Cal. Food & Agric. Code § 6221

If the board of supervisors determines that the petition does not comply with the requirements of law, the matter may be dismissed without prejudice to present a new petition covering the same matter. A finding by the board of supervisors in favor of the sufficiency of the petition and notice is final and conclusive against all persons except the state in a proceeding brought by the Attorney General within one year of the date of the making of the order establishing and describing the boundaries of the district.