Buying a Home? Don't Overlook Radon Test Results

October 23, 2026      

Finding the right home means looking beyond its layout, location, and asking price. Indoor air quality is another factor worth considering before signing the final paperwork. Radon, an odorless and invisible radioactive gas, can enter a house from the soil beneath it and accumulate indoors. Since it cannot be detected by smell or sight, testing is the only way to determine the radon level.

For homebuyers, understanding the results can help identify potential concerns and plan the next steps before closing.

Three Things to Check in a Radon Report

1. The measured radon concentration

Radon results are reported in picocuries per liter (pCi/L). The U.S. Environmental Protection Agency (EPA) recommends taking action to reduce radon at levels of 4.0 pCi/L or higher. Because there is no known completely safe level of radon exposure, buyers may also consider mitigation when results are lower.

2. How the test was conducted

Radon levels can vary depending on weather, ventilation, and how a home is used. Review whether the test followed appropriate protocols and whether the testing conditions were suitable. If the results are unexpected or close to an action threshold, a qualified radon professional can help determine whether additional testing is appropriate.

3. Whether mitigation is already in place

Some properties have existing radon mitigation systems. Ask whether the system is operating properly and request available records of installation and follow-up testing. A previously installed system does not eliminate the need to verify current radon levels.

What Should You Do if the Results Are High?

Elevated radon results do not necessarily mean a home is unsuitable for purchase. Effective mitigation methods are available for many types of properties, including homes with basements and slab-on-grade foundations.

Before closing, buyers can discuss the findings with the seller and real estate agent, obtain an estimate from a qualified mitigation contractor, and determine who will arrange and pay for any necessary work. If mitigation is completed, follow-up testing should be performed to confirm the reduction in radon levels.

Include Radon in Your Homebuying Plan

A radon report gives you useful information that a standard visual inspection cannot provide. Reviewing the results early allows you to ask questions, understand potential costs, and make decisions based on the property's actual conditions.

The Radon Guys can help you explore radon mitigation options when testing identifies elevated levels. If you're purchasing a home and have concerns about its radon results, contact The Radon Guys to discuss the next steps toward reducing radon in your indoor environment.

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