An authority may use data that a political subdivision furnishes under this section to calculate the rates, fees, and charges of the authority for sewer services to a consumer of water. By the 15th day of the month after the month in which the political subdivision issues water bills, and at the request of the authority, each member political subdivision shall submit to the authority: A list of the water meter readings on which the water bills were based; or A statement of the amounts of the water bills.