What is a cross-connection?

A cross-connection is defined as a physical link between potable (drinking) water and non-potable water sources. This type of connection poses a significant risk because it can allow contaminants or pollutants from non-potable sources to backflow into the drinking water supply, which can lead to serious health risks and public safety issues. Recognizing the distinction between potable and non-potable water is crucial for maintaining water quality and ensuring that the water delivered to consumers is safe for consumption.

In the context of the other options, a connection between two water mains does not necessarily involve the contamination risk that defines a cross-connection. Testing water quality is an important practice in water management, but it does not correlate with the physical connection aspect of a cross-connection. Similarly, while water treatment processes are vital for ensuring clean water supply, they do not pertain to the direct issue of cross-connections and the risks they pose. Understanding the specific nature of cross-connections is essential for effective water distribution and public health protection.