Cal. Pub. Util. Code § 29661
Proceedings for the creation of a special service district may be initiated by resolution of the legislative body or bodies of the city or cities proposed to be included in such special service district and if unincorporated territory is proposed to be included in such special service district by resolution of the board or boards of supervisors of the county or counties in which such unincorporated territory is situated, or if only unincorporated territory is proposed to be included in such special service district, by resolution of the board or boards of supervisors of the county or counties in which such unincorporated territory is situated. Such resolution or resolutions shall declare that the public interest or necessity demands the creation of a special service district, shall describe its boundaries and shall request the formation of such special service district. When the entire area of a public agency is to be included in the special service district, it may be described by name. Certified copies of the resolution or resolutions shall be filed with the secretary of the district.
Ca. Pub. Util. Code § 29661