Cal. Pub. Res. Code § 48662
(c) The board shall certify or recertify a rerefiner of used oil, which may be located in this state or be an out-of-state facility, for which the board has received a report from the department that the facility meets either of the following requirements:
(2) If the used oil recycling facility is an out-of-state facility, the facility demonstrates to the satisfaction of the department all of the following: