Cal. Food & Agr. Code § 61332
For the purposes of this chapter, a nonprofit cooperative association which is organized and existing under Chapter 1 (commencing with Section 54001) of Division 20 of this code, that acts for producers, including members and any nonmembers of the association, to whom it accounts on a patronage basis, is a distributor in any transaction which involves the receipt by it of market milk, market cream, or any dairy product from any person other than a producer to whom it accounts on a patronage basis and in any transaction which involves the pasteurization of bulk milk or bulk cream, or the packaging of it in bottles, cartons, dispenser cans, or other consumer packages, or the sale or delivery of packaged milk, packaged cream, or any packaged dairy product.
Ca. Food and Agric. Code § 61332