Cal. Health & Safety Code § 25207.13

For purposes of complying with the manifest requirements of subdivision (b) of Section 25160, a county which collects banned, unregistered, or outdated agricultural wastes pursuant to this article shall be deemed to be the person who produced the hazardous waste, if the banned, unregistered, or outdated agricultural wastes collected by the county is labeled and no remedial or removal action is required.