N.J. Stat. § 58:11-56
If any county, municipality, authority, commission, or other public body or agency owning, operating or controlling, separately or jointly, a public sewage treatment plant or the department finds that any person, corporation or municipality is discharging sewage into a public sewage treatment plant in violation of the provisions of this act or regulations promulgated thereunder, the said county, municipality, authority, commission, or other public body or agency, and the department, may in addition to any remedies provided under sections 6 and 7 of this act, take such steps as may be necessary to seal or close off such sewerage connections from the public sewage treatment plant until it is satisfied that adequate measures have been taken to prevent the recurrence of such violation.
N.J.S. § 58:11-56