Radon Testing in Willmar and Kandiyohi County
You cannot smell it, see it, or taste it, and your neighbor's result tells you nothing about your house. Testing is cheap, fixing blind is not. Here is how to get a number you can trust.
Three ways to test, and when each one fits
Short-term test
2 to 7 days on the lowest lived-in level. The right first step for most homeowners. If the result comes back at 4.0 pCi/L or higher, confirm with a second test or move straight to a mitigation quote.
Long-term test
91 days to a year. Radon swings with seasons, and Minnesota winters usually run higher than summers because the house is sealed and heated. A long-term test gives the truest picture of annual exposure.
Real estate test
Buying or selling triggers the clock. Real estate tests follow stricter placement and timing protocols so the result stands up in the transaction. Minnesota law requires licensed measurement for hire.
Selling a house? Minnesota's disclosure law follows the radon
Since January 1, 2014, the Minnesota Radon Awareness Act has required sellers of residential property to disclose, in writing, any known radon concentrations or past test results before signing a purchase agreement, along with the MDH publication on radon in real estate. In practice that means a high test result does not disappear; it travels with the house until it is fixed.
For sellers around Willmar this cuts two ways. An unmitigated high result can stall a closing or hand the buyer a bargaining chip. A mitigated home with an MDH-tagged system and a clean post-test is a selling point, not a liability. Buyers' inspectors in Kandiyohi County order radon tests routinely, so finding out before you list beats finding out during the option period.
High result on a deal deadline? Mitigation is usually a one-day job, and quotes are fast: get one here.
Testing right: the details that change the number
- Test the lowest level someone actually uses: finished basements count.
- Keep windows and doors closed for 12 hours before and during short tests. Normal entry and exit is fine.
- Keep the kit away from drafts, sump pits, exterior walls, and humidity sources like bathrooms.
- Winter numbers run higher than summer numbers in Minnesota. A borderline summer result deserves a winter recheck.
- Retest every 2 years, after any foundation or HVAC work, and after any mitigation install to confirm it worked.
Want the local picture first? See radon levels in Willmar and Kandiyohi County.