California Code, Business and Professions Code - BPC § 25238

Every winegrower or bottler of wine of any kind within the counties specified in Section 25236 shall keep a record of all wine not produced by him or her and obtained and used by him or her for any purpose.  The record shall show the date the wine is obtained, the amount thereof, the source from which obtained, the kind or type of wine, and, in detail, the purpose or purposes for which it is used.  Each winegrower or bottler of wine shall keep a complete record showing the total amount of wine produced by him or her, or bottled by him or her, made entirely from grapes grown within the counties mentioned in Section 25236.