Cal. Elections Code § 9611

(a) This section applies to district elections conducted in accordance with Chapter 4 (commencing with Section 9300) or school district elections conducted in accordance with Chapter 6 (commencing with Section 9500), if the boundaries of the district or school district contain more than one county. The provisions of this section prevail over any provision in those chapters to the extent they conflict. (b) For the purposes of this section, “lead county” has the following meanings: (1) For district elections, “lead county” means the county with the most voters within the district bounds. (2) For school district elections, “lead county” means the county whose superintendent of schools covers the district. (c) The elections official for the lead county shall work with the other counties within the district bounds to establish the deadlines for the submittal of arguments for and against a district or school district measure and rebuttal arguments. (d) Authors shall submit arguments only to the lead county, who shall select which arguments will be printed in the voter information guide in accordance with Chapter 4 (commencing with Section 9300) or Chapter 6 (commencing with Section 9500), as applicable. The elections official for the lead county shall electronically transmit a scanned copy of the selected arguments, along with any accompanying forms, to the elections official of each other county in the district or school district. An elections official who receives arguments selected by the lead county shall include the arguments in the printed and electronic versions of their county voter information guide.