Rates and charges for domestic waste water disposal service shall be $1.81 per 100 cubic feet of the average amount of water used in the months of November, December and January and billed starting in February and each subsequent month of the year at that calculated amount. Each month a standard service charge is added to the bill. The service charge is based on the size of the water meter line. The sewer charge remains constant for one year. See the table below for corresponding fixed service fee for water meter diameter.