What is a cross-connection in a water distribution system?

A cross-connection in a water distribution system is defined as a physical connection between the potable water supply and a source of contamination. This is critical to understand because such connections pose significant health risks. If the potable water supply is connected to a source that could introduce contaminants—such as wastewater, chemicals, or unapproved water supplies—there is a potential for backflow to occur. Backflow can result from pressure changes in the system, leading to contamination of the clean water supply.

Recognizing the importance of preventing cross-connections is essential in maintaining public health and ensuring the safety of drinking water. Regulations and best practices in water distribution systems, such as the installation of backflow prevention devices, are designed to eliminate such hazards and protect the quality of potable water.

The other options, while related to water systems, do not accurately define a cross-connection. For instance, a connection between two water supply sources might not involve contamination, and a link between the water supply and sewage system could be part of a drainage system but doesn't specifically reference contamination risks as with cross-connections. A connection that enhances water pressure pertains to maintaining adequate system pressure rather than addressing contamination concerns.