On March 11, 2025, the Board of Supervisors adopted the West San Gabriel Valley Area Plan Project. The Project included an amendment to the General Plan to establish the West San Gabriel Valley Area Plan (WSGVAP), land use and zoning changes, and Title 22 (Planning and Zoning) amendments. These changes were effective immediately, with the exception of the Title 22 (Planning and Zoning) Amendments which took effect on April 11, 2025.

The WSGVAP is a long-range planning and policy document for 9 unincorporated communities of Altadena, East Pasadena-East San Gabriel, Kinneloa Mesa, La Crescenta-Montrose, San Pasqual, South Monrovia Islands, South San Gabriel, South El Monte Island, and Whittier Narrows.  The WSGVAP guides long-term growth of the area through development of a guiding vision, goals, policies, and implementation actions for the unincorporated communities in the West San Gabriel Valley. It supports principles such as walkability, connectivity, and community vibrancy. This project includes a comprehensive land-use analysis of the unincorporated areas. Additionally, development of the Plan involved consistent outreach and collaboration with stakeholders. These stakeholders include community residents, local businesses, community-based organizations, external public agencies, surrounding jurisdictions, and other County departments.