Cal. Bus. & Prof. Code § 25243
No provision of this article shall preclude a wine from using, on any label, packaging material, or advertising, either (a) a truthful, nonmisleading appellation of origin that complies with Section 4.25(c) of Title 27 of the Code of Federal Regulations governing multicounty appellations, or (b) a truthful, nonmisleading statement as to the geographic location of the wine's stated appellation or appellations of origin which is located in not more than two counties, for which the wine qualifies under applicable federal law, or both the appellation of origin and the statement of geographic location; provided that the label, packaging material, or advertising contains no other use of a name of viticultural significance, in a brand name or otherwise, that is prohibited by Section 25241 or 25242.
Ca. Bus. and Prof'l. Code § 25243