Water rates will be charged to customers on a monthly basis, and bills shall be payable upon receipt. Charges unpaid after thirty days shall incur interest penalty at the highest rate then permitted by law. The city shall have a lien on delinquent and unpaid charges for water, enforceable as provided by law. Whenever a city water customer is over sixty days delinquent in payment of its water bill, then the city shall undertake all acts necessary to disconnect service to that customer. The sixty days provided for in this section shall be calculated from the date that the bill is due, provided, however, that at least ten calendar days prior to the date on which the city intends to disconnect service, the city shall forward to the customer a notice advising of the city’s intent to disconnect service for nonpayment. Any notice sent to a customer advising of the intent to disconnect service shall inform the customer that in addition to the outstanding bill that would have to be paid in order to restore water service following disconnection, the customer will be charged a one hundred dollar connection fee in order to reconnect service. The cost of sending said notice shall be $10.00 plus the cost of sending a United States Postal Service Certified Letter. The same notice shall also advise the customer of the right to contest the validity of the bill, as well as the date on which payment must be made in order to avoid disconnection of service. Any writing which is forwarded to the customer shall contain a copy of the delinquent bill.