What is cross-connection in plumbing?

Cross-connection in plumbing refers specifically to an actual or potential connection between a drinkable water supply and a non-potable source. This situation poses a risk because it allows contaminated water from the non-potable source to flow back into the potable water supply, potentially leading to serious health hazards. For instance, if there is a direct link between the water system and a source of toxic chemicals or waste, any backflow could introduce harmful substances into drinking water.

Recognizing the significance of cross-connections is crucial for ensuring public health and safety. Proper plumbing practices, including backflow prevention devices and regular inspections, are necessary to mitigate these risks and prevent contamination of clean water supplies. Understanding this concept is essential for anyone involved in residential plumbing inspections, as preventing cross-connections is a key aspect of maintaining safe drinking water systems.