Building on water recycling projects already underway, the City has selected a consortium to develop a Decentralised Water Master Plan to dramatically reduce demand for mains water.
Sustainable Sydney 2030 sets a target of sourcing 10 percent of the City's water supply from within our own boundaries, and to help us get there the Decentralised Water Master Plan will examine the costs and benefits of a city-wide recycled water network, outline water efficiency measures to reduce consumption; identify ways to collect more water locally; and explore different business models to implement the Plan.
Currently, the City imports 32 gigalitres of drinking water into the local government area each year, most of which is used in apartments, commercial and institutional buildings. It is estimated that 80 per cent of this water could be replaced by recycled water including for toilet flushing, laundry uses, air conditioning cooling towers and irrigation.
The City's proposed recycled water network, the first of its kind Australia, would allow building owners to both take recycled water from, and supply recycled water to, the network with possible sources of recycled water already identified including treated stormwater, treated grey water (from kitchens and laundries), and cleaned, disinfected black water from sewers.
As well as reducing drinking water consumption across the City, the Plan will guide our work to better control stormwater and stormwater run-off during heavy rain events, limiting localised flooding.
The consortium, comprising engineering consultants GDH, the University of Technology's Institute for Sustainable Futures, and public private partnership consultants P3iC, will also look at regulatory barriers that may prevent or limit the implementation of a city-wide water recycling network, and will identify additional projects and programs that will ultimately help us achieve our target of reducing pollutants entering our waterways by 50 percent.