What is required to prevent cross-connections in water supply systems?

The requirement to prevent cross-connections in water supply systems is primarily fulfilled by utilizing backflow prevention devices. These devices are specifically designed to stop the backward flow of contaminated water into the clean water supply, thereby protecting the potable water from pollutants and hazardous substances. Cross-connections can occur when there is a change in water flow direction, leading to potential contamination of the drinking water supply. Backflow prevention devices are essential in maintaining the integrity of plumbing systems, especially in environments where the risk of contamination is high.

While pressure relief valves, double check valves, and filtration systems play important roles in plumbing systems, they are not primarily intended for the prevention of cross-connections. Pressure relief valves are designed to alleviate excess pressure within a system, double check valves can provide some level of backflow prevention but are not as comprehensive as dedicated backflow prevention devices, and filtration systems focus on removing particulates and impurities from water rather than preventing cross-connections. Thus, the specific function of backflow prevention devices makes them essential for safeguarding the water supply against cross-connections.