Cal. Pub. Util. Code § 102263

Before adopting the plan, or an element or amendment thereof, the board shall hold a public hearing. Notice of the time and place of the hearing shall be given at least 30 days before the hearing. The notice shall be published pursuant to Section 6061 of the Government Code and written notice shall also be mailed to each city council and board of supervisors in the district. The hearing may be continued from time to time.