Radon Pros in Minnesota

Last updated: March 2026

Minnesota is classified as a high-risk state for radon, with most of the state falling into EPA Zone 1 or Zone 2. The Twin Cities metropolitan area is one of the highest-radon urban areas in the country, with Hennepin, Ramsey, Dakota, and Washington counties all reporting elevated average indoor levels. Southern Minnesota counties are also heavily Zone 1. The state's glacial soils, uranium-rich bedrock, and long cold winters that keep homes sealed for months create ideal conditions for radon accumulation. Minnesota requires radon mitigators to be licensed by the Minnesota Department of Health, providing a regulatory framework that helps homeowners verify contractor qualifications. In real estate transactions, radon testing is not state-mandated but is considered standard practice throughout the Twin Cities metro and most of the state. Minnesota's radon situation is notable for the combination of high average levels and high population density in affected areas — the Twin Cities metro contains over 60% of the state's population and sits squarely in Zone 1 territory. The Minnesota Department of Health maintains an active radon program with free test kits and public education campaigns. All Minnesota homes should be tested, with particular emphasis on homes with basements, which are the predominant foundation type in the state.