FAQ
Is radon testing necessary in Minnesota?
Quick Answer
Minnesota has some of the highest average indoor radon levels in the country due to its soil composition, so radon testing is widely recommended for home purchases here even though it's not automatically included in a standard inspection. It's a simple, relatively inexpensive add-on given the health information it provides, and it applies to homes of any age — radon isn't limited to older homes or homes with specific visible issues. Testing typically takes just a few days to get results.
Key Takeaways
- Minnesota's soil and geology contribute to naturally higher indoor radon levels than the national average, in homes of any age.
- Radon is an odorless, naturally occurring gas linked to long-term health risks, which is why testing matters even without visible signs of a problem.
- Radon testing is typically a separate add-on to a standard home inspection, not included automatically.
- Test results are usually available within a few days, making it a low-friction addition to your inspection timeline.
- If radon levels come back above recommended action levels, mitigation systems are a common and generally effective, moderate-cost solution — sometimes negotiated as part of the purchase.
Radon comes up in nearly every home purchase conversation I have with buyers new to Minnesota, and for good reason — it's genuinely more relevant here than in a lot of other parts of the country.
Why Minnesota Specifically
Minnesota's soil and underlying geology naturally produce higher radon levels than the national average across much of the state. Radon is a naturally occurring, odorless, colorless gas that can seep into homes through foundation cracks and gaps, and it's linked to long-term health risks with prolonged exposure at elevated levels.
It's not about the home's age or condition
Radon levels are driven by geology and soil, not how old or well-maintained a home is. A brand-new home can have elevated radon just as easily as an older one — this isn't a sign of poor construction.
Why It's Not Part of a Standard Inspection
Standard home inspections focus on visible, physical condition — structure, systems, and surfaces an inspector can directly examine. Radon testing requires a specific testing device left in the home for a set period (commonly 48 hours or more), which doesn't fit into the scope or timeline of a typical walk-through inspection. That's why it's offered as a separate add-on.
48+ hours
Typical Test Duration
A few days
Results Turnaround
Any home age
Relevance
Relatively low vs. mitigation
Cost
Dave's Local Insight
I recommend radon testing on nearly every purchase I work on, regardless of the home's age or how the basement looks. It's inexpensive relative to the information it provides, and it's simple to arrange alongside your main inspection.
What Happens If Levels Come Back High
If radon levels test above recommended action levels, a mitigation system — typically a vent pipe and fan system that redirects radon gas outside before it enters the home — is a common and generally effective fix. This is sometimes negotiated as part of the purchase, with the seller installing a system or providing a credit toward one.
Steps if you're considering radon testing
- Ask your inspector whether they offer radon testing directly or coordinate with a separate tester
- Confirm the testing timeline fits within your inspection contingency deadline
- If levels come back elevated, get a mitigation quote before deciding how to negotiate
- Don't assume a newer home is automatically radon-free — test regardless of age
Bottom Line
Radon testing isn't included in a standard Minnesota home inspection, but it's widely recommended given the state's naturally higher radon levels, regardless of a home's age or condition. It's a relatively inexpensive add-on with a quick turnaround, and if levels do come back elevated, mitigation is a well-established and generally effective solution worth discussing as part of your negotiation.
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Written by Dave Brown
REALTOR®, LPT Realty
Dave Brown is a REALTOR® with LPT Realty who has spent his career helping families buy, sell, and settle into life in Woodbury, Minnesota and the surrounding East Metro. He writes Woodbury Living as a local resource first and a business second — every guide is meant to leave you better informed, whether or not you ever work together.
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