Skip Ribbon Commands
Skip to main content
Sign In
Careers Contact Live Chat

Annacis Island Wastewater Treatment Plant




Annacis Island Wastewater Treatment PlantAnnacis Island Wastewater Treatment Plant<div class="ExternalClassAD0470652FDA45E880EC9A49F99B9E28"><p>The Annacis Island Wastewater Treatment Plant is our region’s largest wastewater treatment facility. It receives and treats wastewater from 14 Metro Vancouver municipalities and releases it safely into the Fraser River.</p><p>Metro Vancouver is increasing the capacity of the current facility to meet the needs of our growing population and ensure it continues to protect public health and the environment.</p><p>Planned improvements include:</p><ul><li>Increasing the size of the plant and its ability to treat more wastewater</li><li>Building a new outfall pipe to carry treated wastewater from the plant to the Fraser River</li><li>Repairing or replacing older parts of the existing plant</li><li>Making seismic improvements to reduce the impacts of an earthquake</li><li>Improving existing odour controls</li><li>Building a more reliable backup power source</li></ul><p>The Annacis Island Wastewater Treatment Plant improvements are happening in multiple phases over several years. A number of upgrades to the treatment plant are complete and in service. The remaining upgrades (listed above) are expected to be complete by the end of 2029. ​ </p> ​<br></div>City of Delta on Annacis Island



The Annacis Island Wastewater Treatment Plant, located in the City of Delta on Annacis Island Annacis Island Wastewater Treatment Plant, located in the City of Delta on Annacis Island
Annacis Island Wastewater Treatment Plant - New Outfall Pipe Island Wastewater Treatment Plant - New Outfall Pipe



Project updateProject update<div class="ExternalClassEC5AFD27E26B43C894FE4337F884480E"><p>To complete work efficiently and maintain our construction schedule, some construction activities will continue 24 hours a day, seven days a week, as needed, until the end of 2023. These activities will not have a significant impact on the surrounding communities and will generally be completed underwater, creating a natural sound barrier. Overnight activities include dredging, underwater material placement, crane and tugboat operation, and placement of precast concrete protectors.</p><p>Read the full update in the <a href="/services/liquid-waste/ConstructionDocuments/aiwwtp-new_outfall-newsletter-jul-2023.pdf" target="_blank">Annacis Outfall newsletter.</a></p></div>8/8/2023 7:00:00 AM

Plant improvements

To accommodate population growth, the Annacis Island Wastewater Treatment Plant is undergoing a major expansion to increase treatment capacity to serve 1.5 million people.

There are approximately 20 projects as part of the on-site improvements in various stages of design and construction. This phased expansion includes seismic upgrades, new odour control facilities, a three-story control systems and laboratory building, and a co-generation facility to make better use of green energy captured on site.

The development of a new digester and regional biosolids dryer is underway to enhance solids treatment and help turn the byproducts of wastewater treatment into a renewable alternative fuel for the region’s industries. Both are anticipated to be complete by 2033. The new outfall pipe construction continues and is expected to be in service by 2025.


Treated wastewater from the Annacis Island Wastewater Treatment Plant is released into the Fraser River through an existing outfall pipe. A new outfall pipe and diffuser system is being installed, which will involve constructing an approximately 1-kilometre-long tunnel from the plant to the river.

The new outfall location and design will ensure that treated wastewater disperses over a broad area underwater to maximize dilution and minimize environmental impact. The new pipe is expected to meet regional growth needs for the next 100 years while ensuring greater seismic resilience and continuous, reliable, and safe management of the region’s wastewater. Construction began in 2019 and will be completed in 2025.​​​​



