What is the most important reason for maintaining continuous pressure throughout the distribution system?

Maintaining continuous pressure throughout the distribution system is crucial primarily to prevent contamination from backflow. When the pressure in the water system drops, it creates a condition where the potential for backflow increases. Backflow occurs when water in the distribution system flows in the opposite direction, which can lead to contaminants from outside sources—such as soil, sewer systems, or other non-potable systems—entering the potable water supply. This can pose significant health risks to consumers and compromise the safety of the water supply.

A consistent pressure helps ensure that the water can only flow out of the system, preventing any reverse flow of contaminated water into the system. This protective measure is essential for safeguarding public health and maintaining the integrity of the distribution network.