All water charges shall become due and payable at the office of the finance department on the date of presentation of a utility bill and shall become delinquent thirty days after the date of the bill. Meters will be read at regular intervals for the preparation of regular metered service bills as determined by resolution, and as required for the preparation of opening bills, closing bills and special bills. Each meter will be read separately. It may not always be possible to read meters regularly on the same day of each billing period. Proportionate adjustments will be made when other billing periods or portions of billing periods are used. (Ord. 1940 NCS §2 (part), 1993; Ord. 544 NCS §5; prior code §27.48.)