Salt and Nutrient Management Plan Update for the Central Basin and West Coast Basin Joint Funding Agreement

The Proposed Project consists of a joint funding agreement to complete a data assessment and proposed updates to the Salt and Nutrient Management Plan (SNMP) for the Central Basin and West Coast Basin. The State Water Resources Control Board's policy for Water Quality Control for Recycled Water, which was adopted in 2009 and has been subsequently amended, establishes uniform requirements for recycled water used, encourages the development of SNMPs, and requires assessment and review of data generated from SNMPs every 5 years. In 2011, the Board of Supervisors authorized the Los Angeles County Flood Control District (District) to enter into an agreement with the Water Replenishment District of Southern California (WRD) to jointly finance the preparation of the SNMP for the Central Basin and West Coast Basin. The jointly prepared SNMP was adopted by the Los Angeles Regional Water Quality Control Board and the State Water Resources Control Board in 2015. In 2024, the Los Angeles Regional Water Quality Control Board issued a letter requesting a data assessment for the SNMP for the Central Basin and West Coast Basin. As the primary agency responsible for managing groundwater in the Central Basin and West Coast Basin, WRD is the lead in conducting data assessments and proposed updates to the SNMP for the Central Basin and West Coast Basin. WRD is also coordinating the multi-agency funding agreement to continue the joint efforts for the SNMP with the other agencies who have various roles in groundwater management for the region. Per the Los Angeles County Flood Control Act, the District is authorized to manage flood control and water conservation facilities within its boundaries, including the spreading of imported, recycled, and/or stormwater at the Rio Hondo Coastal, San Gabriel Coastal, and Dominguez Gap Spreading Grounds; and the injection of imported and recycled water at the West Coast, Dominguez Gap, and Alamitos (Seawater) Barriers to recharge and protect the groundwater basins within the County of Los Angeles, including the subterranean regional aquifers known as the Central Basin and West Coast Basin.