PCBs are regulated as hazardous substances under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) of 1980. They're regulated as toxic substances under Section 313 of Title III of the Superfund Amendments and Reauthorization Act (SARA) of 1986.
Title III of SARA—also known as "The Emergency Planning and Community Right-to-Know Act (EPCRA) of 1986"—specifies that owners and operators of certain facilities that have PCBs on their sites in amounts exceeding a specified reporting threshold are required to report annually releases of PCBs to any environmental medium. The owners and operators of these facilities also are required to immediately report releases of PCBs to environmental media if the amount released exceeds the "reportable quantity" of one pound.
The resources below and at right link to regulatory guidance document for PCBs.