N.J. Stat. Ann. § 40A:65-9

9. If any local unit performs a service on behalf of one or more other local units that are parties to an agreement that utilizes a private contractor to perform all or most of that service, or all or most of a specific and separate segment of that service, then that local unit shall award the contract for the work to be performed by a private contractor under the agreement in accordance with the "Local Public Contracts Law," P.L.1971, c.198 (C.40A:11-1 et seq.).