California Code, Public Utilities Code - PUC § 105301

(a) Proceedings for the creation of a service zone may be initiated by resolution of the legislative body or bodies of the city or cities proposed to be included in the service zone, and if unincorporated territory is proposed to be included in the service zone, by resolution of the board or boards of supervisors of the county or counties in which the unincorporated territory is situated.

(b) The resolution or resolutions shall declare that the public interest or necessity demands the creation of a service zone, shall describe its boundaries, and shall request the formation of the service zone.

(c) When the entire area of a public agency is to be included in the service zone, it may be described by name.

(d) Certified copies of the resolution or resolutions shall be filed with the secretary of the district.