What is defined as a physical connection between a potable water supply and any non-potable water source?

The term that refers to a physical connection between a potable water supply and any non-potable water source is known as a cross connection. This is a crucial concept in plumbing and public health because a cross connection can lead to the contamination of the drinking water supply. If non-potable water, which could carry harmful substances or pathogens, comes into direct contact with potable water, it can introduce pollutants that pose significant health risks.

Understanding cross connection is essential for plumbers and those in related fields because regulations often focus on the prevention of such connections to ensure safe drinking water. Controlling cross connections typically involves using backflow prevention devices and adhering to plumbing codes designed to maintain the integrity of potable water systems. This is why the correct answer is recognized as a critical aspect of plumbing safety practices.