Water network

Every day, we supply over 1.5 billion litres of drinking water to homes and businesses. About 80% of it comes from Warragamba Dam. Sydney Desalination Plant at Kurnell is also supplying water to our network in a reduced capacity.

Find out more about desalination.

We treat your water at one of nine water filtration plants, or the desalination plant, and supply it through a network of:

  • 22,342 kilometres of pipes
  • 249 reservoirs
  • 150 pumping stations.

Read our  weekly water supply report to find out how much drinking water we've supplied recently.

Where does your water come from?

SWP [WaterSystem] Full schematic

We manage a complex network of pipes and reservoirs.

SWP [WaterSystem] [Icon] Catchments  Catchments

 Rivers drain water from the land around them. The surrounding land is called a river catchment. Our water network is supplied by a catchment area of over 16,500 km2.

SWP [WaterSystem] [Icon] Dams  Dams

Seven major dams store Sydney's water. Smaller dams also hold water that can be transferred to the major dams. WaterNSW manages our catchments and dams. 

SWP [WaterSystem] [Icon] Water filtration plants  Water filtration plants

WaterNSW supplies water from dams and we treat it at one of nine water filtration plants. We treat your water to a set of criteria called the Australian Drinking Water Guidelines. This ensures your water is high quality and safe to drink. 

SWP [WaterSystem] [Icon] Customer supply systems  Customer supply systems

After filtration, your water enters a complex series of pipes and reservoirs before it arrives at your home or business. Prospect Water Filtration Plant is the largest and most complex plant. It supplies water to about 80% of Sydney.

  SWP [WaterSystem] [Icon] Water filtration plants  Desalination plant

Sydney Desalination Plant helps to supply Sydney with water that is not reliant on rainfall. The plant uses special technology called reverse osmosis to turn seawater into drinking water. 

Always check your information. We've taken care in collecting and checking this information, but the supply and source of water can change due to customer demand.