Neb. Rev. Stat. § 14-365.09: Neb. Rev. Stat. § 14-365.09

The owner of any sewerage system, including any storm sewer system, or sewage disposal plant provided for in sections 14-365.01 to 14-365.08 , or any city of the metropolitan class, is authorized to extend such sewerage system beyond the corporate limits of the city, under the same conditions, as nearly as may be, as within such corporate limits, and to charge to users of its services reasonable and fair rates consistent with those charged or which might be charged within such corporate limits and consistent with the expense of extending and maintaining such sewerage system outside such corporate limits at a fair return to the owner of such sewerage system. The mayor and city council shall have the authority to enter into contracts with users of such sewerage system, including any storm sewer system, except that no such contract shall call for furnishing of such service for a period in excess of ten years.