What action is recommended if a mitigation system is modified or repaired?

If a mitigation system has been modified or repaired, it is recommended to consider retesting. This is crucial because modifications or repairs can alter the performance or effectiveness of the system. Retesting ensures that the system is still effectively reducing radon levels to acceptable limits after changes have been made. This step is essential for verifying that the system functions correctly and continues to mitigate radon as intended, providing safety and assurance to the occupants of the building.

In the context of radon mitigation, it is necessary to confirm that the adjustments have not adversely affected the system’s ability to keep radon concentrations low. Regular testing after modifications safeguards against potential increases in radon levels, which could pose health risks. Thus, considering retesting is a best practice aligned with maintaining a safe indoor environment.