N.J. Stat. § 48:13-11
Every sewerage company organized under the laws of this State may lay its pipes and conduits beneath such public roads, streets, avenues and alleys as it may deem necessary for its corporate purposes, upon complying with the terms and conditions upon which the consent of the corporate authorities to the organization of the company shall have been obtained, provided that the consent to the laying of such pipes shall be obtained of any municipality through which the same may be laid.
Such pipes shall be laid at least 3 feet below the surface and shall not unnecessarily interfere with public travel or damage public or private property.
No consent shall be granted by the corporate authorities to such company to lay its pipes beneath such public roads, streets, avenues or alleys for the purposes aforesaid until a map and specifications of the proposed system of sewerage shall have been submitted to the State Department of Health and to the corporate authorities of any such municipality in which such system of sewerage is proposed, and the map and specifications shall have been approved by them.
N.J.S. § 48:13-11