On June 26, 2024, after three years of information gathering, exchanges with stake holders and comprehensive research work, the China Chemical Environmental Protection Association (CCEPA) and the Solid Waste and Chemicals Management Center of the Ministry of Ecology and Environment (SWCMC), in cooperation with the Asian Clean Fuels Association (ACFA), completed the high-level literature assessment on the in-water environmental risks of MTBE. The review, conducted by a panel of local and international experts, encompassed situation assessments at home and abroad as well as fieldwork on typical point sources or areas in mainland China. The Priority Controlled Chemicals List (PCCL) meeting successfully completed the final report and outcome of the project.