How often should a house be re-tested for radon after successful mitigation, according to ANSI-AARST standards?

According to ANSI-AARST standards, a house should be re-tested for radon every 2 years after successful mitigation. This periodic testing is essential because radon levels can fluctuate over time due to changes in environmental conditions or alterations within the home. Regular re-testing helps ensure that the mitigation system continues to function effectively and that radon levels remain at a safe level for occupants. By adhering to this 2-year testing guideline, homeowners can maintain awareness of their indoor air quality and promptly address any potential increases in radon concentrations. This proactive approach is crucial for the ongoing health and safety of occupants in the home.