Water Code § 75000
ARTICLE 1. Initiation of Proceedings
Whenever 1,000 or more of the holders of title or evidence of title of land within a district, as shown by the records of the county assessor, desire to form an improvement district within a district, they may propose the formation of such an improvement district by filing a petition with the board. The petition shall contain a statement of the plan of the proposed improvement district and a description of the boundaries thereof.