Cal. Food and Agricultural Code § 74922

(a) Upon receipt of a petition that the secretary determines is acceptable, the secretary shall establish a list of producers who are eligible to vote to establish the commission. In establishing the list, the secretary may require producers, vintners, county agricultural commissioners, and others to submit the names and mailing addresses of all producers. The secretary also may require that the information provided include the quantity of winegrapes sold to vintners and the quantity of winegrapes processed by vintners or, in the alternative, may establish procedures for receiving the information at the time of the referendum. The request for this information shall be in writing. The information required by the secretary shall be filed within 30 days following receipt of the written notice. (b) Any producer whose name does not appear on the secretary’s list may have his or her name included on the list by filing with the secretary a signed statement identifying himself or herself as a producer. Failure to be on the list does not exempt any producer from paying assessments under this chapter.