Share this page Print

Bonnybrook Wastewater Treatment Plant Upgrades and Expansion

The Bonnybrook Wastewater Treatment Plant is the largest of Calgary's three wastewater treatment plants, with a capacity to treat the wastewater from approximately one million people. Calgary and surrounding regions (such as Cochrane, Airdrie and Elbow Valley) that are served by the Bonnybrook Wastewater Treatment Plant have experienced significant population growth in recent years, which has generated an increase in the amount of wastewater requiring treatment. Learn more about the wastewater treatment process.

Improvements to the existing Bonnybrook Wastewater Treatment Plant are required to increase the available treatment capacity while maintaining the current level of wastewater treatment. Some enhancements to the treatment process are also being completed to improve long-term environmental performance to continue to protect the Bow River for generations. The City is investing in a number of infrastructure improvements at the Bonnybrook Wastewater Treatment Plant through 2022.

Upgrades to the plant will include lifecycle replacements of some existing equipment, upgrades to improve energy efficiency and environmental performance, expansion of treatment capacity through the addition of new infrastructure, as well as a flood resiliency component to prevent river backup into the plant during high water events. The upgrades and expansion of the Bonnybrook Wastewater Treatment Plant will ensure advanced wastewater treatment for a growing population while minimizing impacts to the Bow River.

Project activity:

Photo Gallery - Unclassified

  • Aerial view of the proposed expansion and upgrade to the Bonnybrook Wastewater Treatment Plant
  • A S.W. panorama view of the proposed expansion and upgrade to the Bonnybrook Wastewater Treatment Plant
  • The proposed filtration treatment facility will improve the filtered effluent quality
  • The thermal hydrolysis process building will heat and pressurize solids to reduce the amount of solids generated by the plant. This plant is the first of its kind in Canada, and the second in North America

Project updates:

April 18 - December 31, 2016 (temporary closure of a portion of 15 Street S.E.)

  • The construction of the dewatering building at the Bonnybrook Wastewater Treatment Plant requires the temporary closure of a portion of 15 Street S.E. to excavate along 15 Street and connect the new dewatering building to the existing wastewater treatment facilities across the street.
  • The closure will be in place between April 18 to December 31, 2016.

Project timeline:

Construction will take place from 2015 to 2022. Design completion expected in mid-2017.

Staggered design and construction starts:

  • Digester upgrades to begin in summer 2016.
  • Underground utility work to begin fall 2016.

For general inquiries please call 311. For media inquiries please call 403-828-2954 or email