N.J. Stat. Ann. § 40:62-105.37

The township committee of any township in which there shall have been created a water district may be ordinance enlarge any such water district by extending the boundaries thereof to include therein as part thereof additional lands situate within the township and not then being within the boundaries of any water district. Such action shall not be taken until at least ten freeholders of the portion of the township proposed to be included within the extended boundaries of such water district shall first make application in writing to the township committee for the adoption of such ordinance. Such application shall set forth the boundaries of the land proposed to be added to such water district.