Backflow prevention is a vital measure to protect Toronto’s water supply from contamination, ensuring public health and safety. Backflow occurs when water flows in the opposite direction of its intended path, often due to pressure changes, potentially allowing pollutants and harmful substances into the drinking water system. As per Ontario regulations, every property with a potential cross-connection must install certified backflow prevention devices to comply with municipal and provincial standards.

Toronto’s intricate water system is vulnerable to backflow incidents if proper preventative measures aren’t in place. Common causes include sudden drops in pressure within the public water supply or back-siphonage events, such as fire hydrant use or water main breaks. These situations can lead to pollutants like chemicals, bacteria, and industrial waste entering the potable water system, posing significant health risks.