The Board of Supervisors is the legislative and executive body of county government and also serves as the governing body of the Solano County Housing Authority, the Solano Facilities Corporation, the East Vallejo Fire Protection District, and the Rural North Vacaville Water District. In addition, members of the Board represent the County on numerous intergovernmental bodies.

As the governing body for Solano County, the Board is responsible for planning and provision of services related to public needs as required by state and federal law including: adopting the annual budget, adopting county ordinances, setting policies, confirming appointments of most non-elected officials, and assisting citizens in solving problems and addressing local concerns.