What does the term 'cross connection' signify?

The term 'cross connection' refers specifically to a situation where a connection is made between a potable (drinking) water supply and a source of contamination. This is a critical concern in water supply management and public health because it poses a significant risk of backflow, where contaminated water can flow into clean drinking water, potentially leading to serious health crises.

Understanding cross connections is essential for maintaining the safety and integrity of a community's water supply. Proper water management practices, including the implementation of backflow prevention devices and regular inspections, are necessary to avoid such hazardous situations. This concept emphasizes the importance of protecting potable water sources from contamination, ensuring that the public has access to safe drinking water at all times.

The other options do not accurately capture the essence of what a cross connection entails, which is directly related to the risk of water contamination.