The petition shall be substantially in the following form:

The secretary of the ____ Water District having heretofore certified to the board of directors of the district that at least 50 percent of the assessable area within the district is devoted to and developed for residential, industrial, or nonagricultural commercial use, or any combination thereof, the undersigned voters who reside within the boundaries of ____ Water District hereby petition the board of directors thereof to hold all elections on the basis of resident voting district, rather than a landowner voting district.