Cal. Gov. Code § 6547.2
Notice of the enactment of an ordinance subject to referendum under Section 6547 shall be published after adoption as required by Section 6040.1 within 15 days after the adoption of the ordinance.
If a local agency does not otherwise have statutory power to enact an ordinance pursuant to Section 6547, the governing body of the local agency is hereby empowered to introduce and enact the ordinance at any regular or adjourned regular meeting by the approving votes of a majority of all of its members. If ordinances of a local agency are not otherwise subject to referendum, then (1) the governing body of the local agency may refer any ordinance enacted pursuant to Section 6547 to the electors of the local agency in the same manner as the board of supervisors of a county may refer county questions pursuant to Section 9140 of the Elections Code, and (2) the electors of the local agency shall have the right to petition for referendum on the ordinance in the same manner and subject to the same rules as are set forth in Sections 9141 to 9145, inclusive, of the Elections Code, except that all computations referred to in those sections and officers of the county mentioned in those sections shall be construed to refer to comparable computations and officers of the local agency. If the governing board of a local agency is an elected board the electors of the local agency for the purposes of this section shall be the electors of the territory entitled to vote at elections for members of the governing board. If a local agency does not have an elected governing board, the electors residing within the boundaries of the local agency who would be qualified to vote for candidates for Governor at any gubernatorial election shall be the electors of the local agency for the purposes of this section.
Ca. Gov. Code § 6547.2