Cal. Food & Agric. Code § 34595

Homogenized market milk, which is served from a milk-dispensing device that has been approved for that use by the director, shall be dispensed directly from the dispensing device into the glass or other container from which the customer drinks the milk. It shall be served in minimum quantities of eight ounces in each such glass or container, except that individual servings of less than eight ounces may be served with children’s or junior meals which are sold in a restaurant, as defined in Section 28522 of the Health and Safety Code.