N.J. Stat. Ann. § 40:66A-31.8

After the commencement of operation of solid waste disposal facilities, the county may prescribe and change from time to time rates or rentals to be charged for the use of the services of such facilities. Such rates or rentals being in the nature of use or service charges or annual rental charges, shall be uniform and equitable for the same type and class of use or service of such facilities. Such rates or rentals and types and classes of use and service may be based on such factors as the board of chosen freeholders of the county shall deem proper and equitable.