OutfallOutfall<div class="ExternalClassC303FE8D0A824A03AF963A14072A63A6"><p>The new outfall pipe will be excavated using a tunnel-boring machine. This machine will be launched from the entry shaft near the Annacis Island wastewater treatment plant and progress south to the river riser in the Fraser River.</p> <img src="/services/liquid-waste/ConstructionImages/Diffuser.jpg" alt="Diffuser" /> <p>The diffuser system will be made up of one long pipe just under the surface of the river bed that will run parallel to the shore. The diffuser system will release treated water through multiple valves attached to the pipe.</p> <img src="/services/liquid-waste/ConstructionImages/DiffuserPipe1.jpg" alt="Diffuser pipe" /> <p>The image below shows the diffuser system that will be built in the river bed, parallel to the shore to avoid the river navigation channel.</p> <img src="/services/liquid-waste/ConstructionImages/DuckbillDiffuserSystem.jpg" alt="Duckbill Diffuser System" /></div>
Impacts and mitigationImpacts and mitigation<div class="ExternalClassA2A2E07234B847569BD9CC758176B976"><p>Most of the construction will occur within the plant's existing boundaries. </p><p>Activities associated with these improvements include:</p><ul><li>Building demolition</li><li>Delivering, excavating and removing soils and other materials</li><li>Additional truck traffic</li><li>Temporary vibrations near the work area </li><li>Noise</li></ul><p>All work will comply with the City of Delta’s noise bylaws or granted variances. Where practical, crews will attempt to reduce noise impacts. Generators may be required to run overnight. Diesel impact pile driving, if required, will be done only during the City of Delta’s regular construction hours.</p> ​<br></div>
Work hoursWork hours<div class="ExternalClassFAE12614FA224754A1F93FB18EC0523E"><p>Most of the work will occur during the City of Delta’s regular construction hours: </p><ul><li>Monday to Friday: between 7:00 am and 7:00 pm </li><li>Saturdays: between 9:00 am to 5:00 pm </li></ul><p>Certain construction activities that will not have a significant impact on the surrounding communities will take place 24 hours a day, 7 days a week. Please note that river conditions and flow rates may impact the work schedule. All work will comply with the City of Delta and Vancouver Fraser Port Authority’s granted bylaw variance.​ </p>​​<br></div>
EngagementEngagement<div class="ExternalClassFC5A854F8F024CC985452CDD698014DD"><p>Metro Vancouver is committed to minimizing the impacts of this project on the Annacis Island business community, river users, and First Nations.</p><p>As part of our commitment, Metro Vancouver will:</p><ul><li>Follow permitting and approvals process at the federal and provincial levels</li><li>Work with businesses, First Nations, and government agencies to identify potential project impacts and determine possible solutions</li><li>Develop and implement traffic management plans to ensure traffic flow and property access are not significantly interrupted</li><li>Ensure a number of mitigation measures are in place including environmental monitoring during construction</li><li>Develop and implement a river work plan to ensure construction does not significantly interfere with marine traffic and activities</li><li>Provide regular project updates via newsletters, web updates, and traffic advisories​<br></li></ul><p>To review the permit application with the Vancouver Fraser Port Authority, <a href="" target="_blank">click here</a>.</p></div>
Project materialsProject materials<div class="ExternalClass86A46D2907A64CBA85FAA8460F4B4F41"><ul class="fa-ul"><li>​<span class="fa-li"><i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/Documents/aiwwtp-new-outfall-fact-sheet.pdf" target="_blank">Fact Sheet - Annacis Island Wastewater Treatment Plant</a><br></li><li> <span class="fa-li"><i class="fa-light fa-file"></i></span><a href="/services/liquid-waste/Documents/ai-wwtp-upgrades-project-at-a-glance.pdf" target="_blank">Project at ​a Glance</a><br></li></ul><h3>Newsletters</h3><ul class="fa-ul"><li> <span class="fa-li"> <i class="fa-light fa-file"></i></span> ​<a href="/services/liquid-waste/ConstructionDocuments/aiwwtp-new_outfall-newsletter-jul-2023.pdf" target="_blank">​2023 - July 19 - Project Update​​​​</a> </li></ul><h3>Other engagement​​​​ materials<br></h3><ul class="fa-ul"><li> <span class="fa-li"><i class="fa-light fa-file"></i></span><a href="/services/liquid-waste/Documents/ai-wwtp-outfall-project-contractor-info-session-presentation.pdf" target="_blank">Engagement Phase 1 - 2017 - Contractor Information session presentatio</a>n<br></li><li> <span class="fa-li"><i class="fa-light fa-file"></i></span><a href="/services/liquid-waste/Documents/ai-wwtp-river-users-stakeholder-meeting-display-panels-2017-05-05.pdf" target="_blank">Engagement Phase 1 - 2017 - Marine users Information session panels</a><br></li><li> <span class="fa-li"><i class="fa-light fa-file"></i></span><a href="/services/liquid-waste/Documents/ai-wwtp-community-forum-panels-2018-11-17.pdf" target="_blank">Engagement Phase 2 - 2018 - Community forum panels</a></li><li> <span class="fa-li"><i class="fa-light fa-file"></i></span> ​ <a href="/services/liquid-waste/Documents/ai-wwtp-update-presentation-2020-02-06.pdf" target="_blank">Engagement Phase 3 - 2020 - Marine users information session presentation​</a><br></li></ul></div>



Annacis Wastewater Treatment Plant with outfall Wastewater Treatment Plant with outfall
Location of plant upgrades and outfall of plant upgrades and outfall
Outfall tunnell route tunnell route



Outfall Diffuser Arm at Annacis Island Wastewater Treatment PlantOutfall Diffuser Arm at Annacis Island Wastewater Treatment Plant780911724
Annacis Island WWTP Outfall TBMAnnacis Island WWTP Outfall TBM744770886



Completion in 2025Completion in 2025<div class="ExternalClassCAFB961C3BBC47008E3FE7DE05ED09A5"><p>Outfall​ </p></div>1
Completion in 2029Completion in 2029<div class="ExternalClass43372E5A21D349F88DA4D0A65BBAC72F"><p>Overall plant improvements ​<br></p></div>0
Completion in 2033Completion in 2033<div class="ExternalClass320C796F77AD490A85BCCB8884F9A83C"><p>Regional biosolids dryer ​<br></p></div>0
Completion in 2033 Completion in 2033 <div class="ExternalClass1A54E7881D1D48F682DF0AA0F6527B43"><p>New digester ​<br></p></div>0


Information​ Centre
Monday – Friday
8:00 am – 4:30 pm

  • Email
  • 604-432-6200​​​

After hours emergencies

  • 604-451-6610​​​

Stay connected

Subscribe to our mailing list to receive updates about our liquid waste projects.

Sign up​​​​​​

By continuing to use our website, you acknowledge the use of cookies. Privacy Statement | Accept all cookies | Change settings