What is a cross-connection in water systems?

A cross-connection in water systems refers to a point where drinking water can potentially mix with wastewater or any non-potable water supply. This situation poses a significant health risk, as it can lead to the contamination of the drinking water supply. For example, if there is a direct physical connection between a clean water line and a source of contamination—such as a hose connected to a sewage drain—the potential exists for contaminated water to flow back into the potable supply, particularly during events such as a drop in water pressure.

Recognizing and preventing cross-connections is an essential aspect of water system management and public health protection. The implementation of devices such as backflow preventers is crucial in safeguarding drinking water from contamination, ensuring that the two systems remain separate and that drinking water is safe for consumption. This understanding of cross-connections is important for water system operators and anyone involved in public health or environmental safety.