The CMHC has listings for several Canadian examples of onsite water reuse. The most prominent of the examples is Toronto’s Healthy House. The construction of the house makes it 100% self-sustaining. It does not use any of the municipal services that every other house in Ontario regularly takes for granted. This includes heating and water and wastewater systems. The house is 1700 square foot, semi-detached, and contains three bedrooms and four floors. It is located in the Riverdale area of Metropolitan Toronto. For more information, please see the website at http://www.cmhc-schl.gc.ca/popup/hhtoronto/frame.html. Another healthy house exists on a First Nations reserve near Dryden, Ontario. More information on this house can be found here.
Fore more case studies, please see the uses section, where they are sorted by usage category.
Other Canadian case studies are also summarized in more detail on the CMHC website. They include:
Quayside Village in West Vancouver, BC
A 20-unit apartment building will use it’s greywater for toilet flushing. The project is being used to showcase the advances in water reuse technology. Based on technology created in the Toronto Healthy House, the apartment building takes used water from everywhere except toilets, treats the water, and distributes it to all toilets in the building. The village is also equipped with distribution system for showers, which has yet to be used. The water demand and wastewater disposal have both decreased by approximately 40%.
Five single family homes in the Northwest Territories have installed water reuse systems. All grey and black water is reused for non-potable uses. Because of the size of the Northwest Territories, water and wastewater is distributed by trucks instead of massive piping systems. Obviously, transporting water by truck is not very cost efficient, and there is therefore a large savings in reusing water, and thus limiting the need for pick-up and delivery of water. Approximately $5000 per house per year will be saved in trucking costs.
Cape Dorset, Nunavut
Similar to Yellowknife, the sparse population of Nunavut makes the creation of water distribution and retrieval systems inefficient, and truck haulage of water is used. Seventeen units in Cape Dorset have been equipped with water reuse systems. Toilet flushing and laundry applications are now using reclaimed wastewater. While capital costs are fairly high, the systems are expected to save $12 000 each in truck haulage costs.
Sooke, British Columbia
There are two buildings in Sooke, British Columbia that are featured on the CMHC website as reusing their water. The first is an expanding bed and breakfast that needed to accomodate for increasing wastewater flows. The system reuses water for toilet flushing, reducing water demand by 2300 m3/year and allowing the capacity of the bed and breakfast to more than double.
The second system also reuses water for toilet flushing. A small government building in Sooke saves approximately 600 m3/year. The system is expected to pay for itself quickly.
Reyston, British Columbia
The Kingfisher Oceanside Inn, looking to expand its operations, were only allowed to have a wastewater discharge of 45000 L/day because of the environmental sensitivity of the area. Water is reused for toilet and urinal flushing, as well as garden irrigation.
The Gold Bar Wastewater Treatment Plant began reusing their water for on-site practices such as tank washing, equipment washdown and dilution water for polymer addition for the dissolved air sludge thickening process. Neighbouring industries have recently been interested in using this water for their processes, and studies have been undertaken to determine if this process is possible.