Steele County Public Health sells a radon test kit for $6.50. It sits on a shelf at 635 Florence Ave, a few blocks from downtown Owatonna, available to any resident who walks in during business hours. Most weeks, a handful of people pick one up. Most weeks, more homes than that change hands across the county without one.
That gap is not an accident or an oversight buried in paperwork. It is exactly how Minnesota's radon law is written. If you are buying or selling in Owatonna right now, understanding that gap matters more than knowing the median price on your street.
What the Law Actually Requires a Seller to Do
Minnesota's Radon Awareness Act, in place since January 2014, sounds like a testing requirement. It is not. The statute requires a seller to disclose in writing any radon information they already have: whether a test was ever run, what the results showed, and whether a mitigation system was installed. It also requires both parties to sign the state's official radon warning statement, which tells buyers plainly that a home "may present exposure to dangerous levels of indoor radon gas."
What the law does not do is force anyone to test. If a seller has never run a radon test, the disclosure form simply says so, and the sale proceeds exactly as it would if the home had tested clean. A blank box and a passing result look identical on paper. The Minnesota Department of Health can recommend testing as strongly as it wants. Nothing in the statute makes it happen.
The Numbers That Make the Silence Risky
In most of the country, that gap would be a technicality. In Steele County, it is not. Steele County Public Health reports that 61 percent of homes tested in the county come back with high radon levels, a figure the department states plainly on its own site. Statewide, the picture is nearly as stark: 68 of Minnesota's 87 counties fall into the EPA's highest radon potential zone, and the Minnesota Department of Health's own data shows that roughly 2 in 5 tested homes across the state return levels the department calls a major health risk.
Minnesota's health department has also tracked what happens to testing rates when the market gets competitive. Between 2021 and 2023, real estate radon testing declined sharply, a drop the department attributes directly to buyers waiving inspections to win bidding wars. The legal gap and the market behavior point the same direction: the busier and hotter a market gets, the more likely a radon test gets skipped entirely, in a county where the odds of a problem are close to a coin flip.
What a Disclosure Form Is Actually Required to Include
When a seller does have information, Minnesota law is specific about what has to be on paper before a purchase agreement is signed:
- Whether any radon test has been performed on the property
- The most current test results and reports available
- A description of any mitigation system, including how it operates
- The signed state radon warning statement, acknowledged by both buyer and seller
Notice what is missing from that list. There is no requirement to test before listing, no requirement to test before closing, and no penalty for a seller who genuinely never checked. The only liability exposure is for a seller who knew something and stayed quiet about it.
Old House, New House, Different Math
The radon conversation also changes depending on when a home was built, and that difference matters for anyone weighing an established Owatonna neighborhood against new construction on the edges of town. Minnesota's 2009 residential code requires new homes to be built with a passive radon-resistant rough-in, a sealed sump lid and vent stack that runs from the foundation to the roofline. If a radon test on one of these newer homes comes back elevated, turning that passive system into an active one is usually a matter of adding an inline fan.
Older homes without that rough-in face a bigger job and a bigger bill. Industry cost guides that serve the Owatonna market put a typical active mitigation system at $780 to $1,250. That number climbs for homes with more complicated foundations.
| Home type | Typical mitigation cost |
|---|---|
| New construction with 2009-code passive rough-in | Cost of adding an inline fan, well below a full system |
| Older home, standard basement | $780 to $1,250 |
| Older home, unfinished basement requiring sealing | Around $4,600 |
| Older home, crawl space needing encapsulation | $1,500 to $15,000 |
None of this shows up on the median price you see scrolling through listings. It shows up after an offer is accepted, when a buyer is deciding whether to test at all and, if they do, what to do with the number that comes back.
Why Timing Beats Everything Else
Because the law only cares about what a seller already knows, the entire practical burden of finding out shifts to the buyer's inspection period. A test run during that window still leaves room to negotiate a mitigation credit, ask the seller to install a system before closing, or walk away with earnest money intact. A test run after closing, once the deal is done, leaves a homeowner holding the full bill and no one to negotiate with.
This is the part that connects directly back to the county's own numbers. With 61 percent of tested Steele County homes coming back elevated, the inspection period is not a formality to rush through so an offer looks stronger. It is the only point in the entire transaction where the buyer has real leverage over a genuinely likely outcome.
Owatonna has no shortage of people already doing this work. Deming Home Inspection, on 13th Street Northeast, offers radon testing alongside standard buyer and seller inspections. Owatonna Home Inspections runs InterNACHI Master Certified inspections with radon testing built into its standard reports. Chaps Home Inspection & Radon Testing and HomePro Residential Inspections, which serves Owatonna alongside Faribault and Rochester, both offer the service directly. A local National Radon Defense dealer handles mitigation if a test comes back high. None of this requires a special trip or a specialist search. It requires asking for it before the inspection contingency expires, not after.
Questions Owatonna Buyers and Sellers Ask
If my home tests high, does that kill the sale? Not automatically. An elevated result opens a negotiation, not a dead end. Buyers and sellers routinely settle on a mitigation credit or a pre-closing installation, since the fix itself is well understood and the cost is predictable once the foundation type is known.
Do I need to retest after a mitigation system is installed? Yes, and on a schedule. The Minnesota Department of Health recommends a follow-up test within 30 days of installation to confirm the system is working, then a retest every two years for as long as the system is in place. Homes without a system and with a prior clean result are generally recommended for retesting every five years, or sooner after any major renovation.
What if the seller tells me they never tested? That statement satisfies the legal disclosure requirement completely. It tells you nothing about the actual radon level in the home. Given the county's numbers, treat "never tested" as a reason to test yourself during your inspection period, not as information you can skip past.
Radon testing is one of the smaller line items in an Owatonna closing, and it is one of the easiest to overlook precisely because the law does not force anyone's hand. Given what the county's own numbers say about the odds, it is worth treating like a decision rather than a formality. If you are getting ready to buy or sell in Owatonna and want a clear-eyed read on what your specific home, block, or budget actually calls for, Marissa Babcock is a good place to start that conversation. Schedule a free consultation or request an instant home valuation to see where you stand before the inspection clock starts running.
