Cal. Code Regs. tit. 17, § 17015
(a) A grape wine shall be entitled to the appellation of origin “California” or a geographical subdivision thereof only if:
(1) 100 percent of its volume is derived from fermented juice of fruit grown within California; except that wine spirits produced in California from residues of wines, which contain grapes grown outside of California, may be used in the production of wines bearing the appellation of origin “California” or subdivisions thereof, subject to all of the following limitations:
Note: Authority cited: Sections 208, 26202 and 26515, Health and Safety Code. Reference: Section 26515, Health and Safety Code.
1. Amendment filed 8-10-78; effective thirtieth day thereafter (Register 78, No. 32).
2. New Note filed 3-21-84 (Register 84, No. 12).