Cal. Food & Agric. Code § 72109

Any person, firm, or corporation subject to the assessment in this chapter may request a total or partial refund of a paid assessment from the commission. No refund shall be made by the commission unless requested within 90 days from the date of collection of the assessment. However, the commission may extend that period upon a showing of good cause. The refund of assessment shall be made by the commission within 60 days of the date of the request for the refund. The commission shall establish procedures and provide forms for each request, shall maintain complete records, and shall ensure confidentiality.