The Canadian city of Guelph has long been considered a leader in water sustainability and conservation in Canada. With climate change, a constrained supply of groundwater as their primary drinking water source, and increasing provincial population growth, it became necessary for the city to further increase water efficiency. The city responded by introducing rebates for installation of greywater reuse and rainwater harvesting systems, which reduce demand on the water supply by allowing homes and businesses to use water that would otherwise enter sewage or stormwater systems.

Photo by Randy Bartholomew on Flickr