Any municipality included within the area comprising a proposed water development district shall constitute a separate election district. That area of any county wholly or partially included in a proposed water development district, and which is outside the corporate limits of a municipality, shall also constitute a separate election district. No election district may become a part of any water development district unless sixty percent or more of the votes cast by the voters of such election district shall be in favor of the proposed water development district.
SDCL 46A-3A-13