What is the recommended action for clients once a radon mitigation system has been installed?

Conducting retesting every two years is the recommended action for clients after a radon mitigation system has been installed. This practice is crucial for several reasons. First, radon levels can fluctuate over time due to changes in the building environment, such as alterations in ventilation or the condition of the foundation. Regular testing ensures that the mitigation system is functioning effectively and that radon levels remain below the EPA's action level of 4 pCi/L.

Additionally, testing every two years allows homeowners to maintain awareness of their indoor air quality and protect their health. It serves as a proactive approach to ensure that any potential increase in radon levels is caught early, allowing for timely remediation if necessary. Furthermore, regulatory bodies and health organizations recommend this practice based on accumulated evidence that shows radon levels can change in response to environmental factors, making periodic testing essential even after mitigation systems are in place.