California Code, Military and Veterans Code - MVC § 1173

By petition filed with the county clerk, registered electors residing within the boundaries of a proposed district, equal in number to at least eight per cent of the number of votes cast in the proposed district for the office of Governor at the last general election at which a Governor was elected, may propose the formation of a district. If both incorporated and unincorporated territory are included within the proposed district, the petition shall be signed by registered electors equal in number in each territory to at least 8 per cent of the votes so cast therein for Governor.