Water network

Every day, we supply over 1.4 billion litres of drinking water to homes and businesses. About 80% of it comes from Warragamba Dam.

Sydney Desalination Plant at Kurnell can also supply water to up to 1.5 million people.

How much water do we supply?

We measure how much drinking water we supply from our water filtration plants each day.

Read the weekly water supply report.

Your water is treated at one of nine water filtration plants. We then supply it to you through a network of:

  • over 21,635 kilometres of water pipes
  • 242 reservoirs
  • 150 pumping stations.

Enter your postcode below to find out:

  • where your water is treated
  • which water system supplies water to your property.

Where does my 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 during drought. It uses special technology called reverse osmosis to turn seawater into drinking water. The plant is not currently supplying any 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.