Minnesota Radon, Sump Pumps, and Seller's Disclosures Explained

There are three questions that come up in almost every basement I walk through with an out-of-state buyer, usually in this order: what’s radon, what’s that pump in the corner, and is the seller required to tell me if something’s wrong. Fair questions. Here’s the real answer to each.

Radon Isn’t Rare Here, and That’s the Point

Minnesota has had a Radon Awareness Act on the books since 2014, and the reason is simple: roughly two out of every five homes in this state test with elevated radon levels. That’s not a Southwest Metro problem specifically, it’s a Minnesota problem, tied to our soil and geology, and it has nothing to do with how nice the house is or how new the build is. The law requires sellers to disclose, in writing, any radon test results they know about and any mitigation system that’s already installed, along with a signed state health department statement before you sign a purchase agreement.

Here’s the catch people miss: the law requires sellers to disclose results if they have them, it does not require sellers to actually test in the first place. A disclosure that says “no known test results” doesn’t mean the house is clean, it just means nobody’s checked. I tell every buyer the same thing regardless of what the disclosure says: get your own test during your inspection period. It’s inexpensive, it takes a few days, and a mitigation system if you need one is a manageable cost when you know about it before closing instead of after.

The Sump Pump Question Is Really a Water History Question

A sump pump in the basement isn’t a red flag by itself, plenty of good homes have one as standard protection against groundwater. What actually matters is the history behind it. Minnesota’s disclosure standard requires sellers to report material facts they’re aware of, which includes basement seepage, past flooding, and any real problems the sump pump has had, not just its existence. The standard is knowledge-based, meaning a seller is reporting what they honestly know, not certifying the basement will never see a drop of water again. So the sump pump itself isn’t the question worth asking. “Has this ever failed, and what happened when it did” is.

What a Disclosure Actually Covers, and What It Doesn’t

The Seller’s Property Disclosure Statement is meant to cover material facts that could significantly affect an ordinary buyer’s use and enjoyment of the home, things the seller actually knows about. It is not an inspection, it is not a guarantee, and it doesn’t cover problems the seller genuinely never discovered. That’s exactly why the disclosure and the inspection aren’t substitutes for each other. The disclosure tells you what the seller knows. The inspection tells you what’s actually there. You want both, especially on anything involving water, radon, or the mechanicals hiding behind a basement wall.

None of this is meant to scare anyone off an older Southwest Metro home, most of them are perfectly sound and these are just normal, knowable things to check. It’s meant to make sure you’re checking them, instead of assuming a clean-looking disclosure form means a clean basement.

If you want someone who will protect you along the way, explain what actually needs explaining, and walk you through all of it as it comes up, not just hand you a disclosure form and wish you luck, reach out and let’s talk.

Related reading: if you’re weighing whether to waive the inspection contingency altogether in a competitive offer, here’s the honest answer.

Talk soon, Luka