CA Water Code Section 31634.5

Except as provided in Section 31636, each producer, on or before the dates when the assessment or installments thereof are due and payable, shall file with the district a sworn statement setting forth the total quantity of water production in acre-feet which is subject to the replenishment assessment. Such production shall be reported as of the end of the month immediately preceding the payment date. The statement shall be on a form prepared by the district, and to the extent practicable, shall identify separately the production from each well or other water-producing facility. The statement shall also include a general description or number locating such well or water-producing facility, the method or basis of the measurement or computation of production, and such other information as the district may require.