The governing body of any city may, in the granting of a franchise to a private corporation furnishing water service to its inhabitants, in addition to the other provisions authorized by law, impose a provision in such franchise that the water corporation shall bill and collect sewer service charges lawfully established by the city, including a provision that the corporation shall discontinue water service to any customer using or required by law to use the sanitary sewer system of the city under stated conditions; and such a corporation shall have authority to collect such charges and to discontinue water service as provided in the franchise. The franchise shall not require the billing and collecting of such sewer service charges without making provision for payment by the city to the water corporation of such compensation as shall reimburse the corporation for its expenses in billing and collecting such sewer service charges: Provided, That no obligation shall be imposed on the water corporation to bring any action at law to enforce collection of such charges.