Cal. Gov. Code § 23268

The proclamation and notice of election shall be published at least once a week for three weeks commencing not less than 70 days prior to the date of the election in a newspaper of general circulation in the territory proposed to be transferred. If there is no newspaper of general circulation within the territory proposed to be transferred, the proclamation and notice of election shall be posted not less than 70 days prior to the date of the election in at least three conspicuous places within the territory proposed to be transferred.