Refresh Vaucluse and Diamond Bay

Diamond Bay at sunrise


We're refreshing the wastewater system to stop the continuous flow of untreated wastewater into the ocean.

Whilst challenging, we know this is the right thing to do and we need you to get involved as we fix this problem once and for all.

Refreshing the wastewater system in Vaucluse Diamond Bay offers multiple benefits—improving the harbour and coastal water quality, protecting the health of community and marine ecology, as well as reducing odour.



We're refreshing the wastewater system to stop the continuous flow of untreated wastewater into the ocean.

Whilst challenging, we know this is the right thing to do and we need you to get involved as we fix this problem once and for all.

Refreshing the wastewater system in Vaucluse Diamond Bay offers multiple benefits—improving the harbour and coastal water quality, protecting the health of community and marine ecology, as well as reducing odour.


  • Finalising the concept design

    about 2 months ago
    Vaucluse diamond bay concept design map

    Following topographical and geological investigations and working closely with the community, the solution design to divert the last three untreated wastewater coastal outfalls in Sydney is nearing completion.

    Given the limited open space, geology, as well as the highly sensitive heritage, coastal and harbour iconic locations, the main challenge was always to find suitable sites to locate two underground pumping stations.

    In determining those sites, we listened to our Community Reference Group (made up of local residents as well as representatives of Woollahra and Waverley Councils) to minimise possible construction and environmental impacts, while designing solutions that enhance our amenity...


    Following topographical and geological investigations and working closely with the community, the solution design to divert the last three untreated wastewater coastal outfalls in Sydney is nearing completion.

    Given the limited open space, geology, as well as the highly sensitive heritage, coastal and harbour iconic locations, the main challenge was always to find suitable sites to locate two underground pumping stations.

    In determining those sites, we listened to our Community Reference Group (made up of local residents as well as representatives of Woollahra and Waverley Councils) to minimise possible construction and environmental impacts, while designing solutions that enhance our amenity at sites where work needs to be done.

    Almost all the new infrastructure will be located below ground. Anything above ground, such as valves or electrical kiosks, will be minimal and designed to blend as much as possible with the existing environment.

    New wastewater pipes, ranging between 20cm to 37.5cm in diameter, will be laid using trenchless technology up to 80m below ground, so there will be minimal construction impacts during or after construction. There will be some short sections of open trench work on the road verges where we connect to the existing network.

    Sydney Water will continue to work with the community, as well as local councils to refine design aspects. The final solution design will be displayed in March 2020, when we seek formal submissions from the public as part of the environmental approval process. Construction is expected to occur in the second half of 2020. Click here to view or print the concept design map.
  • Vaucluse catchment design

    about 2 months ago
    Artist impressions   parsley bay before and after


    The existing wastewater pipes for Vaucluse and Watsons Bay converge and connect to the Vaucluse ocean outfall in Parsley Bay. We therefore need to work in Parsley Bay to redirect the catchment to new pipes.

    The new infrastructure required for this includes a wastewater pump station. We worked with the Community Reference Group and Woollahra Council and looked at the suitability of several possible sites for the new pumping station. Most were ruled out because of heritage sensitivities or community impacts. We agreed to locate the pumping station underground where the existing amenities building is located at the rear of...



    The existing wastewater pipes for Vaucluse and Watsons Bay converge and connect to the Vaucluse ocean outfall in Parsley Bay. We therefore need to work in Parsley Bay to redirect the catchment to new pipes.

    The new infrastructure required for this includes a wastewater pump station. We worked with the Community Reference Group and Woollahra Council and looked at the suitability of several possible sites for the new pumping station. Most were ruled out because of heritage sensitivities or community impacts. We agreed to locate the pumping station underground where the existing amenities building is located at the rear of the Parsley Bay Reserve car park. Before starting, we will build toilet block amenity closer to the recreational area to ensure there are no disruptions for community members wishing to use the facility.

    Diverting the Vaucluse catchment involves:
    • Intercepting the network connection to the existing ocean outfall pipe at Parsley Bay
    • Constructing a new pumping station in Parsley Bay (70L/s)
    • Installing 35cm wide pipe using trenchless horizontal directional drill that will connect existing main at Rose Bay
    We will continue working with Woollahra Council to develop the design of the new amenity building. View or print the artist impression here.

