Radon Knowledge Base

Additional Radon Reading and Spike Questions

This short topic collects additional questions about radon readings, spikes, and changing numbers. Radon can move with weather, pressure, ventilation, room use, test placement, and seasonal conditions, so one jump does not always tell the whole story. At the same time, repeated elevated readings should not be ignored. The purpose of this page is to help homeowners think about patterns and practical next steps. American Radon Systems focuses on mitigation. If a reading pattern suggests a problem, Bill can review the home, a passive rough-in, a sump or crawlspace detail, an existing fan, or the overall system design.

My radon is 3.9. We're selling in 6 months. Should I mitigate now?

For the radon side, focus on a reliable current reading and a clear mitigation path if the level is elevated. Real-estate paperwork, repair allowances, rental responsibilities, and closing decisions should be handled by the people managing the transaction. Bill can help with the practical radon part: what the number means, whether mitigation makes sense, and what a proper system would involve. If the reading is 4.0 pCi/L or higher, EPA recommends fixing the home. Between 2.0 and 4.0 pCi/L, EPA says to consider mitigation, especially if the space is used often.

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My house was built in 1920. Does an old house have more radon?

For the radon side, focus on a reliable current reading and a clear mitigation path if the level is elevated. Real-estate paperwork, repair allowances, rental responsibilities, and closing decisions should be handled by the people managing the transaction. Bill can help with the practical radon part: what the number means, whether mitigation makes sense, and what a proper system would involve. If the reading is 4.0 pCi/L or higher, EPA recommends fixing the home. Between 2.0 and 4.0 pCi/L, EPA says to consider mitigation, especially if the space is used often.

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Is radon testing required by rule in Illinois?

For the radon side, focus on a reliable current reading and a clear mitigation path if the level is elevated. Real-estate paperwork, repair allowances, rental responsibilities, and closing decisions should be handled by the people managing the transaction. Bill can help with the practical radon part: what the number means, whether mitigation makes sense, and what a proper system would involve. If the reading is 4.0 pCi/L or higher, EPA recommends fixing the home. Between 2.0 and 4.0 pCi/L, EPA says to consider mitigation, especially if the space is used often.

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My radon test for home purchase came back at 3.7. The seller says that's under 4.0 and nothing needs to be done. Are they right?

For the radon side, focus on a reliable current reading and a clear mitigation path if the level is elevated. Real-estate paperwork, repair allowances, rental responsibilities, and closing decisions should be handled by the people managing the transaction. Bill can help with the practical radon part: what the number means, whether mitigation makes sense, and what a proper system would involve. If the reading is 4.0 pCi/L or higher, EPA recommends fixing the home. Between 2.0 and 4.0 pCi/L, EPA says to consider mitigation, especially if the space is used often.

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Questions are fine too. Call or text Bill, or send your address and contact info, and he will take it from there.

Reviewed by Bill Dahlstrom, Illinois radon mitigation license RNM2018212.