Solano County LAFCO is a regulatory agency responsible for overseeing the boundaries of cities and special districts within a county. Its primary role is to promote efficient delivery of municipal services and oversee growth. Their approval is required for City annexation because it evaluates whether the proposed expansion aligns with regional planning goals, environmental considerations and the ability of the City to provide services to the annexed area. This process ensures that annexations are in the best interest of both the City and the affected communities.