All charges for sewer service furnished by the City shall become due when billed and shall be delinquent on the 21st day after each payment becomes due. Statements for sewer service by the City shall be delivered to the consumer or owner of the premises by leaving at the premises or by mailing to the owners of the premises or the consumers, and the City shall retain all billing records. Such statement shall designate the reading of the water meter, and the previous reading thereof, from which shall be computed the number of gallons discharged and the amount due for sewer charges against the premises. A penalty of 10% of the amount due shall be added to each statement, but if the same is paid on or before the 20th day after the account becomes due, such penalty shall not be collected. Whenever practicable, all charges owing hereunder shall be billed in the same manner and at the same time as water customer under Ch. 52, Water, of the Columbus City Code. Failure to receive a statement of the amount due shall not excuse the owner of the premises or the consumer from the liability to pay for all sewer charges or for the penalty for failure to pay before the same becomes delinquent. It shall be the duty of the Customer Service Office to be open each business day for the purpose of receiving payment of water and sewer accounts. It shall also be the duty of the Customer Service Office to keep an accurate record of all monies received, entering the same to the credit of the proper department for which it is received. All monies so received shall be deposited with the Treasurer and the City Clerk shall report to the City Council at the first regular meeting of each month the monies received during the preceding month. Sewer charges made by this subchapter shall be rendered as for water service of the City and all charges levied by this subchapter which are not paid at or before water service charges of the City are required to be paid shall be deemed delinquent and the water service of such customer may be discontinued.