The Commission may contract with the Howard County Department of Public Works for the maintenance and operation of parts of the Howard County Department of Public Works’ water system that are supplied from the Commission’s water system. If the contract under subsection (a) of this section requires the Commission to maintain and operate parts of the Howard County Department of Public Works’ water system: the operating control of those parts of the Howard County Department of Public Works’ water system belongs exclusively to the Commission; and the Commission shall collect fees and charges incident to the maintenance and operation of the water system or the use of water in accordance with § 25–504(b), (c), and (d) of this article.