California Code, Water Code - WAT § 31632.5

Before July 1 of each year, the board may by resolution levy a replenishment assessment upon all water production during the following fiscal year within each area of benefit as determined by the board.  The assessment within each area of benefit shall be at a uniform rate per acre-foot.  The resolution shall also state the time or times at which such assessment shall be due and payable, which may be in convenient installments as determined by the board.