Define the term "cross-connection" in water distribution.

The term "cross-connection" specifically refers to an actual or potential connection between a potable (drinkable) water system and a non-potable (not safe for drinking) source. This definition underscores the significant risk associated with cross-connections, as they can lead to the contamination of the clean water supply. If a non-potable source, such as an irrigation system or a waste pipe, becomes pressurized, it can potentially backflow into the potable water system, posing serious health risks.

Understanding cross-connections is crucial in water distribution management to ensure public health and safety. Regulations and prevention methods are often put in place to monitor and eliminate cross-connections, thereby protecting the potable water supply from contamination. This awareness and management play a pivotal role in water safety standards and public health initiatives.

The other options do not capture the essence of what a cross-connection entails, as they either describe different types of connections or are unrelated to the definition of cross-connections in the context of water distribution.