Which type of connection poses a risk of contamination to potable water supplies?

The type of connection that poses a risk of contamination to potable water supplies is a cross connection. This occurs when there is a physical connection between a potable water supply and a non-potable source. Such connections create a pathway for contaminants to enter the clean water supply, particularly when there is a drop in pressure or backflow conditions that can draw dirty water into the drinking water system.

Cross connections can happen in various everyday situations, such as garden hoses left submerged in buckets or incorrect plumbing installations. Due to this potential for backflow, preventing cross connections is essential in maintaining the safety and quality of drinking water. Proper cross-connection control measures, including the use of backflow preventers, are vital in safeguarding public health.