California Code, Health and Safety Code - HSC § 4614.3

If the proposed district includes any part of any other incorporated city, the governing body of the initiating city shall file with the governing body of each such other city a certified copy of its resolution adopted pursuant to Section 4607, which resolution shall contain a request that the governing body of each such other city consent to the formation of such district. The governing body of the initiating city shall not form the district unless prior to the conclusion of the hearing which is provided for by Section 4611 the governing body of each city, any part of which is proposed to be included in the district, by resolution, consents to the formation of the district.