Nebraska Revised Statute 17-925.03
17-925.03. Sewers; rental charges; reduction in taxes.
The revenue from such charges shall only be used for the abatement or the reduction of ad valorem taxes being levied or to be levied for the payment of bonds outstanding or to be issued for the construction of or additions to such sewerage system.
Laws 1947, c. 43, § 2, p. 159.