Cal. Food & Agric. Code § 62195

The payment by a handler to any producer, including any nonprofit cooperative association acting as a producer, or the receipt from a handler by a producer, including any nonprofit cooperative association acting as a producer, of a lesser price for any market milk distributed to any person, including any agency of federal, state, or local government, for less than the minimum prices established by the director to be paid by handlers to producers for market milk for the marketing area is an unlawful trade practice.