Can you sell a home with a private well in Washington County's PFAS area?
Yes. A private well inside the east metro's 3M PFAS plume does not stop a sale, but it changes your paperwork and your prep. Minnesota law requires you to disclose known PFAS test results, any well advisory, and any treatment system as material facts, and Washington County sellers must also state whether the property sits in a Special Well and Boring Construction Area. The 2018 3M settlement pays for well testing, whole-house carbon filtration, and city water hookups for affected homes, so a documented, treated well closes routinely. The sellers who run into trouble are the ones who skip the testing and let the buyer's lender find the problem first.
By Darin Bjerknes | August 31, 2026
If you own acreage in Lake Elmo, West Lakeland Township, Afton, or the rural edges of Woodbury and Cottage Grove, there's a decent chance your drinking water comes from a private well sitting somewhere over one of the most studied groundwater contamination areas in the country. Wastes containing PFAS were disposed of decades ago at 3M sites in Oakdale, Woodbury, and Cottage Grove, and at the former Washington County Landfill in Lake Elmo. The resulting plume now covers more than 150 square miles of the east metro.
This isn't old news that's fading away. In 2024 alone, Minnesota issued 420 new private well advisories for elevated PFAS, roughly 30 times the prior year, and Lake Elmo, West Lakeland Township, and Afton topped the list. In May 2026, the MPCA released a seven-year feasibility study recommending a major pump-and-treat network because PFAS concentrations in east metro groundwater appear to be slowly increasing as the plume moves toward the Mississippi and St. Croix rivers.
So when a seller calls me and says "we're on a well out here, is this going to blow up my sale," it's a fair question. Here's how I walk clients through it.
What Minnesota requires you to disclose
Three separate disclosure obligations stack up on a PFAS-area well sale.
The material fact rule. Minnesota Statute 513.55 requires you to disclose, in writing and before the purchase agreement is signed, every material fact you know that could adversely and significantly affect the buyer's use of the property. Known PFAS test results, a well advisory letter from the Minnesota Department of Health, and any treatment system installed on your well all qualify. A buyer has two years after closing to bring a claim under Statute 513.57 if you knew and stayed quiet. If you've read my post on selling a home as-is in Minnesota, you already know an as-is sale doesn't waive this.
The well disclosure. Statute 103I.235 requires a written well disclosure before the purchase agreement, showing the location and status of every well on the property, plus a Well Disclosure Certificate filed at closing with a $54 county fee. This applies to every well sale in Minnesota, and I covered the mechanics in my guide to selling a home with a well and septic in Washington County.
The Washington County extra. Here's the piece most sellers have never heard of. If your property isn't served by municipal water, you must state in writing whether, to your knowledge, the property sits inside a Special Well and Boring Construction Area. The Minnesota Department of Health has designated SWBCAs across the plume area precisely because of the 3M contamination: the Lake Elmo/Oakdale area was designated in 2007, and the Baytown/West Lakeland/Bayport/Lake Elmo area dates to 1988 and was most recently revised in January 2025. Inside an SWBCA, nobody constructs, repairs, or seals a well without written MDH approval first. Your buyer needs to know that before they dream up plans for a new irrigation well.
None of this is a reason to panic. Disclosure is paperwork, and paperwork is manageable. The real leverage is in what you do before you list.
Testing and treatment: what the 3M settlement pays for
The 2018 settlement between Minnesota and 3M, $850 million before legal fees, funds an ongoing private well program in the east metro that most sellers don't realize they can use.
Testing is free for eligible wells. If your property falls within the priority sampling area, you can submit a Groundwater Sampling Request Form to the MPCA and a contractor will contact you within about 30 business days to schedule a sample. Compare that to paying a specialized lab $300 to $600 per sample yourself. The MPCA's interactive well sampling map for the east metro shows which wells have been tested near you and how they came back.
Treatment is free if your well gets an advisory. If MDH issues a health advisory on your well, the state's remedy, funded by the settlement, is either a reimbursed connection to city water or a whole-house granular activated carbon filtration system, often called a POETS unit, installed and maintained at no cost to you. Roughly 1,000 of these systems are already running on east metro homes, and the MPCA schedules yearly visits to swap the carbon.
The system transfers with the house. When you sell a home with an MPCA-installed filtration system, disclose the system and the MPCA's contact information in your disclosure package. The new owner inherits the free maintenance program, and they need to allow the MPCA continued access for carbon changes. Framed correctly, this is a selling point: the buyer gets tested water, a professionally maintained treatment system, and a state agency on the hook for upkeep. Very few houses can say that.
