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A past measurement is a record, not a lifetime assurance
If you have never tested, start there. If you already have a report, check the date, tested level and whether the way the home is used has changed. Keep the document rather than relying on a remembered number.
Testing frequency depends on the question you are trying to answer. Routine homeowner checks and the evidence a buyer wants during a transaction are related, but not identical, situations.
Read the recommendations in context
The NC Radon Program advises testing at intervals no longer than five years, including homes with a mitigation system. EPA’s transaction guidance notes that a buyer may request another test when the previous result is not recent, for example within two years, or when the home or occupied level has changed. These are different contexts, not competing guarantees.
EPA also advises retesting a lower level when living patterns change to occupy it. Discuss timing after renovations or a change in living space rather than waiting solely for a calendar interval.
Keep a useful testing record
Save the test location, date, result and any mitigation records together. Note substantial renovations and changes in which rooms are regularly occupied. This helps a testing professional understand what a previous measurement did and did not cover.
With a mitigation system, keep its maintenance documentation as well. The presence of a fan or pipe does not provide a current indoor measurement. Ask the qualified mitigation contractor about operation and follow-up, and arrange appropriate testing.
Choose your next appointment deliberately
Tell Grounded whether you are checking your own residence, reviewing a previous result or buying a home under a deadline. We can explain the scheduling needs for a separate radon test.
Do not interpret a short-term test as a guarantee for every season, and do not treat a reminder date as permission to ignore a recommended follow-up on an elevated result. Keep the actual report and discuss its next steps promptly.
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