N.J. Stat. Ann. § 58:14-34.28

Before entering into any such agreement the commissioners shall hold a public hearing at which time opportunity shall be afforded the remaining contracting agencies to present objections and suggestions with reference to the proposed agreement, and if it shall appear that the contracting agencies, representing more than 75% of the remaining allowed capacity in the commissioners' facilities, object to said agreement, the commissioners shall not enter into it. Notice of said public hearing with the relative information and data shall be mailed to each contracting agency at least 20 days before the date set for the hearing. L.1962, c. 31, s. 3.