Cal. Water Code § 75430

After the filing of the resolution, plans, specifications, estimate, and proposed assessment, the board shall hold a hearing upon the matter, notice of which shall, not later than three weeks prior to the date of the hearing, be posted in three public places within the district and published in the district pursuant to Section 6062 of the Government Code. The first publication shall be at least 30 days prior to the date fixed for the hearing.