Overview of the recently adopted amendments to the Commercial Harbor Craft Regulation, effective January 1, 2023. The amendments will require vessels engaging in commercial activity to upgrade to cleaner technology, in some cases transitioning to zero-emission operations. The amendments will result in an 89% reduction in diesel particulate matter and a 54% reduction in oxides of nitrogen emissions from harbor craft. Additional stringency is also required for harbor craft operating near disadvantaged communities in California. The amendments are in the process of being submitted to the Office of Administrative Law and are expected to be approved by the end of 2022.