N.J. Stat. § 58:14-27
Where any municipality party to the original contract has made an agreement to allot a portion of its capacity in said sewer to another municipality as provided by section 58:14-25 of this title, and such other municipality has a population of not less than five thousand nor more than ten thousand, the commissioners may enter into a contract with the latter municipality to pay its portion of the cost of operation and maintenance of said sewer, based on the amount of use thereof by the municipality. Upon the execution of such a contract, the municipality shall have the right to participate in the use and benefit of said sewer, but not in excess of the capacity allotted to it under said agreement, as provided for in said section 58:14-25, and the rights to the use and benefits of the sewer by the municipality making the allotment shall be decreased to the extent of the allotment so made. It shall not be necessary to have the consent of the municipalities that were parties to the original contract with the commissioners for the execution of such contract as is authorized by this section.
N.J.S. § 58:14-27