Should testing locations for post-mitigation tests be the same as pre-mitigation tests?

Testing locations for post-mitigation tests should ideally be the same as the pre-mitigation tests to ensure comparability of results, which is essential for evaluating the effectiveness of the radon mitigation system. By conducting the post-mitigation test in the same location, you can accurately assess whether the mitigation has been successful in reducing radon levels to acceptable thresholds.

If the measurement location differs, it could become challenging to interpret the results since variations in radon concentration can occur naturally due to factors such as differing environmental conditions, building characteristics, and usage patterns in different areas of the property. While testing in the lowest level that could be occupied is important, consistency in testing locations helps ensure that any changes noted are solely due to the mitigation efforts rather than other variables. This adherence to testing protocols reinforces the reliability and integrity of the radon measurement process.