California Code, Government Code - GOV § 34886

Notwithstanding Section 34871 or any other law, the legislative body of a city may adopt an ordinance that requires the members of the legislative body to be elected by district or by district with an elective mayor, as described in subdivisions (a) and (c) of Section 34871, without being required to submit the ordinance to the voters for approval.  An ordinance adopted pursuant to this section shall comply with the requirements and criteria of Section 21130 of the Elections Codeand include a declaration that the change in the method of electing members of the legislative body is being made in furtherance of the purposes of the California Voting Rights Act of 2001 (Chapter 1.5 (commencing with Section 14025) of Division 14 of the Elections Code).