Cal. Water Code § 31631.5

If the board determines that funds should be raised by a replenishment assessment, it shall call a public hearing, and shall publish notice at least 10 days in advance thereof pursuant to Section 6061 of the Government Code. Notice shall also be mailed by the district to all producers as disclosed by the records of the district who may be affected by the recommended assessment. Failure of any affected producers to receive such notice shall not affect the validity of any subsequent replenishment assessment. The notice shall contain the time and place of the hearing, a generalized or common description of each area of benefit, the amount of each recommended replenishment assessment, and an invitation to all interested parties to attend and be heard in support of or in opposition to the proposed assessment. The notice shall also state that a copy of the engineering report is available for inspection at the office of the district.