  • Diamond Bay catchment design

    about 2 months ago
    Artist impressions   eastern avenue reserve


    There are two existing ocean outfalls at Eastern Reserve and Diamond Bay. We plan to connect the two ocean outfalls, then pump the wastewater to the existing wastewater network at Old South Head Road.

    The existing pipe is large and has capacity to easily get the wastewater to the treatment plant at Bondi. Once at Bondi, the wastewater will be treated and discharged into the ocean through deep ocean outfall pipes.

    Diverting the Diamond Bay catchment involves:
    • Intercepting the existing outfalls at Eastern Reserve and Diamond Bay
    • Installing a 30cm wide pipe to connect Diamond Bay to Eastern...



    There are two existing ocean outfalls at Eastern Reserve and Diamond Bay. We plan to connect the two ocean outfalls, then pump the wastewater to the existing wastewater network at Old South Head Road.

    The existing pipe is large and has capacity to easily get the wastewater to the treatment plant at Bondi. Once at Bondi, the wastewater will be treated and discharged into the ocean through deep ocean outfall pipes.

    Diverting the Diamond Bay catchment involves:
    • Intercepting the existing outfalls at Eastern Reserve and Diamond Bay
    • Installing a 30cm wide pipe to connect Diamond Bay to Eastern Reserve
    • 33L/s pumping station at Eastern Reserve
    • 20cm wide rising main to connect to the existing Rose Bay sub main
    Working with Waverley Council and guided by local input, we will refine the design to blend with the environment. We will also contribute to Council’s planned improvements to the clifftop boardwalk at Diamond Bay. You can view or print artist impression of Eastern Avenue Reserve here.
  • Connection points at Rose Bay

    about 2 months ago
    Rose bay connections   carlisle street and dover road

    We need to connect the pipes in Vaucluse and Watson Bay to a new pipe, and pump the wastewater to the existing Rose Bay network.

    It will be achieved through the installation of a 37cm wide gravity main running from Carlisle Street and a 35cm wide pressure main running from Parsley Bay. These mains will connect to the existing Rose Bay submain in Dover Road.

    This will involve some short sections of open trench work on the verge of roads where we need to connect to the existing network. The work is expected about four to six weeks...


    We need to connect the pipes in Vaucluse and Watson Bay to a new pipe, and pump the wastewater to the existing Rose Bay network.

    It will be achieved through the installation of a 37cm wide gravity main running from Carlisle Street and a 35cm wide pressure main running from Parsley Bay. These mains will connect to the existing Rose Bay submain in Dover Road.

    This will involve some short sections of open trench work on the verge of roads where we need to connect to the existing network. The work is expected about four to six weeks to complete.

    The works will not affect traffic as the construction will be occurring on the road shoulder. You can view or print the map showing these connections here.



  • Community support shining like a diamond

    2 months ago
    Sw refresh diamond bay 09 low
    About 300 people came to chat and tell us what they think about this project at six information pop-up sessions held in Rose Bay, Parsley Bay and Diamond Bay during November.

    The events were promoted on Facebook, reaching over 14,000 people in the local area, resulting in over 3,300 visits to this Sydney Water Talk site.

    For those came to one of our 'pop-up' sessions visit our photo gallery and feel free to share your favourite images via your social networks.


    About 300 people came to chat and tell us what they think about this project at six information pop-up sessions held in Rose Bay, Parsley Bay and Diamond Bay during November.

    The events were promoted on Facebook, reaching over 14,000 people in the local area, resulting in over 3,300 visits to this Sydney Water Talk site.

    For those came to one of our 'pop-up' sessions visit our photo gallery and feel free to share your favourite images via your social networks.


  • Two community sessions left

    3 months ago
    Img 1507
    Our pop-up community information sessions are running all this month. Share your ideas with us to help refine the Refresh Vaucluse Diamond Bay project. We have two sessions left, so make sure to come down.

