N.J. Stat. Ann. § 40A:4-62

All moneys derived from the operation of publicly owned or operated utility or enterprise and any other moneys applicable to its support, shall be segregated by the local unit and kept in a separate fund which shall be known as "utility fund" and shall bear a further designation identifying the utility or enterprise and, except as provided in section 40A:4-35, shall be applied only to the payment of the operating and upkeep costs, and the interest and debt redemption charges upon the indebtedness incurred for the creation of such utility or enterprise.