Section 159.18 - Collection of charges(1) Any municipality shall have power to discontinue and shut off the supplying of any or all water, gas and sewer services to any users of the facilities of a water system, gas system or sewer system of such municipality for nonpayment of service charges for any such water system, gas system or sewer system, and may covenant with the holders of any revenue bonds issued hereunder that it will not restore the supplying of any water, gas or sewer services to such delinquent users until all charges, with reasonable interest and penalties, for all water, gas and sewer services have been paid in full.(2) Any municipality shall have power to enter into valid and legally binding contracts with any person, public or private corporation, board or other body supplying water to any premises served by the sewer system or facilities of the municipality for the shutting off and discontinuing of the supply of water to such premises as long as any charges for the sewer services or facilities of the municipality are unpaid, under such terms and conditions as shall be mutually agreed upon, including provisions for the billing and collecting of the sewer charges of the municipality by the owners of the water facilities at the same time water charges are billed and collected by such owners of the water facilities.