    Apart from all the latest project news, you can also pick up some free goodies such as Sydney Water shower timers. Join our team between 10am – 1pm at:

    • Sunday 24 November 2019 - Parsley Bay Reserve – BBQ with Rose Bay Rotary Club
    • Saturday 30 November 2019 - Diamond Bay Reserve – BBQ with Rose Bay Rotary Club.


    Our pop-up community information sessions are running all this month. Share your ideas with us to help refine the Refresh Vaucluse Diamond Bay project. We have two sessions left, so make sure to come down.

    Apart from all the latest project news, you can also pick up some free goodies such as Sydney Water shower timers. Join our team between 10am – 1pm at:

    • Sunday 24 November 2019 - Parsley Bay Reserve – BBQ with Rose Bay Rotary Club
    • Saturday 30 November 2019 - Diamond Bay Reserve – BBQ with Rose Bay Rotary Club.


  • November community information sessions

    4 months ago
    Tell us what you think about the Refresh Vaucluse Diamond Bay project at a pop-up community information session which are being held across the peninsula every weekend this month.

    Apart from all the latest project news, you can also pick up some free goodies such as Sydney Water shower timers. Join our team between 10am – 1pm at:

    • Saturday, 9 November 2019 - the Eastern Reserve, Dover Heights (near the Eastern Avenue entrance)
    • Sunday 10 November 2019 - Rose Bay North’s shopping precinct (near the supermarket) on Old South Head Road
    • Saturday 16 November 2019 -...

    Tell us what you think about the Refresh Vaucluse Diamond Bay project at a pop-up community information session which are being held across the peninsula every weekend this month.

    Apart from all the latest project news, you can also pick up some free goodies such as Sydney Water shower timers. Join our team between 10am – 1pm at:

    • Saturday, 9 November 2019 - the Eastern Reserve, Dover Heights (near the Eastern Avenue entrance)
    • Sunday 10 November 2019 - Rose Bay North’s shopping precinct (near the supermarket) on Old South Head Road
    • Saturday 16 November 2019 - Rose Bay East shopping precinct (near hardware store) Old South Head Road
    • Sunday 17 November 2019 - Rose Bay shopping precinct (near Rose Bay Hotel) New South Head Road
    • Sunday 24 November 2019 - Parsley Bay Reserve – BBQ with Rose Bay Rotary Club
    • Saturday 30 November 2019 - Diamond Bay Reserve – BBQ with Rose Bay Rotary Club.

    If you can’t make it to one of these sessions you can always call us on 1800 732 069 or email vauclusediamondbay@sydneywater.com.au to tell us what you think or ask us a question.


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  • Project Update - September 2019

    5 months ago
    We had a great turn out of community representatives from all over the peninsula at our second Community Reference Group (CRG) which was held this year on 21 August 2019 to discuss the next steps of the project’s journey.

    During the meeting the group discussed options to refine the concept design, as well as activities we’re planning to involve the community to refine the plan for diverting wastewater from Vaucluse and Diamond Bay to the Bondi Treatment Plant.

    Recently, we distributed a project community update newsletter to residents across the Vaucluse, Dover Heights and Rose Bay area to recap the...

    We had a great turn out of community representatives from all over the peninsula at our second Community Reference Group (CRG) which was held this year on 21 August 2019 to discuss the next steps of the project’s journey.

    During the meeting the group discussed options to refine the concept design, as well as activities we’re planning to involve the community to refine the plan for diverting wastewater from Vaucluse and Diamond Bay to the Bondi Treatment Plant.

    Recently, we distributed a project community update newsletter to residents across the Vaucluse, Dover Heights and Rose Bay area to recap the project’s benefits and seeking for your feedback. If you didn’t receive one the community update can also be found under the ‘Document Library’ on this website.

    We’re relying on your feedback to help us develop a concept design which will benefit the community, so call 1800 732 069 or email vauclusediamondbay@sydneywater.com.au if you have a question or let us know what you think by registering and posting your comments here.

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  • Project Update - August 2019

    7 months ago

    Having worked with the community to identify a preferred solution to redirect untreated wastewater away from the last three remaining ocean outfalls at Vaucluse and Diamond Bay, this year we’re asking you for help to develop the concept design.

