N.J. Stat. Ann. § 40:62-119

If the commission and the owner cannot agree upon the price to be paid for all the additional property, rights and franchises, including betterments, additions and extensions as aforesaid, prior to taking possession thereof, then within thirty days after taking possession, the fair value thereof as part of the waterworks condemned at the time possession thereof is taken by the commission shall upon the application of either the owner or the commission be determined pursuant to the provisions of chapter one of Title 20 of the Revised Statutes, except that the supplemental condemnation covering the after acquired property shall not be abandoned without the written consent thereto of the owner. The amount so determined as the price to be paid by the commission for the additional property, rights and franchises shall be a lien upon all the waterworks, rights and franchises so acquired by the commission until paid.