Cal. Bus. & Prof. Code § 23013.5

A “wine blender” is a person authorized to operate a bonded wine cellar pursuant to a permit issued for that purpose under the Internal Revenue Laws of the United States but who does not have facilities or equipment for the conversion of grapes, berries or other fruit into wine and does not engage in the production of wine in commercial quantities, provided that any person who produces or blends not to exceed 200 gallons of wine per year shall not, because of such production or blending, be considered a wine blender within the meaning of this division.