N.J. Stat. § 58:14-10
The municipality making such request shall, in and by said resolution, agree to pay the commissioners the cost, not exceeding ten thousand dollars, of preparing the maps, plans, specifications and estimates so requested, and shall, at the time of making such request, pay as part of said expenses the sum of five thousand dollars to the commissioners. Such municipality, acting by the body or board having charge of its finances, may, at its discretion, by resolution, agree also to advance and pay to the commissioners for their use in making further investigations and preparing detail plans and specifications, moneys in installments or otherwise, not exceeding sixty thousand dollars, and if more than one municipality lying in whole or in part within the district agree to advance and pay moneys to the commissioners for said purposes, the amount of moneys so to be advanced and paid by said municipalities shall not exceed, in the aggregate, one hundred and fifty thousand dollars. Money so to be paid by a municipality may be appropriated and paid from any fund or balance not otherwise appropriated, and may be raised by temporary loans, notes or bonds, and shall be repaid to it, with interest at the rate of five per cent per annum, when the contract shall have been entered into for the building of said sewer, plant or works as hereinafter provided.
N.J.S. § 58:14-10