Cal. Bus. & Prof. Code § 25613

Every holder of an on-sale retail license who gives, sells, or otherwise dispenses any draught beer shall, upon the faucet, spigot, or outlet from which the beer is drawn, attach and keep posted a clear and legible notice, placard, or marker which shall in the English language indicate and declare the name or brand adopted by the manufacturer of the draught beer so given, sold, or dispensed by the licensee. If the faucet, spigot, or other drawing device is in a location not within the room of the place of service and consumption of the beer, there shall also be kept posted a similar notice, placard, or marker in the place of service and consumption of the beer which shall truthfully state and indicate only the kinds and brands of draught beer actually on sale in the premises of the on-sale licensee.