California Code, Food and Agricultural Code (Formerly Agricultural Code) - FAC § 78924

(a) Every producer and vintner shall keep complete and accurate records of winegrapes produced, processed, and marketed, including, but not limited to, the number of tons of winegrapes delivered to or received by vintners, whether within or outside of Mendocino County, the names of the producers from which vintners receive winegrapes, and records related to the sale of winegrapes, wine, or winegrape products. The records shall be in simple form and contain information as the commission shall prescribe. The records shall be preserved by producers and vintners for a period of five years and shall be offered and submitted for inspection at any reasonable time upon demand of the commission or its duly authorized agent.

(b) For purposes of this section and for any other section of this chapter that relates to recordkeeping or the collection and remittance of assessments from producers, including any section dealing with confidentiality of information received from vintners, the term “vintner” shall include persons in this state outside Mendocino County who otherwise meet the definition of vintner in Section 78839. Those persons shall not be required to pay the vintner assessment established by the commission, but shall collect and remit assessments and reports regarding winegrapes received that were produced in Mendocino County.