What does the term "cross-connection" describe in plumbing?

The term "cross-connection" refers specifically to a physical connection between a safe water supply and a potentially contaminated source. This understanding is critical in plumbing and public health because such connections can lead to the backflow of contaminants into the potable water system, posing serious health risks. Cross-connections frequently occur in settings where non-potable water, such as irrigation systems, or water used for industrial purposes, can inadvertently mix with drinking water.

Maintaining the integrity of the water supply and preventing contamination is essential for safe drinking water, which is why regulations such as backflow prevention are emphasized in plumbing codes. Recognizing and addressing cross-connections is fundamental for plumbers to ensure compliance with safety standards and protect public health.