Lower South Creek Treatment Program

Making the most of Sydney’s North-West’s wastewater

Sydney’s North-West is a great place to live and work. And it’s predicted by 2040 that an additional half a million people will discover this area really is the place to be.

This population growth means we need the right infrastructure and support in place to go about our everyday – like well-located housing, roads and public transport and additional utility infrastructure including telecommunications, energy and water.

Increasing the capacity of our current wastewater treatment system is the focus for our Lower South Creek Treatment Program (LSCTP). The Program involves upgrading the facilities at Riverstone, St Marys and Quakers Hill. These upgrades, approved by NSW Treasury to the value of around $450 million, will see us adopt new technologies that will make the water treatment process more sustainable, cost efficient and effective.


For most of us, we probably don’t think too much about where our wastewater goes. We flush the toilet and the water disappears. But for the LSCTP team, they are focused on making sure that every drop will be redirected in the right way and to the best place.

It’s quite an involved process – going through three levels of treatment to remove waste. The great thing is we can produce biosolids (organic matter) from the sludge and scum, which can be used for fertiliser, composting or landscaping. And we filter the water before returning it back into the environment.


Incorporating new technology to improve our wastewater treatment process

We’ve been busy introducing new technology like installing a thermal hydrolysis plant (THP) at St Marys to make our current wastewater treatment process more energy efficient and cost effective.

THP will apply high pressure and temperature to break down the sludge’s organic matter into smaller and more digestible compounds. This process will produce an increased amount of biogas, a source of renewable energy. The increased volume of biogas will help reduce St Marys’ energy costs by producing more renewable electricity onsite. A real win-win!

The new plant will also significantly reduce the truck movements to dispose of large quantities of solids. This means less noise in the community and a smaller carbon footprint.

We are always looking ahead to find new ways to ensure we are delivering great infrastructure for the residents of Sydney’s North-West. Stay tuned for more updates.


Any queries

We appreciate your patience during this important work and will continue to keep you informed. If you have any questions about the Lower South Creek Treatment Program, please contact the Community Relations Team on 1800 870 767 or lowersouthcreek@sydneywater.com.au

Making the most of Sydney’s North-West’s wastewater

Sydney’s North-West is a great place to live and work. And it’s predicted by 2040 that an additional half a million people will discover this area really is the place to be.

This population growth means we need the right infrastructure and support in place to go about our everyday – like well-located housing, roads and public transport and additional utility infrastructure including telecommunications, energy and water.

Increasing the capacity of our current wastewater treatment system is the focus for our Lower South Creek Treatment Program (LSCTP). The Program involves upgrading the facilities at Riverstone, St Marys and Quakers Hill. These upgrades, approved by NSW Treasury to the value of around $450 million, will see us adopt new technologies that will make the water treatment process more sustainable, cost efficient and effective.


For most of us, we probably don’t think too much about where our wastewater goes. We flush the toilet and the water disappears. But for the LSCTP team, they are focused on making sure that every drop will be redirected in the right way and to the best place.

It’s quite an involved process – going through three levels of treatment to remove waste. The great thing is we can produce biosolids (organic matter) from the sludge and scum, which can be used for fertiliser, composting or landscaping. And we filter the water before returning it back into the environment.


Incorporating new technology to improve our wastewater treatment process

We’ve been busy introducing new technology like installing a thermal hydrolysis plant (THP) at St Marys to make our current wastewater treatment process more energy efficient and cost effective.

THP will apply high pressure and temperature to break down the sludge’s organic matter into smaller and more digestible compounds. This process will produce an increased amount of biogas, a source of renewable energy. The increased volume of biogas will help reduce St Marys’ energy costs by producing more renewable electricity onsite. A real win-win!

The new plant will also significantly reduce the truck movements to dispose of large quantities of solids. This means less noise in the community and a smaller carbon footprint.

We are always looking ahead to find new ways to ensure we are delivering great infrastructure for the residents of Sydney’s North-West. Stay tuned for more updates.


Any queries

We appreciate your patience during this important work and will continue to keep you informed. If you have any questions about the Lower South Creek Treatment Program, please contact the Community Relations Team on 1800 870 767 or lowersouthcreek@sydneywater.com.au