On March 10, 2022, the Los Angeles Water Board adopted an amendment to the Water Quality Control Plan for the Los Angeles Region (Basin Plan) to incorporate a total maximum daily load for indicator bacteria in Los Cerritos Channel and Estuary, Alamitos Bay, and Colorado Lagoon, and to suspend the recreational uses in Los Cerritos Channel during unsafe wet weather conditions (Resolution No. R22-002). The Basin Plan amendment was subsequently approved by the State Water Resources Control Board (SWRCB) on December 6, 2022 (SWRCB Resolution No. 2022-0053), and the Office of Administrative Law on September 19, 2023 (OAL File No. 2023-0804-03 S).