The board of directors of a water development district shall consist of five, seven, or nine members. Those districts which have a population up to twenty-five thousand shall have five directors. Those districts which have a population of twenty-five thousand and one to seventy-five thousand shall have seven directors. Districts with a population greater than seventy-five thousand shall have nine directors. Each director shall be a resident and voter in the director area represented. The Board of Water and Natural Resources shall divide the water development district into director areas. A director shall be elected from each director area.
SDCL 46A-3B-2