    While we’ve already extensively modeled the wastewater system in your area to identify a solution, we still need to do more to better understand the topography, soil and site suitability.

    Changing the way wastewater flows in your area means we need to reconfigure existing and new supporting infrastructure like underground pipes and pumping stations. However, recent advances in technology...

    Having worked with the community to identify a preferred solution to redirect untreated wastewater away from the last three remaining ocean outfalls at Vaucluse and Diamond Bay, this year we’re asking you for help to develop the concept design.

    While we’ve already extensively modeled the wastewater system in your area to identify a solution, we still need to do more to better understand the topography, soil and site suitability.

    Changing the way wastewater flows in your area means we need to reconfigure existing and new supporting infrastructure like underground pipes and pumping stations. However, recent advances in technology enables us to work with you to refine the concept design to have the least impact on the environment and the community — locating supporting infrastructure underground and using pipes which will be about 30cm in diameter and up to 70m below street level.

    Working with you we expect to complete the concept design by the end of this year and following public submissions, complete environmental approvals by March 2020. Construction is then anticipated to start in the latter half of 2020.


    Next steps

    Throughout this process we will be seeking your views to help us refine the route, appearance, footprint and proposed construction approaches for the new infrastructure.

    We’ve already held our first Community Reference Group in June 2019, and in the coming weeks and months we will be letter-boxing and holding local community information sessions, as well as seeking your views through Sydney Water Talk and interactive feedback online tools.

    Please subscribe here to receive latest news and details about these information events. If you have any questions or concerns, drop us an email or give us a call. Your feedback is always important to us.

    Call 1800 732 069 or email vauclusediamondbay@sydneywater.com.au


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  • NSW Government's commitment to end ocean outfalls

    over 1 year ago

    Today the NSW Government announced it will stop the continuous flow of untreated wastewater from three ocean outfalls at Vaucluse and Diamond Bay.  

    The Refresh Vaucluse Diamond Bay project will now commence detailed work to redirect untreated wastewater away from these outfalls and transfer it to the Bondi Wastewater Treatment Plant.

    Refreshing the wastewater system in your area will address the pollution, water quality and public health risks associated with the ocean outfalls and bring your wastewater system up to the same standard as the rest of Sydney.

    Sydney Water is very pleased...

    Today the NSW Government announced it will stop the continuous flow of untreated wastewater from three ocean outfalls at Vaucluse and Diamond Bay.  

    The Refresh Vaucluse Diamond Bay project will now commence detailed work to redirect untreated wastewater away from these outfalls and transfer it to the Bondi Wastewater Treatment Plant.

    Refreshing the wastewater system in your area will address the pollution, water quality and public health risks associated with the ocean outfalls and bring your wastewater system up to the same standard as the rest of Sydney.

    Sydney Water is very pleased with the support we’ve received from the community to date and we’ll be looking for your continued involvement as we work to fix this long-standing problem.

    Our solution

    This year we’ve investigated various ways we can treat the wastewater we collect from Watsons Bay, Vaucluse, Diamond Bay, Rose Bay North and parts of Dover Heights.

    After a public expression of interest process, we set up a Community Reference Group and over four meetings, we’ve tested our ideas. They’ve given us important input on what the community values and loves about the area.

    With this information, we’ve chosen to connect the ocean outfalls to a large wastewater pipe that runs along Old South Head Road. This pipe has capacity and it’s the easiest way to get the wastewater that currently flows directly into the ocean to a treatment plant.

    What’s next

    Next year will be an important one for this project.

    There’s a lot involved in planning an infrastructure project of this scale and local knowledge can help identify local solutions to local challenges. That’s why we’ll continue to involve the community as we come up with a design, seek environmental approvals and secure funding.

    Once these approvals are secured, Sydney Water can commence construction in 2020 and this legacy issue with become history.

    Let’s keep talking

    Whilst we still don’t have all the answers, it’s important we keep talking.  

    Your feedback is important to us.

    Call 1800 645 466 or email vauclusedaimondbay@sydneywater.com.au