People often ask whether summer is a bad time to test for radon. Levels can vary by season, but the answer is simpler than you'd think: the best time to test is whenever you haven't.
Key takeaways
- Radon is the second-leading cause of lung cancer and is common across Southeast Wisconsin.
- Levels tend to read higher in winter but can be elevated in any season.
- A 48-hour continuous test gives a reliable snapshot any time of year.
Why levels shift with the season
In winter, homes are sealed tight and heating systems can pull soil gas indoors, often producing higher readings. In summer, open windows can lower readings. That's why testing follows EPA protocols with closed-house conditions for accuracy.
The bottom line on timing
If you're buying a home, testing during the inspection is the right move regardless of season. If a summer test comes back borderline, a follow-up in heating season can confirm. The risk doesn't take the summer off.
Frequently Asked Questions
What radon level requires action?
The EPA action level is 4.0 pCi/L. At or above that, mitigation is recommended.
How long does a radon test take?
We use continuous monitors over a minimum of 48 hours under EPA protocols.
Is radon really a concern in the Milwaukee area?
Yes. Much of Southeast Wisconsin, including Waukesha County, has elevated radon potential, so testing is strongly recommended.
Ready to protect your investment?
Schedule your inspection with Milwaukee’s trusted team, or call us with questions.
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