How water is delivered to your property
While we've taken all care to provide you with accurate information on how we deliver water to your property, there may be times when you receive water from other water delivery systems in our network.
Where does your water come from?
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- Potts Hill Water Delivery system
- Woronora Water Delivery system
Illawarra Water Delivery System
The Illawarra Water Delivery System supplies about 300,000 people in the Wollongong, Shellharbour and Kiama local government areas.
WaterNSW sources raw water from the Avon River.
They can also transfer extra water from the Nepean River through the Nepean Tunnel or from the Shoalhaven River System, coming from as far as Braidwood.
WaterNSW stores your water behind Avon Dam. The Avon River forms a 10.5 km2 lake behind the dam. When full, Lake Avon holds 146,700 ML.
To find out how much water is behind Avon Dam now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Veolia Water owns and operates the Illawarra Water Filtration Plant, which can treat up to 210 ML a day. They screen and filter the water, before adding chlorine and fluoride to meet the guidelines.
The plant includes a hydro-electric plant which can export renewable energy back to the grid.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed, to ensure you have enough pressure at your tap.
We send water to your local reservoir, which is one of 37 reservoirs in the Illawarra Water Delivery System.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Prospect North Water Delivery System
The Prospect North Water Delivery System supplies about 670,000 people in the Hills Shire, Blacktown, Parramatta, Cumberland, Hornsby and Ku-Ring-Gai local government areas.
This system can supply water to the Ryde Water Delivery System when needed.
WaterNSW sources raw water from various rivers. They provide us with raw water from the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers, which all flow into Warragamba Dam.
They can also supply us with raw water from the Cataract, Cordeaux, Avon and Nepean rivers when needed.
During drought, they can transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake holds, 2,027,000 ML of water – about four times as much as Sydney Harbour.
Some water also comes from Cataract, Cordeaux, Avon and Nepean dams via Broughtons Pass and the Lower Canal.
To find out how much water is in the dam now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Water from the various dams combines at Prospect Water Filtration Plant at Prospect Reservoir.
SUEZ owns and operates Prospect Water Filtration Plant. This is the largest water filtration plant in our network, treating 85% of Sydney's water.
They screen and filter up to 3,000 ML of water a day, before adding chloramine and fluoride to meet the guidelines.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We send water to your local reservoir, which is one of 36 reservoirs in the Prospect North Water Delivery System.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Macarthur Water Delivery System
The Macarthur Water Delivery System supplies about 290,000 people across the Wollondilly, Campbelltown, Camden and Liverpool local government areas.
WaterNSW sources raw water mainly from the Cataract and Cordeaux rivers. They can also source water for this system from the Nepean and Avon rivers.
During drought, they can also transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores your water mainly behind Cataract and Cordeaux dams. Cataract and Cordeaux combined hold 190,830 ML when full.
We can also source water from behind Nepean and Avon dams which can hold another 214,430 ML.
To find out how much water is in the dams now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
We extract water at Broughtons Pass Weir and screen it before transferring it to the Macarthur Water Filtration Plant.
Macarthur Water Filtration Plant is owned and operated by Trility. They screen and filter up to 265 ML of water a day, before adding chloramine and fluoride to meet the guidelines.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We send water to your local reservoir, which is one of 17 reservoirs in the Macarthur Water Delivery System.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Warragamba Water Delivery System
The Warragamba Water Delivery System supplies water to about 8,700 people in the Penrith, Liverpool and Wollondilly local government areas.
WaterNSW sources raw water from various rivers. They provide us with raw water from the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers.
During drought, they can also transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake behind holds 2,027,000 ML of water – about four times as much as Sydney Harbour.
To find out how much water is in the dam now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Sydney Water owns and operates Warragamba Water Filtration Plant.
We screen and filter up to 14 ML of water a day, before adding chlorine and fluoride to meet the guidelines.
We send water to your local reservoir, which is one of four reservoirs in the Warragamba Water Delivery System.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Nepean Water Delivery System
The Nepean Water Delivery System supplies about 22,000 people in the Wollondilly local government area.
WaterNSW sources raw water from the Nepean River.
