ARB has received United States Environmental Protection Agency (U.S. EPA) authorization to enforce the Commercial Harbor Craft Regulation, including new and in-use engine emission limits. In 2007, the California Air Resources Board (ARB) adopted the Commercial Harbor Craft Regulation (CHC regulation), which has reporting, recordkeeping, and monitoring requirements, in addition to requirements for both new and in-use engines. ARB was required to request authorization from the U.S. EPA to enforce the new, in-use, and best available control technology requirements. On December 15, 2011, the U.S. EPA authorized ARB to enforce these provisions of the CHC regulation. ARB will begin enforcing these provisions on August 1, 2012.