What type of plumbing system is required to avoid cross-connections?

A properly separated potable and non-potable water system is essential to avoid cross-connections, which occur when water from an unsafe source can mix with the potable water supply. This separation ensures that there is no potential for contamination of drinking water, providing a clear barrier between the two types of water systems.

In plumbing systems, a cross-connection can lead to serious health hazards if non-potable water—such as wastewater or irrigation water—somehow enters the potable water supply. By employing a dual system, where potable and non-potable water are kept entirely distinct from each other, the risks associated with cross-contamination are significantly mitigated.

This practice aligns with plumbing codes and standards aimed at protecting public health and safety. Essentially, by maintaining these clear separations, plumbing systems can operate safely, ensuring that the water delivered for drinking and cooking is clean and safe, free from pollutants or contaminants.