Cal. Pub. Util. Code § 15762

The ordinance calling the election shall be published in the unincorporated territory pursuant to Section 6062 of the Government Code. If no newspaper is printed, published, and circulated in the territory, publication shall be made in a newspaper printed and published elsewhere in the county and deemed most likely to give notice to the electors of the territory. The notice of election shall also be posted in at least two public places in each precinct within each unincorporated territory in which the election is held for at least 10 days prior to the election.