N.J. Stat. Ann. § 40:66-9

The governing body of any municipality which operated a solid waste collection district as of December 31, 1989, may provide by municipal contract or municipal service for the collection or disposal of solid waste within a solid waste collection district, subject to the approval of the Local Finance Board of the Department of Community Affairs and subject to the provisions of the "Local Public Contracts Law," P.L.1971, c.198 (C.40A:11-1 et seq.).