Bonnybrook Wastewater Treatment Plant D Expansion

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Image Credit: City of Calgary

Ranking for 2017: 77

Industry Sector: Other

Specific Sector: Water-Wastewater

Range: $500,000,000 - $1 billion

Project Value: $600,000,000

Government Funds Involved:

Funding Source: Public

Location: Calgary, Alberta

Estimated End Date of Substantial Completion: 2022


One of Calgary’s three wastewater treatment plants, Bonnybrook, is undergoing an expansion with the plant estimated to be able to service an additional equivalent population of 327,000 people. When Phase 3 of construction is completed in 2022, the facility will service a population of of 1.275 million people.

Plant D will be composed of separate facilities running the three wastewater treatment processes. The expansion includes adding primary and secondary

clarifiers, a biological nutrient removal system, and filtration. The city is also upgrading the ultraviolet disinfection system as well as the primary and secondary sludge thickening systems. In addition to the new plant, the city is making upgrades to the current facility, including adding a flood resiliency component to protect critical infrastructure from river flooding, overland flooding, and flooding from too much sewage.

Preliminary design for Phase 3 is wrapping up and pre-construction work should start in 2016, with actual construction commencing in 2017. Phase 1 and 2 will be completed in 2020, with Phase 3’s completion scheduled for 2022.


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