What does the term "cross-connection" refer to in a water distribution system?

The term "cross-connection" specifically refers to a physical connection between potable (drinking) water and non-potable water sources, which creates the potential for contamination of the drinking water supply. This situation can arise when there is a backflow, allowing harmful substances from the non-potable side to flow into the potable system, posing serious health risks.

Preventing cross-connections is a critical focus in water system management and plumbing regulations to ensure that the drinking water remains safe and uncontaminated. Properly designed systems often include backflow prevention devices to mitigate this risk. Understanding this concept is vital for maintaining public health and water safety.