Cal. Pub. Res. Code § 5529

At least 10 days before the date fixed for the district election, notice of the election shall be given by publication once in one or more newspapers of general circulation published and circulated in the district. In districts where no newspaper of general circulation is published, notice shall be posted in three public places for two successive weeks. No other notice of an election need be given. The notice shall refer to the wards as previously established by resolution or ordinance of the board of directors.