Radon levels in Minnesota

About radon in Minnesota

The Minnesota Department of Health says more than two in five Minnesota homes have radon levels that pose a significant health risk, and that any level carries some risk (MDH). That makes Minnesota one of the states where testing matters most.

Minnesota reports its radon data differently from most states. Instead of averaging individual test results, the Department of Health counts tested properties: a home counts as high if any of its tests reached 4 pCi/L or more. The figures here cover 2016 to 2025, and they are published as indicators rather than a single total of tests, so our county pages show the share of tested properties and the number tested each year rather than a test count. Across counties, the share of tested properties with a high result ranges from 15% in Anoka County to 77% in Rock County in the state's southwest corner.

Minnesota has some of the strongest radon laws in the country. Since 2009, all new homes must be built radon-resistant, with sealed entry points and a vent pipe ready for a fan (MDH). The Minnesota Radon Awareness Act requires sellers to disclose any known radon tests, results and mitigation in writing, and to give buyers the Department of Health's "Radon in Real Estate Transactions" publication (Minn. Stat. § 144.496). Since 2019, radon testers and mitigators must hold an annual state licence, and every mitigation system gets an MDH tag (Minn. Stat. § 144.4961).

These records come from tests people chose to order, so they describe tested properties rather than every home. A neighbour's result is no substitute for your own test. Pick your county below to see its results and how it compares with nearby counties.

Written and reviewed by Ray Roman · 2026-11-03