What situation may lead to backflow contamination in drinking water?

Backflow contamination in drinking water occurs when a reversal of flow allows contaminants to enter a potable water system. A cross connection is a specific type of link between a drinking water supply and a source of contamination, such as a sewage line or chemical feed line. When there is a drop in water pressure, due to heavy demand or a broken main, water can flow back through this cross connection into the clean supply, bringing with it harmful substances or pathogens.

This highlights the importance of maintaining proper plumbing and preventing cross connections in any system that supplies drinking water. Understanding this concept helps food handlers and other professionals ensure the safety and integrity of water used in food preparation and other activities.