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 21,000 kilometres of water pipes
  • 251 reservoirs
  • 164 pumping stations.


Enter your postcode below to find out where your water is treated and which water system supplies water to your property.

Legend
SWP [WaterSystem] [Icon] Catchments Catchments

A catchment is an area of land where water can run into one of the major water supply dams when it rains. This water comes from rivers, creeks and streams. Our water network is supplied by a catchment area of over 16,500 km2. We sample water quality from many of the rivers and streams (inflows) that carry water from the catchments.

SWP [WaterSystem] [Icon] Dams Dams

Seven major dams store Sydney's water. Secondary storage dams also hold water that we can transfer to the major dams. Storing water in dams allows time for many of the contaminants that may be in the water as it runs through the catchments to settle out. Sydney Catchment Authority is responsible for the catchments and dams.


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

We take water from the dams and treat it at one of nine water filtration plants. The plants are designed to remove any remaining contaminants. We treat your water to a set of criteria called the Australian Drinking Water Guidelines to ensure the water is high quality and safe to drink.

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

After leaving a filtration plant, water enters a complex series of pipes and reservoirs before it arrives at your home or business. Each plant may supply one or more customer supply systems. 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 uses reverse osmosis technology to extract fresh water from seawater. After screening and pre-treatment to remove any solids and sediment, the water is pushed through membranes under high pressure. Fresh water passes through the membranes and the remaining seawater concentrate is returned to the ocean. The water is then treated to meet the Australian Drinking Water Guidelines to ensure it is high quality and safe to drink.

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.