What is a cross-connection?

A cross-connection refers to a direct or indirect connection between potable (drinking) water and a source of contamination or unknown quality water. This situation can pose significant health risks, as it provides a pathway for harmful substances to enter the drinking water supply. Understanding cross-connections is essential for water operators because they must ensure that the drinking water system remains uncontaminated and safe for public consumption.

In the context of the provided answer, the importance of recognizing and preventing cross-connections is a key aspect of maintaining water quality and protecting public health. Proper cross-connection control measures, such as the installation of backflow prevention devices, are critical to managing this risk.

The other options do not accurately define a cross-connection. The reference to a water treatment process, inspection for water quality, or a device for checking water pressure does not pertain to the direct relationship and risks associated with the interaction of potable water and potentially contaminated water sources.