Cal. Food and Agricultural Code § 6233

(a) From and after the filing for record of the order of the board of supervisors declaring the district organized, and the appointment and qualification of its first board of directors, the organization of the district is complete. The district shall operate for a period of five years from the date of its organization, and shall cease to exist after five years unless the district is reauthorized and approved by the board of supervisors. (b) The board of directors shall hold a public hearing six months prior to termination of its initial organization or last reauthorization to determine whether the conditions of the phylloxera or other pest or disease determined pursuant to Section 6214 warrant the reauthorization of the district for an additional five years. The notice of hearing shall state the name of the district and that consideration is being given to reauthorizing the district for an additional five years, the boundaries of the district, and the time and place for the hearing. Notice of the hearing shall be given as provided in Sections 6217 and 6218. The board of directors shall submit the record of the hearing and its recommendation to the board of supervisors within 90 days of the hearing. The board of supervisors shall approve or reject the recommendation; if it rejects the recommendation, the board of supervisors shall return the report accompanied by its reasons for the rejection to the board of directors within 30 days of receipt. The board of directors may thereafter address the reasons for rejection by the board of supervisors and submit an amended report and new recommendations for reauthorization for approval or rejection by the board of supervisors, unless the district has ceased to exist pursuant to subdivision (a).