What is a direct cross-connection?

A direct cross-connection refers to a specific type of connection that occurs between a potable (safe drinking) water supply and a non-potable (potentially unsafe) system. This definition highlights the critical nature of such a setup, as it poses significant health risks due to the potential for contaminants from the non-potable system entering the drinking water supply.

Understanding this term is vital in backflow prevention, as these connections can increase the likelihood of backflow incidents, where water flows in the opposite direction, potentially leading to contamination of the potable water system. The distinction between direct cross-connections and other types of connections lies primarily in the permanent nature of the relationship between the two systems and the associated hazards.

The other choices do not fully encapsulate the concept of a direct cross-connection. For instance, while a permanent link between potable and non-potable systems could imply a direct cross-connection, it does not clarify the specifics about the nature of the link. The mention of backpressure in another option addresses a particular condition affecting backflow but does not directly define what a cross-connection is. Lastly, referring to a temporary connection with no hazards misaligns with the definition because any connection between these two systems invites the risk of contamination and is