Both SC and TES are calculated based on water consumption.  The charges are included in the demand notes issued by the Water Authority covering the water charges, SC and TES to facilitate payment. The demand notes are issued once every four months for most consumers. For consumers using a large amount of water, the bills are issued once a month.

According to the Sewage Services Ordinance, a 5% overdue surcharge may be imposed on account with outstanding payment after the due date of the bill. Reminder bills will be issued to both the mailing and services addresses of the overdue accounts. Subsequent to the issue of reminder bills, the Water Authority may disconnect the water supply to the premises with default payment without prior notice. A 10% overdue surcharge may be imposed on top of the outstanding amount six months after the original due date of the bill.