes, place the suction point through the basement slab or a sump, and route the vent to discharge above the roofline, sometimes up the rear of historic homes to protect street-facing facades. The follow-up test verifies the number.
Does radon matter when selling a Winona home?
Yes, twice over. Minnesota's Radon Awareness Act requires sellers to disclose radon records in writing before a purchase agreement, and in a county where about half of tests run high, buyers here test routinely. A pre-listing test, and mitigation if needed, turns the issue into paperwork instead of a negotiation.
How much is radon mitigation in Winona?
The Minnesota Department of Health reports typical installed costs of $1,500 to $3,000 statewide. Older stone foundations and routing around historic exteriors are the local variables. The contractor you are matched with quotes your house in writing for free before any work begins.
Get a Free Radon Quote in Winona
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