Cal. Pub. Util. Code § 31402

The action of the board of directors evidenced by resolution shall be promptly transmitted to the governing body of such applying city or board of supervisors, and if such action shall grant consent to such annexation, such governing body or board of supervisors may thereupon submit to the qualified electors of such city or the unincorporated county territory, at any general or special election held therein, the proposition of such annexation subject to the terms and conditions fixed as herein provided. Notice of such election shall be given by posting at least 10 days and in three public places in the unincorporated county territory and by publication once at least 10 days before the date fixed for the election in a newspaper of general circulation published in the county or in the city.