This paper discusses the pricing principles that could apply to the provision of backlog sewerage services and the key issues affecting the price determination for four priority sewer backlog areas in Sydney Water’s Operational Area. It also considers the provision of sewerage to existing unserviced developments at Fisherman’s Parade in Gosford City. These are outstanding determinations flowing from previous inquiries into Sydney Water and Gosford City Council, respectively. The pricing principles developed in this inquiry may be applied to some remaining sewer backlog areas within the operational areas of both Sydney and Hunter Water Corporations.