Neb. Rev. Stat. § 14-2134

In addition to any and all powers granted to cities of the metropolitan class and metropolitan utilities districts within and serving such cities, a city of the metropolitan class may enter into a contract with the metropolitan utilities district within its area in order to obtain the use of facilities and services of the water utility of such a district and in order to collect all or any part of a sewer use or rental fee or all or any part of a garbage and refuse removal, disposal, or recycling fee which such city may lawfully be entitled to charge and collect.