Water Supply Assessment for the Westside Annexation and Specific Plan Project

The Water Supply Assessment for the Westside Annexation and Specific Plan Project, managed by Los Angeles County Public Works, ensures compliance with California Water Code Section 10910 and Senate Bill 610 for a project in the unincorporated community of Antelope Valley. The project involves the annexation of 7,153 acres and the industrial use of over 38 million square feet. The assessment confirms that Los Angeles County Waterworks District No. 40 has sufficient water supplies to meet an estimated project demand of 8,872.6 AFY over a 20-year projection, accounting for normal, single-dry, and multiple-dry year scenarios. Approved by the County of Los Angeles Board of Supervisors on September 30, 2025, the project is exempt from CEQA as an administrative activity. Key deliverables include the Water Supply Assessment and a Notice of Determination. The administrative process is led by Principle Civil Engineer Ramy Gindi and utilizes demand and supply projections from the 2020 Urban Water Management Plan. The documentation includes extensive exhibits and appendices detailing water rights, basin maps, and legal judgments related to the adjudicated area.