Homeowners ask me this one right after their post-installation test comes back clean, usually with a mix of relief and lingering worry. Fair question. You just spent money fixing a problem, and nobody wants to wonder if it's quietly creeping back a year down the road. This comes up often enough after radon testing St. Louis follow-ups that I figured it deserved a proper answer. The honest...
Radon is an invisible gas that can enter homes from the soil beneath a foundation. Because it has no smell, colour, or taste, homeowners cannot identify a problem simply by looking around the basement. Testing is the most reliable way to determine whether radon is present at concerning levels, especially in homes with basements, crawlspaces, or other areas that directly contact the ground.
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