What does a cross-connection refer to in the context of water supply?

A cross-connection refers specifically to a link between potable (safe for drinking) and non-potable (unsafe for drinking) water sources. This connection is critical to understand because it poses a significant risk to public health. When a cross-connection exists, there's a chance that contaminants from the non-potable source can backflow into the potable water supply, leading to possible waterborne diseases or chemical exposure.

This scenario is particularly concerning in plumbing systems where pressures can fluctuate, creating conditions that allow for backflow. Properly designed plumbing and the use of backflow prevention devices are essential to mitigate these risks effectively. Understanding the nature of cross-connections is vital for maintaining safe drinking water standards and ensuring public health safety.

In contrast, methods connecting pipes for irrigation, increasing water pressure, or connections between taps do not inherently involve the critical health concerns associated with cross-connections.