When should post-mitigation testing procedures be repeated?

Post-mitigation testing procedures should ideally be repeated within the first year following the mitigation efforts. This timeframe allows for an adequate assessment of the effectiveness of the radon reduction system and ensures that the home remains at safe radon levels over a significant period.

Radon levels can fluctuate due to seasonal changes and varying environmental conditions, so testing after a year gives a more comprehensive understanding of the long-term performance of the mitigation system. Additionally, mitigating radon is a process that can change over time, and regular testing helps confirm that the system continues to operate effectively and that the radon levels do not rise again.

Testing too soon after mitigation, such as immediately or within the first week, might not provide a representative reading since the system needs time to stabilize and demonstrate its effectiveness. Waiting too long, such as beyond a year, may miss a potential rise in radon levels if the system has begun to fail or if other factors have changed in the environment or structure of the home. Therefore, conducting the follow-up test within the first year strikes a balance, ensuring that homeowners are protected while allowing enough time for the mitigative measures to be evaluated properly.