California Code, Elections Code - ELEC § 13303

(a) For each election, each appropriate elections official shall cause to be printed, on plain white paper or tinted paper, without watermark, at least as many copies of the form of ballot provided for use in each voting precinct as there are voters in the precinct. These copies shall be designated “county voter information guide” upon their face and shall include a substantial facsimile of the official ballots used in the election, except as otherwise provided by law. A county voter information guide shall be mailed, postage prepaid, no later than 21 days before the election to each voter who is registered at least 29 days before the election.

(b) The elections official shall send notice of the polling place, which includes vote centers, to each voter with the county voter information guide. Only official matter shall be sent out with the county voter information guide as provided by law.

(c) The elections official shall send notice of the polling place, which includes vote centers, to each voter who registered after the 29th day before the election and is eligible to participate in the election. The notice shall also include information as to where the voter can obtain a county voter information guide and a state voter information guide before the election, a statement indicating that those documents will be available at the polling place at the time of the election, and the address of the Secretary of State's internet website and, if applicable, of the county internet website where a county voter information guide may be viewed.