What characterizes backpressure in a plumbing system?

Backpressure in a plumbing system is characterized by a pressure imbalance that leads to the reversal of water flow. This situation occurs when the pressure in the non-potable water system exceeds the pressure in the potable water system, resulting in a condition where contaminated water can potentially flow back into the safe water supply. This is significant because it poses a health risk, as it can lead to the mixing of safe drinking water with potentially harmful substances.

Understanding backpressure is crucial for designing systems that prevent contamination due to flow reversal and ensures that cross-connections between potable and non-potable systems are effectively managed. Proper measures, such as the installation of backflow prevention devices, are therefore essential to maintain the integrity of the potable water supply and safeguard public health.