The bill amends Chapter 5-20.8 of the General Laws regarding "Real Estate Sales Disclosures" by introducing a new section that mandates radon inspection and mitigation for residential real estate transactions. It defines key terms such as "radon," "radon test," and "unsafe radon levels," and outlines the circumstances under which radon testing is required. Specifically, a radon test must be conducted no earlier than one year before the closing date of a residential real estate transaction, with the results disclosed to both the buyer and seller, as well as any designated lender.

The bill specifies that the seller is responsible for the costs associated with the radon test and any necessary mitigation if unsafe radon levels are detected. A radon mitigation system must be installed by a certified individual before the closing of the transaction, and a follow-up radon test must be performed to ensure the system's effectiveness, again at the seller's expense. Certain transactions, such as those involving foreclosures, sheriff's sales, tax sales, or transfers for non-residential use, are exempt from these requirements. The act will take effect upon passage.