N.J. Stat. § 40A:31-19
A local unit or local units may authorize officials or other agents of the local unit or units to enter upon any land or water for the purpose of making surveys, studies, investigations or inspections, and, at reasonable hours, to enter any building or other structure using or suspected of using water supplied by the local unit or units. The officials or other agents are empowered to examine meters, service pipes or any equipment connected to the water supply facilities or service pipes for compliance with established standards and other requirements.
The supply of water to any property may be discontinued if the owner, lessee or other user of that property opposes or obstructs an authorized official or other agent in the performance of his duties. The discontinuance shall continue until the required investigations or inspections are made, and any alterations or repairs found to be necessary have been made and approved by the appropriate official or agent.
N.J.S. § 40A:31-19