If you are connected to public sewer, you will be billed for sewer fees. The sewer fees are based on water consumption of the previous year and are billed bi-annually. The first six-month payment is due April 15th, and the second six-month payment is due October 15th. There is a ten day grace period for payment of sewer bills. Any sewer fees remaining unpaid 9 (nine) calendar days following the due date are subject to interest, calculated at the same rate as property taxes.