Improving our wastewater system

Projects to make it work better

Projects to maintain and upgrade our wastewater system are an important part of what we do to help protect public health and the environment across Sydney, the Blue Mountains and the Illawarra. Whether it's our pipes, wastewater overflows, pumping stations or treatment and recycling plants, we're committed to making the system better.


We improve the reliability of our wastewater system by repairing or replacing old wastewater pipes. We also install new pipes to increase the system’s capacity. 

Network Repairs Program

We repair or replace small sections of cracked, collapsed or damaged wastewater pipes across our system throughout Sydney. Thousands of jobs are completed each year as part of our Network Repairs Program.

Refresh Vaucluse and Diamond Bay 

We’re investigating options to deliver a permanent long-term solution to manage the last remaining untreated wastewater ocean outfalls in NSW. See what we're doing at  Vaucluse and Diamond Bay in Sydney.

We continually check our wastewater assets to keep them in good condition.

Sewer and stormwater rehabilitation

We're upgrading lengths of our wastewater and stormwater pipes throughout Sydney. This work helps prevent leaks in pipes for the next 50 years.

This work includes

  • relining small wastewater pipes (up to 300 mm in diameter)
  • relining large wastewater pipes (up to 900 mm in diameter)  
  • rehabilitating junctions in the wastewater pipe network
  • inspecting and repairing maintenance holes
  • cleaning wastewater and stormwater pipes
  • using closed circuit television (CCTV) to inspect wastewater and stormwater pipes before and after the work.

Specialist crews usually need to make several visits to affected properties. Each project takes about 4 weeks to complete.

This work is part of our SewerFix Program to:

  • improve the wastewater and stormwater systems
  • reduce wastewater overflows
  • protect public health and the environment.

Wastewater overflows

When the wastewater system is blocked or reaches capacity in heavy wet weather, wastewater can overflow to the local environment or within private properties. Our work includes removing blockages from pipes and building infrastructure or installing new pipes to store excess wastewater flows when needed. This helps to:

  • stop uncontrolled wastewater overflows
  • protect public health
  • protect the environment.

Our Internal Surcharge Improvement Program is helping us fix wastewater (sewage) surcharges at private properties.

It's underway in all areas of Greater Sydney. 

Key locations include Banksia, Baulkham Hills, Beverly Hills, Castle Hill, Concord, Drummoyne, Ermington, Fairfield East, Freshwater, Kogarah, Mosman, Putney, Quakers Hill, Seven Hills, West Pennant Hills, West Ryde, Wollongong and Woronora.

We install liners in wastewater pipes to help prevent overflows.

This work is part of our SewerFix Program (85KB) to improve the wastewater system and protect public health and the environment. 

To find out more, call us on 8849 6444 or write to Sydney Water, Community Relations – SewerFix, PO Box 399, Parramatta NSW 2124. 

Pumping stations

Wastewater pumping stations move wastewater flows uphill, where gravity is not effective in transporting wastewater through the system.

We build, modify or repair our wastewater pumping stations to help the wastewater system operate efficiently.

Wastewater treatment and water recycling plants

Wastewater from homes, businesses and industry is treated to a high level at our wastewater treatment and water recycling plants.

Our wastewater treatment plant improvement program helps increase our plants' performance and reliability. This includes minimising odours and expanding the capacity of our treatment plants to service the growing population. 

We're upgrading our Picton Water Recycling Plant to service new connections and growth in the area.

We're also improving the odour management system at our North Head Wastewater Treatment Plant.

We're working at Malabar Wastewater Treatment Plant to:

  • improve the reliability of the processes that treat wastewater (sewage)
  • reduce operating costs
  • improve the quality of the biosolids we produce
  • improve safety and working conditions
  • ensure we continue to comply with our environment protection licence requirements into the future.

Aerial view of the Malabar wastewater treatment plant and its surrounds.

Our work to improve existing infrastructure above and below ground at the plant includes replacing or upgrading the:

  • screenings collection, transfer and handling processes
  • grit capture, dewatering and out loading processes
  • raw wastewater pumps
  • sludge and scum collection systems
  • sludge digestion and biosolids handling and transfer systems
  • overall control system and other electrical equipment
  • water delivery infrastructure, compressed air, recycled water and underground ventilation systems.

We'll also remove equipment that's no longer required and landscape the site.

This work is being delivered by 4Malabar, an alliance between Sydney Water, John Holland, UGL Engineering and GHD.

Learn more about the plant from Our community update (570KB), or email

Have your say about our projects
Visit Sydney Water Talk to learn more about our projects and provide feedback.