After mitigation, when must a short-term confirmatory test be completed?

The requirement to conduct a short-term confirmatory test after radon mitigation is essential for ensuring that the mitigation system is working effectively. The confirmatory test should be performed no sooner than 24 hours after the installation, which allows enough time for the system to stabilize and for the indoor environment to adjust post-mitigation. Additionally, the confirmatory test must be completed within 30 days of installation to ensure that the assessment of radon levels is timely and relevant.

This timeframe is established to provide a sufficient window for professionals to measure the effectiveness of the mitigation system while still ensuring that the readings reflect the most current conditions in the home after mitigation efforts have been undertaken. This approach helps homeowners and testers confirm that radon levels have been adequately reduced, thereby reinforcing safety and compliance with health standards regarding radon exposure.