What does the term "cross-connection" refer to in water systems?

The term "cross-connection" specifically refers to a physical connection between potable (drinking) water and a non-potable source. This situation poses a significant risk because it allows for the possibility of contamination of the potable water supply if backflow occurs. Backflow can happen due to changes in pressure within the water system, potentially allowing contaminated fluids to flow back into the clean water supply.

Understanding cross-connections is critical in water system management because preventing such connections is essential for maintaining the safety and quality of potable water. Regulatory standards and best practices in water system design often focus on ensuring that cross-connections are eliminated or properly controlled through methods like backflow prevention devices.

While other options mention irrigation or water treatment, these concepts do not encompass the specific risk and definition that "cross-connection" entails. Thus, the focus remains on the safeguarding of potable water systems from potential contamination hazards.