# Radon

> An invisible, odorless radioactive gas that comes up from the soil and can build up inside a home. The EPA says it is the leading cause of lung cancer among non-smokers. Testing is separate from a standard inspection.

By David Knorr, founder of BuyWise Home. Last reviewed October 28, 2026. Web page: https://www.buywisehome.com/guide/glossary/radon

## Why it matters to you

The only way to know the level is to test. The EPA recommends fixing a home at 4 pCi/L or higher, usually with a fan and pipe system that vents it outside. Order the test at the start of due diligence so the result is back in time to negotiate.

## Related

- [Step 6: Due diligence](https://www.buywisehome.com/guide/due-diligence)
- [Home inspection](https://www.buywisehome.com/guide/glossary/home-inspection): A visual check of the home's condition by a professional inspector.
- [Sewer scope](https://www.buywisehome.com/guide/glossary/sewer-scope): A camera run through the sewer line, from the house to the street.
- [Due diligence period](https://www.buywisehome.com/guide/glossary/due-diligence-period): The days after signing when, in Georgia, you can walk away for any reason.

_General information based on the standard Georgia REALTORS® purchase contract and public guidance. Your own contract decides: read it, and ask your agent or closing attorney about anything that matters. Not legal or financial advice._