Indoor environment
Retest the home for radon
Radon levels can change over time. EPA says retesting at least every two years is a good idea, and earlier testing is appropriate after structural or occupancy changes.
Recommended timingAbout every 2 years and after major changes
What to do
- Retest about every two years, following the test-device directions and closed-house conditions when required.
- Retest after structural changes, significant foundation work or when a lower level begins being used more regularly.
- If a mitigation system is installed, confirm its fan remains on and its monitor or warning device shows normal operation.
- Keep test results and mitigation service records with the home records.
Official guidance and sources
Product instructions and local requirements take priority for the equipment or material installed at your home.