A radon test can be performed during the inspection window for a real estate transaction, or by any homeowner who wants to know the radon concentrations within their home. The EPA recommends you know the indoor radon level in any home you consider buying.

Real estate transaction radon testing is short-term, using a continuous radon monitor, with duration of at least 48 hours.

Any home can have elevated radon levels, and even homes next to each other can have different levels of indoor radon due to construction and geographic difference. Every home should be tested, old or new, and even if it already has a radon remediation system in place.

The radon tester must enter a house twice for each test. Since our radon monitors are in continuous use, it is advisable to plan ahead and call early to schedule the radon test during the planned inspection window.

Radon testing in progress door hanger

A continuous radon monitor records data once per hour for the test duration, and the results are averaged. For real estate transactions, the radon monitor is placed in the lowest level of the house suitable for occupancy. If the lowest level of your house is greater than 2,000 square feet, two radon monitors will be required for the test.

What you should do during the radon test

Before starting the radon test, the house must be fully closed for at least 12 hours and remain closed for the entire 48 hour test, except for normal entry and exit.

The radon monitor is about the size of shoebox and needs to be placed where it won’t be disturbed during the testing time period.

If closed house conditions are not maintained, or if the radon monitor is disturbed, the test will be invalidated.

Once the test is complete, we will pick up the testing machine, and email you a detailed report that includes the radon concentration for each hour, and the average during the entire test.


Above is an example radon test result for a home that had average radon concentration of 14. pCi/L. The radon test machine records the concentration each hour for the test duration and averages the results with minimum and maximum concentrations. The EPA action level is 4.0 pCi/L, so the Test Result is “Mitigation Recommended” as it is over the set action level.

No level of radon exposure is safe, and indoor air with less than the EPA action level may still pose a threat. For most Americans, their greatest exposure to radon is inside their homes, especially rooms below grade, rooms in contact with the ground, or rooms directly above them.

Testing is the only way to know if you or your family are at risk from radon. You can call 614-782-1705 or click the button below to schedule a radon test at your home.

Written by Warren Watkins

Warren Watkins is a Software Quality Assurance Director.

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