Cal. Food & Agric. Code § 16101

If means of incineration of, or other approved processing for, garbage are not available aboard any vessel or aircraft in the state, the master or other person that is in charge of such vessel or aircraft shall provide containers or receptacles with tight-fitting covers in which the garbage shall be retained while within the territorial waters of, or on the land in, California pending incineration or approved treatment under the supervision and pursuant to the regulations of the director.