N.J. Stat. § 40:63-114
The joint meeting shall at all times keep full and accurate account of its receipts, expenditures, disbursements, assets and liabilities and an itemized or detailed statement in writing to be approved by such joint meeting and signed by the chairman and secretary, and countersigned by the treasurer thereof, shall be made and rendered at least once in each month, to each municipal body or board in its corporate name, represented in the joint meeting. The itemized or detailed statement shall include all moneys expended, all obligations incurred since the date of the last preceding statement in or about such public improvement or works, or in anywise connected therewith, and shall set forth the amount, the date when payable, name of person to whom and for what payable, the total sum paid or to be paid by each of such municipalities pursuant to the percentage fixed in the contract between them, and such other matters as the joint meeting may deem advisable or important to include therein.
N.J.S. § 40:63-114