Minnesota homes test high often. Across properties tested from 2016 to 2025, 36.2% were at or above 4 pCi/L, and the median result was 2.8 pCi/L ^[MN-6]. 68 of Minnesota’s 87 counties are in EPA Radon Zone 1 ^[EPA-5].

RadonCosts lists 94 radon mitigation companies for Minnesota. 92 appear on the Minnesota Department of Health list of licensed mitigation professionals ^[MN-5], and 27 also hold NRPP certification. 13 are based in neighboring states and are licensed in Minnesota.

Minnesota at a glance

Minnesota radon rules

• Licensing: MDH licenses radon mitigation professionals and tells homeowners to avoid unlicensed installers ^[MN-2]. Check a license with MDH’s Radon Service Providers search ^[MN-5].
• System tags: when the system is finished, the licensed professional puts an MDH radon system tag on it. The tag shows the installer name, phone number, install date and license number ^[MN-1]. Owners can ask MDH for a free inspection of any system installed after June 2020 ^[MN-1][MN-2].
• Real estate (Minnesota Radon Awareness Act): before signing a sale agreement, the seller must disclose in writing whether radon tests were done, the most recent results, any mitigation, and details of any system. The disclosure includes the required radon warning statement, and the seller must provide MDH’s “Radon in Real Estate Transactions” publication. This applies to agreements signed on or after Jan 1, 2014. A seller who knows material radon facts and doesn’t disclose them is liable to the buyer, who has two years after closing to sue ^[MN-3].
• Price warning from MDH: be careful with quotes under $1,000, which MDH says are often “too good to be true” ^[MN-2].

Radon by county: highest share of properties at 4 pCi/L or above (2016–2025)

Metro and larger counties: Hennepin 34.0% (median 2.8) · Ramsey 26.8% (2.4) · Dakota 33.9% (2.7) · Anoka 15.3% (1.8, Zone 2) · Washington 27.9% (2.4) · Olmsted 41.7% (3.2) · Stearns 45.3% (3.4) · St. Louis 26.6% (2.2, Zone 2) ^{[MN-6][EPA-5]}

Source: Minnesota Department of Health, MN Public Health Data Access, radon testing 2016–2025 ^[MN-6]. Based on properties that were tested, not a random sample.

Licensed installers in Minnesota

Cities with the most listed companies: Rochester (5), Minneapolis (4), Bloomington (3), Buffalo (3). MDH’s list shows each professional’s service area. Most say “Statewide” and some give a radius, which we show on each listing.

What radon mitigation costs in Minnesota

• MDH: “In general, costs can range from $1,500 to $3,000” ^[MN-1].
• MDH warning: avoid unusually cheap quotes under $1,000 ^[MN-2].
• National surveys: $805–$1,326, average $1,043 ^[ANGI]. Minnesota’s own range sits above this.
• What MN installers post online: 10 of 60 MN-listed websites we could read state a mitigation-system price or price range (crawl Nov 2, 2026). The lowest figure each one posts has a median of $1,250 (range $550–$2,500). These are the companies’ own advertised figures, sometimes for a specific job type (for example new construction or activating a passive system). They aren’t quotes:
  • Athelon Radon Services: $550–$2,300 (source)
  • Straight Answer Home Inspections LLC: $800–$1,500 (source)
  • Problem Solved H.I.S., LLC: $850–$2,000 (source)
  • Radon Defense Systems: $1,000–$1,800 (source)
  • SafeBasements of MN: $1,000–$2,500 (source)
  • A1 Radon Services LLC: $1,500–$2,500 (source)
  • Metro Mitigation: $1,600 (source)
  • Marigold Home Inspections: $1,800 (source)
  • Radon Solutions: $1,900–$2,300 (source)
  • RC Fields LLC: $2,500 (source)
• RadonCosts homeowner reports: not enough yet. Report what you paid.

FAQ

Does a radon installer need a Minnesota license? MDH licenses radon mitigation professionals and tells homeowners to avoid unlicensed installers ^[MN-2]. Look for the MDH license number (RMIT- or RMITS-) on each listing.

Do I have to test before selling? No, but you must disclose what you know and give the buyer the MDH publication ^[MN-3].

What’s the MDH tag on my system? The licensed installer puts it on the finished system. It shows the installer’s name, phone number, install date and license number ^[MN-1].

Data: MDH licensed mitigation professionals (Nov 2, 2026), NRPP and NRSB searches (Nov 2, 2026), MDH radon data 2016–2025, EPA radon zones, US Census 2024 estimates.