Which code must the potable water system comply with to prevent backflow?

The potable water system must comply with the Plumbing Code to prevent backflow because this code specifically addresses the design, installation, and maintenance of water supply systems, ensuring that drinking water is protected from contamination. Backflow occurs when water flows in the opposite direction, potentially allowing pollutants or contaminants to enter the potable water supply. The Plumbing Code establishes requirements for backflow prevention devices and methods, such as air gaps and check valves, which help to ensure that the water supply remains safe for consumption. By adhering to these regulations, plumbing systems can effectively mitigate the risks associated with backflow, thereby safeguarding public health.