How can cross-connections pose a risk to public health?

Cross-connections are direct connections between a potable water supply and a non-potable source. They pose a significant risk to public health primarily because they can allow contaminants to enter the drinking water supply. If there is a drop in pressure in the potable water system—due, for example, to a nearby water main break or high water demand—the contaminated water from a non-potable source can be siphoned into the clean water system, leading to serious health risks for consumers. This can introduce pathogens, chemicals, and other harmful substances into the water that people consume, potentially leading to waterborne illnesses and other health issues.

The importance of preventing cross-connections is underscored by regulatory measures and best practices in water system management. Addressing these risks is crucial for maintaining safe public water supplies.