California Code, Water Code - WAT § 31634

The district, after the levying of any replenishment assessment, shall give notice thereof to all affected producers as disclosed by the records of the district.  Such notice shall state the rate of assessment for each acre-foot of production during the fiscal year for which the assessment has been levied, and the dates when the assessment or installments thereof are due and payable.  The notice shall be sent by first-class mail with the postage prepaid by the district.