Cal. Wat. Code § 60306
If the board, by resolution, determines that all or a portion of the funds needed to purchase replenishment water, or to remove contaminants from the groundwater supplies of the district, or to exercise any other power under Section 60224, shall be raised by the levy of a replenishment assessment, then the board shall immediately publish a notice that a public hearing will be held on the second Tuesday of April for the purpose of determining whether and to what extent the estimated costs thereof for the ensuing year shall be paid for by a replenishment assessment. The notice shall contain a copy of the board's resolution, the time and place of the hearing, and an invitation to all interested parties to attend and be heard in support of or opposition to the proposed assessment, the engineering survey and report, and the board's determination, and shall invite inspection of the engineering survey and report upon which the board acted. The notice shall be published in each affected county pursuant to Section 6061 of the Government Code, at least 10 days before the hearing date.
Ca. Water Code § 60306