During drought, they can also transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores your water behind Nepean Dam.
The Nepean River forms a 3.3 km2 lake behind the dam. When full, Nepean Lake holds 67,730 ML.
To find out how much water is in the dam now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Sydney Water owns and operates Nepean Water Filtration Plant.
We screen and filter up to 28 ML a day before adding chlorine and fluoride to meet the guidelines.
We send water to your local reservoir, which is one of nine reservoirs in the Nepean Water Delivery System.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Orchard Hills Water Delivery System
The Orchard Hills Water Delivery System supplies water to about 240,000 people in the Penrith, Blue Mountains and Hawkesbury local government areas.
This system is interconnected with the Cascade Water Delivery System.
Under normal operation, the Cascade Water Delivery System extends partly into the Orchard Hills Water Delivery System using gravity. But in an emergency, such as a bushfire, we can reverse the supply to pump extra water up into the Blue Mountains.
WaterNSW sources raw water from various rivers. They provide us with water from the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers.
During drought, they can transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake holds 2,027,000 ML of water – about four times as much as Sydney Harbour.
To find out how much water is in the dam now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Sydney Water owns and operates Orchard Hills Water Filtration Plant. We screen and filter up to 173 ML of water a day, before adding chlorine and fluoride to meet the guidelines
We send water to your local reservoir, which is one of 17 reservoirs in the Orchard Hills Water Delivery System.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Cascade Water Delivery System
The Cascade Water Delivery System supplies about 49,500 customers in the Blue Mountains local government area.
The Cascade Water Delivery System is interconnected with the Orchard Hills Water Delivery System.
Under normal operation, the Cascade Water Delivery System extends partly into the Orchard Hills Water Delivery System using gravity. But in an emergency, such as a bushfire, we can reverse the supply to pump extra water up into the Blue Mountains.
WaterNSW sources raw water from various rivers and creeks. They provide us with water from Adams Creek, Greaves Creek and Cascade Creek.
They can also supply water from the Fish or Duckmaloi rivers through the Fish River Scheme if needed.
WaterNSW stores your water behind the Blue Mountains dams.
We draw water from behind the Upper Cascade Dam, which receives water from behind Middle and Lower Cascade dams, Greaves Creek Dam, and Medlow Dam. These dams have a combined capacity of 2,890 ML.
To find out how much water is in the Blue Mountains dams now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Sydney Water owns and operates the Cascade Water Filtration Plant.
We screen and filter up to 37 ML of water a day, before adding chlorine and fluoride to meet the guidelines.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We send water to your local reservoir, which is one of 18 reservoirs in the Cascade Water Delivery System.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
North Richmond Water Delivery System
The North Richmond Water Delivery System supplies about 48,000 people in the Hawkesbury local government area.
We draw raw water direct from the Hawkesbury-Nepean River at North Richmond. North Richmond is the only water delivery system in Sydney that doesn't source water from behind a dam.
We treat all of the water we supply to meet the Australian Drinking Water Guidelines.
Sydney Water owns and operates North Richmond Water Filtration Plant. The treatment process varies, depending on water quality conditions in the river, which can also affect how much water we can treat. We treat from 14 to 50 ML of water a day.
We may allow sediment in the water to settle out in the clarifier or, if the river has algal blooms, we direct the water through our Dissolved Air Flotation plant.
We then filter the water through sand and anthracite filters and then through granulated activated carbon filters to reduce odours and improve taste. We add chlorine and fluoride to meet the guidelines.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We send water to your local reservoir, which is one of 11 reservoirs in the North Richmond Water Delivery System.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Ryde Water Delivery System
The Ryde Water Delivery System supplies over 665,000 people across the Parramatta, Ku-Ring-Gai, Ryde, Hunters Hill, Lane Cove, Willoughby, North Sydney, Mosman, and Northern Beaches local government areas.
We regularly supplement the Ryde Water Delivery System with water from the Prospect North Delivery System.
WaterNSW sources raw water from various rivers. They provide us with water from the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers.
They can also supply us with raw water from the Cataract, Cordeaux, Avon and Nepean rivers when needed.
