Cal. Gov. Code § 11343.5

Within 10 days from the receipt of printed copies of the California Code of Regulations or of the California Code of Regulations Supplement from the State Printing Office, the office shall file one copy of the particular issue of the code or supplement in the office of the county clerk of each county in this state, or if the authority to accept filings on his or her behalf has been delegated by the county clerk of any county pursuant to Section 26803.5, in the office of the person to whom that authority has been delegated.