Cal. ELEC § 12261

(a) The boundaries of precincts for the general election shall be the same as those established for the direct primary election, except to the extent necessary to add or subtract precincts as the result of population change or to divide precincts containing more than 1,000 voters or to change precinct boundaries due to jurisdictional boundary changes, or consolidations of elections. Changes of precinct boundaries may also be made when consolidating precincts. (b) This section shall become operative on January 1, 2005.