During drought, they can transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake holds, 2,027,000 ML of water – about four times as much as Sydney Harbour.
Some of your water comes from Cataract, Cordeaux, Avon and Nepean dams via Broughtons Pass and the Lower Canal.
To find out how much water is in the dams now, you can check Greater Sydney's dam levels.
We treat all of the water we supply to meet the Australian Drinking Water Guidelines.
Water from the various dams combines at Prospect Water Filtration Plant at Prospect Reservoir.
SUEZ owns and operates Prospect Water Filtration Plant. This is the largest water filtration plant in our network, treating 85% of Sydney's water.
They screen and filter up to 3,000 ML of water a day, before adding chloramine and fluoride to meet the guidelines.
We send water to your local reservoir, which is one of 34 reservoirs in the Ryde Water Delivery System.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Prospect East Water Delivery System
The Prospect East Water Delivery System supplies a fast-growing population of over 210,000 people across the Parramatta, Cumberland, Canterbury-Bankstown, Fairfield and Liverpool local government areas.
WaterNSW sources raw water from various rivers. They provide us with water from the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers.
They can also supply us with raw water from the Cataract, Cordeaux, Avon and Nepean rivers when needed.
During drought, they can transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake holds, 2,027,000 ML of water – about four times as much as Sydney Harbour.
Some of your water comes from Cataract, Cordeaux, Avon and Nepean dams via Broughtons Pass and the Lower Canal.
To find out how much water is in the dams now, you can check Greater Sydney's dam levels.
We treat all of the water we supply to meet the Australian Drinking Water Guidelines.
Water from the various dams combines at Prospect Water Filtration Plant at Prospect Reservoir.
SUEZ owns and operates Prospect Water Filtration Plant. This is the largest water filtration plant in our network, treating 85% of Sydney's water.
They screen and filter up to 3,000 ML of water a day, before adding chloramine and fluoride to meet the guidelines.
To save energy, we use gravity to deliver water where possible. Most of the Prospect East Water Delivery System is supplied by gravity from Prospect Water Filtration Plant. We pump the water when needed to ensure you have enough pressure at your tap.
Some water also travels by gravity to Pipehead at Guildford from where water is pumped to the Ryde Water Delivery System. The rest is supplied via two reservoirs in Milperra and Holroyd.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Prospect South Water Delivery System
The Prospect South Water Delivery System supplies about 375,000 people across the Campbelltown, Liverpool, Blacktown and Wollondilly local government areas.
We can supply water to the Prospect South Water Delivery System from the Prospect North Water Delivery System
WaterNSW sources raw water from various rivers. They provide us with water from the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers.
They can also supply us with raw water from the Cataract, Cordeaux, Avon and Nepean rivers when needed.
During drought, they can transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake holds, 2,027,000 ML of water – about four times as much as Sydney Harbour.
Some of your water comes from Cataract, Cordeaux, Avon and Nepean dams via Broughtons Pass and the Lower Canal.
To find out how much water is in the dams now, you can check Greater Sydney's dam levels.
We treat all of the water we supply to meet the Australian Drinking Water Guidelines. Water from the various dams combines at Prospect Water Filtration Plant at Prospect Reservoir.
SUEZ owns and operates Prospect Water Filtration Plant. This is the largest water filtration plant in our network, treating 85% of Sydney's water.
They screen and filter up to 3,000 ML of water a day, before adding chloramine and fluoride to meet the guidelines.
We send water to your local reservoir, which is one of 13 reservoirs in the Prospect South Water Delivery System.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Woronora Water Delivery system
The Woronora Water Delivery System supplies about 100,000 people in the Sutherland Shire and northern parts of the Wollongong local government area.
Only the area around Helensburgh down to Stanwell Park receives water solely from Woronora.
Other suburbs receive a mix from the Woronora Water Delivery System and the Potts Hill Water Delivery System. The Potts Hill Water Delivery System can include desalinated water when needed.
Sourcing your water
WaterNSW sources raw water from the Woronora River. They can also provide water indirectly from the rivers that supply the Potts Hill Water Delivery System.
