N.J. Stat. Ann. § 40:23-6.27

Any such contract shall be and remain in force for such term not exceeding 10 years as shall be provided therein and no provision of any law requiring advertisement for bids before the making of any contract involving the expenditure of money shall be applicable to the making of any such contract between the county and the municipality or municipalities, but any contract entered into by the county for services or facilities to be provided to a municipality or municipalities shall be advertised and awarded in accordance with chapter 25 of Title 40 of the Revised Statutes.