One caution on timing. If your well has never been tested, testing before you list means you'll know what your buyer would eventually find out anyway, on your schedule instead of theirs. Yes, a bad result becomes a known material fact you must disclose. It was already your water either way. I'd rather negotiate from a documented, treated well than watch a deal die in week three over an unknown.
How buyers, lenders, and appraisers react
Financed buyers can't just shrug at a private well. FHA requires a water quality test from a state-certified lab before closing on any private well property, and VA requires the water to meet EPA or local standards, with tests generally good for 90 days. The standard panels cover coliform, nitrate, nitrite, and lead rather than PFAS, but in a documented contamination area, underwriters and appraisers can and do ask follow-up questions when the file mentions a well advisory. A ready folder of test results and treatment records answers those questions before they become conditions.
On value: national research has measured discounts of roughly 3 to 7 percent for homes with contaminated wells in high-profile PFAS areas, driven heavily by uncertainty and media coverage. That's the cost of an unknown. A well with current test results, a settlement-funded treatment system or city hookup, and clean post-treatment numbers removes most of that uncertainty, which is exactly what east metro buyers, who mostly already know the 3M story, are looking for. In a market where Twin Cities inventory sits near three months of supply and homes average about 40 days on market, you don't want your listing carrying an open question every other listing has answered.
Practically, I see three seller paths:
- Untested well: request free settlement sampling before listing, then market with documentation.
- Advisory well with treatment: gather your MDH advisory letter, MPCA system records, and post-treatment results, and present the maintenance program as the asset it is.
- Already on the list for city water: disclose the pending hookup and the reimbursement terms, and coordinate timing with the buyer through the purchase agreement.
Which path you're on, and how to sequence it against your listing date, is a conversation worth having early. This is exactly the kind of question I walk east metro sellers through before we ever talk price, alongside the usual math in my breakdown of what it costs to sell a home in Woodbury.
Frequently Asked Questions
Do I have to test my well for PFAS before selling in Minnesota?
No statute forces a pre-sale PFAS test. You must disclose the well itself, any known test results or advisories, and the Special Well and Boring Construction Area status in Washington County. But in the east metro plume area, testing is free through the 3M settlement, and knowing your number before the buyer's lender asks is almost always the stronger position.
Who pays for a PFAS filter or city water hookup in the 3M settlement area?
The settlement does. If MDH issues a health advisory on your private well, the state pays for either a whole-house granular activated carbon system or a reimbursed connection to municipal water, including ongoing filter maintenance by the MPCA. Homeowners in eligible east metro communities pay nothing for testing or treatment.
Does a PFAS advisory lower my home's value?
An unresolved, undocumented water question can, with studies in other states measuring discounts of roughly 3 to 7 percent for contaminated wells. A treated well with current results and state-funded maintenance recovers most of that, because you've replaced uncertainty with documentation. Local buyers generally know the plume exists; what they're pricing is whether your specific well is handled.
What happens to the free carbon filtration system when I sell?
It stays with the house, and the maintenance program transfers to the new owner. You disclose the system and the MPCA's contact information, and the buyer allows the agency yearly access to replace the carbon. Buyers should also request past test results directly from the MPCA.
Can a buyer drill a new well in Lake Elmo or West Lakeland Township?
Not without written approval from the Minnesota Department of Health. Both areas sit inside Special Well and Boring Construction Areas, where any well construction, repair, or sealing requires an MDH-approved plan first. Sellers must disclose SWBCA status in writing on properties without municipal water.
A private well in the PFAS plume is a documentation problem, not a dealbreaker. Sellers who test early, use the settlement programs, and disclose cleanly close on schedule; sellers who wait for the buyer to discover the issue negotiate from behind.
If you're thinking about selling a well property in Woodbury, Lake Elmo, Afton, or anywhere in the east metro, let's get the water question answered before it costs you leverage. Book a free consultation at https://calendly.com/darintheminnesotan. No pressure, just a straightforward conversation about your property and what the market looks like for you right now.
About Darin Bjerknes Darin Bjerknes is a licensed REALTOR with Minnesōtan, Brokered by REAL, serving the Twin Cities east metro for over 20 years. He specializes in move-up buyers and the luxury segment across Woodbury, Afton, Stillwater, Cottage Grove, Lake Elmo, and surrounding Washington, Ramsey, and Dakota County communities. Connect with Darin at darinbjerknes.com or call 612-702-5126.
