About the Project

The Annacis Island Wastewater Treatment Plant is one of our region’s largest wastewater treatment facilities. It receives and treats wastewater from 14 municipalities across the Lower Mainland so that it can be safely released back into the Fraser River.

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 and the environment. Planned improvements include:

  • Building a new outfall pipe to carry treated wastewater from the plant to the Fraser River
  • Increasing the size of the plant and its ability to treat more wastewater
  • Repairing or replacing older parts of the existing plant
  • Strengthening the plant to reduce the impacts of an earthquake
  • Improving existing odour controls
  • Building a more reliable back‑up power source

The Annacis Island Wastewater Treatment Plant improvements will happen in multiple phases and continue over the next several years.


The Annacis Island Wastewater Treatment Plant is located in Delta on Annacis Island

Plant Improvements

The Annacis Island Wastewater Treatment Plant currently treats wastewater using primary and secondary treatment technologies. An expanded facility will ensure that the plant can manage a higher volume of wastewater, continue to keep odour to a minimum and will continue to operate in the event of a major earthquake.

There are over 20 projects planned as part of the on-site improvements of the Annacis Island Wastewater Treatment Plant. Improvement projects include:

  • New trickling filters
  • Secondary clarifiers
  • A co-generation facility to make better use of green energy captured on site

Overview of the Annacis Island Wastewater Treatment Plant highlighted improvements

COVID-19 and Delivery of Essential Services

Metro Vancouver continues to closely monitor developments regarding COVID-19 and our paramount commitment is to maintain essential services to the region while protecting the health and safety of our employees and partners. Metro Vancouver’s construction projects are key components in ensuring the ongoing delivery of essential services as defined by the Province of BC. Metro Vancouver follows the guidance of the Provincial Health Officer and is taking all necessary measures to ensure our worksites remain safe and healthy.

Contact Us

  • Community Liaison


    Monday to Friday from 8:00 a.m. to 4:30 p.m.