N.J. Stat. § 40:62-109
The governing body of two or more municipalities in which water is supplied for domestic and public use by privately owned waterworks, whether such waterworks are owned by one or more persons, may make application to the Superior Court for the appointment of a commission to acquire by purchase or condemnation such waterworks with all rights and franchises relating thereto, and the rights and franchises to obtain an additional supply of water, and any or all other property of the owner of such waterworks as may be necessary to maintain, operate, enlarge or extend the waterworks so acquired, and to enlarge, extend, maintain and operate the same to supply water in the municipalities acquiring such waterworks as aforesaid and all other municipalities theretofore supplied with water by said waterworks.
All of the municipalities so supplied with water shall be notified in writing of such application at least sixty days before it is made, and may join therein.
N.J.S. § 40:62-109