WaterNSW stores your water behind Woronora Dam.
The Woronora River forms a 4 km2 lake behind the dam. When full, this lake holds 71,790 ML.
To find out how much water is behind Woronora Dam now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Veolia Water owns and operates the Woronora Water Filtration Plant which can treat up to 160 ML a day.
They screen and filter the water, before adding chloramine and fluoride to meet the guidelines.
We can supplement the Woronora Water Delivery System (except Helensburgh to Stanwell Park) from the Potts Hill Water Delivery System. During drought, this may include water sourced from the ocean, via Sydney Desalination Plant.
Sydney Desalination Plant draws water from about 300 m offshore and 25 m below the ocean surface.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
When required, Sydney Desalination Plant screens ocean water through large rotating screens and then filters it. High pressure pumps then force the water through reverse osmosis membranes.
Minerals and fluoride are added and water is chlorinated to meet the guidelines.
During drought, when Sydney Desalination Plant is operating, we may supply desalinated water to the Sutherland Shire and directly into the City Tunnel at Erskineville via Potts Hill Water Delivery System.
The desalinated water mixes with the treated river water. How much desalinated water you receive depends on the demand for water across the network.
We send water to your local reservoir, which is one of 14 reservoirs in the Woronora Water Delivery System.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.
Potts Hill Water Delivery System
The Potts Hill Water Delivery System supplies water to about 1.5 million people across the Cumberland, Canada Bay, Inner West, Sydney, Woollahra, Waverly, Randwick, Bayside, Burwood, Strathfield, Canterbury-Bankstown, Georges River and Sutherland Shire local government areas.
When needed, the system may include water from Sydney Desalination Plant.
This system is interconnected with the Woronora Water Delivery System.
Sourcing your water
WaterNSW sources raw water from various rivers. These include the Coxs, Kowmung, Nattai, Wingecarribee, Wollondilly and Warragamba rivers.
They can also draw water from the Cataract, Cordeaux, Avon and Nepean rivers if needed.
During drought, they can transfer water from the Shoalhaven River System, from as far as Braidwood.
WaterNSW stores 80% of Greater Sydney's water in Lake Burragorang, behind Warragamba Dam. When full, the lake holds 2,027,000 ML of water – about four times as much as Sydney Harbour.
Some water also comes from Cataract, Cordeaux, Avon and Nepean dams via Broughtons Pass and the Lower Canal.
To find out how much water is in the dams now, you can check Greater Sydney's dam levels.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Water from the various dams combines at Prospect Water Filtration Plant at Prospect Reservoir.
SUEZ owns and operates Prospect Water Filtration Plant. This is the largest water filtration plant in our network, treating 85% of Sydney's water.
They screen and filter up to 3,000 ML of water a day, before adding chloramine and fluoride to meet the guidelines, before supplying the water to Potts Hill reservoirs.
During drought, the Potts Hill Water Delivery System includes water sourced from the ocean via Sydney Desalination Plant.
Sydney Desalination Plant draws water from about 300 m offshore and 25 m below the ocean surface.
We treat all the water we supply to meet the Australian Drinking Water Guidelines.
Sydney Desalination Plant screens ocean water through large rotating screens and then filters it.
High pressure pumps then force the water through reverse osmosis membranes. Minerals, fluoride and chlorine are added to the water.
These tunnels carry water 16 km from Potts Hill reservoirs to a pumping station at Waterloo.
When Sydney Desalination Plant is operating, we add the desalinated water directly into the City Tunnel at Erskineville. It mixes with river water for supply to the City and Eastern suburbs.
How much desalinated water you receive depends on the demand for water across our network.
Potts Hill reservoirs supply the City and Pressure tunnels and 34 other reservoirs.
To save energy, we use gravity to deliver water from your local reservoir where possible. We pump the water when needed to ensure you have enough pressure at your tap.
We test your water from source to tap to ensure you have safe drinking water.
Once the water arrives at your property, it travels through your water meter to measure how much water you use.
The used water goes down your sinks, drains and toilets and joins the local wastewater network before it is treated at one of our wastewater treatment or water recycling plants.