Define the term 'cross-connection' in plumbing.

The term 'cross-connection' refers specifically to an actual or potential connection between a potable water supply and a non-potable source. This definition is crucial in plumbing because cross-connections pose significant health risks. They create pathways for contaminants from non-potable sources, like wastewater or chemicals, to enter the clean drinking water supply, potentially leading to serious health issues like waterborne diseases.

Understanding cross-connections is essential for plumbing professionals, who must implement protective measures, such as backflow prevention devices, to ensure that potable water remains uncontaminated. Recognizing the risks associated with cross-connections informs the design, installation, and maintenance of plumbing systems, ensuring public health safety.