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Wastewater Treatment Plants and Processes

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​​Liquid Waste Management Plan Update

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​​Metro Vancouver treats about 440 billion litres of wastewater (or sewage) every year. Wastewater can contain a number of different pollutants and waste products, including soap, food scraps, human waste, oils and other chemicals.

Wastewater treatment processes​​

Metro Vancouver operates five wastewater treatment plants that process over 1 billion litres of wastewater (or sewage) every day, protecting public health and the environment.


  • Fraser Sewerage Area (Serviced by Annacis Island)
  • Fraser Sewerage Area (Serviced by Northwest Langley)
  • Lulu Sewerage Area
  • North Shore Sewerage Area
  • Vancouver Sewerage Area
​​​Wastewater is treated using either primary or secondary treatment processes:
  • Primary treatment (Iona Island and Lions Gate Wastewater Treatment Plants) – removes materials that float or readily settle out by g​ravity, and up to 50% of dissolved organic materials
  • Secondary treatment (Lulu Island, Annacis Island, and Northwest Langley Wastewater Treatment Plants) – uses biological processes to remove 90% or more of materials, including small suspended solids and soluble organic materials

During treatment, wastewater is tested to ensure that treatment plant processes are working effectively and meeting regulations. Treated wastewater (effluent) is rel​eased into the Fraser River, Burrard Inlet or Strait of Georgia. As part of the treatment process Metro Vancouver recovers resources from wastewater, including heat, electricity and biosolids.

Wastewater treatment plant upgrades

Various projects and initiatives are in progress to meet the wastewater treatment needs of our growing region. In addition to building a new North Shore Treatment Plant, some existing plants are being upgraded to improve treatment processes, adapt to climate change, mitigate earthquake impacts, and other needs. Some wastewater treatment plants – like the new North Shore Treatment Plant – will use tertiary treatment processes in the future. Tertiary treatment removes ammonia, nutrients and almost all organic matter.

Learn more about the wastewater projects and initiatives

 

 

Metro Vancouver Wastewater System Overviewhttps://metrovancouver.org/services/liquid-waste/Documents/k-12-resources-wastewater-system-overview.pdf, Metro Vancouver Wastewater System OverviewMetro Vancouver Wastewater System Overview
What happens when I flush?https://metrovancouver.org/services/liquid-waste/Documents/when-flush-brochure.pdf, What happens when I flush?What happens when I flush?

Why we treat wastewater

Organic materials in wastewater use oxygen to break down, using up oxygen in the water that fish and other aquatic life need. Biochemical oxygen demand (BOD) is a measure of the oxygen consumed by wastewater. Suspended solids (TSS) in water block light and interfere with the growth of aquatic life. Suspended solids and biochemical oxygen demand are removed during the treatment process.

Treating wastewater removes substances that can harm human health and the environment. Wastewater contains pollutants and waste products, like soap, food scraps, human waste, oils and chemicals. If we don’t remove pollutants from wastewater, they go directly into our rivers and oceans. This can threaten marine life, public health and our ability to swim, boat and fish in our local waters.

Effluent monitoring - operational certificates

Each treatment plant is issued an Operational Certificate by the BC Ministry of Environment. The Operational Certificate requires effluent released from the treatment plant to meet certain treatment standards.

Monthly reporting of effluent quality data is provided for each wastewater treatment plant:

 

 

Annacis Island WWTP OC Report - May 2024https://metrovancouver.org/services/liquid-waste/Documents/ai-wwtp-oc-report-2024-05.pdf, Annacis Island WWTP OC Report - May 2024Annacis Island WWTP OC Report - May 2024
Iona Island WWTP OC Report - May 2024https://metrovancouver.org/services/liquid-waste/Documents/ii-wwtp-oc-report-2024-05.pdf, Iona Island WWTP OC Report - May 2024Iona Island WWTP OC Report - May 2024
Lions Gate WWTP OC Report - May 2024https://metrovancouver.org/services/liquid-waste/Documents/lg-wwtp-oc-report-2024-05.pdf, Lions Gate WWTP OC Report - May 2024Lions Gate WWTP OC Report - May 2024
Lulu Island WWTP OC Report - May 2024https://metrovancouver.org/services/liquid-waste/Documents/li-wwtp-oc-report-2024-05.pdf, Lulu Island WWTP OC Report - May 2024Lulu Island WWTP OC Report - May 2024
North West Langley WWTP OC Report - May 2024https://metrovancouver.org/services/liquid-waste/Documents/nwl-wwtp-oc-report-2024-05.pdf, North West Langley WWTP OC Report - May 2024North West Langley WWTP OC Report - May 2024

Trucked liquid waste

A small amount of liquid waste is brought to wastewater treatment plants by truck, instead of through the regional sewer system. A summary of trucked liquid waste disposed of at the Iona Island, Annacis Island and Northwest Langley wastewater treatment plants is also provided monthly. ​​

 

 

Annacis Island WWTP TLW Disposal OC Data Report – May 2024https://metrovancouver.org/services/liquid-waste/Documents/ani-tlw-2024-05.pdf, Annacis Island WWTP TLW Disposal OC Data Report – May 2024Annacis Island WWTP TLW Disposal OC Data Report – May 2024
Iona Island WWTP TLW Disposal OC Data Report – May 2024https://metrovancouver.org/services/liquid-waste/Documents/ion-tlw-2024-05.pdf, Iona Island WWTP TLW Disposal OC Data Report – May 2024Iona Island WWTP TLW Disposal OC Data Report – May 2024
North West Langley WWTP TLW Disposal OC Data Report – May 2024https://metrovancouver.org/services/liquid-waste/Documents/nwl-tlw-2024-05.pdf, North West Langley WWTP TLW Disposal OC Data Report – May 2024North West Langley WWTP TLW Disposal OC Data Report – May 2024

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 Related links

 

 

Projects and Initiativeshttps://metrovancouver.org/services/liquid-waste/projects-and-initiatives, Projects and InitiativesProjects and Initiatives
Metro Vancouver’s Wastewater Systemhttps://metrovancouver.org/services/liquid-waste/metro-vancouvers-wastewater-system, Metro Vancouver’s Wastewater SystemMetro Vancouver’s Wastewater System
Wastewater Testing and Environmental Monitoringhttps://metrovancouver.org/services/liquid-waste/wastewater-testing-and-environmental-monitoring, Wastewater Testing and Environmental MonitoringWastewater Testing and Environmental Monitoring
Using Wastewater as a Resourcehttps://metrovancouver.org/services/liquid-waste/using-wastewater-as-a-resource, Using Wastewater as a ResourceUsing Wastewater as a Resource

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