What is the main concern addressed by controlling backflow in potable water systems?

The main concern of controlling backflow in potable water systems is to avoid contamination from nonpotable sources. Backflow occurs when water flows in the opposite direction in a plumbing system, which can happen due to changes in pressure. This reversal can draw contaminants from sources such as sewage, industrial waste, or other nonpotable sources back into the clean water supply. By implementing backflow prevention mechanisms, such as check valves or air gaps, public health can be protected by ensuring that drinking water remains safe and uncontaminated, thereby preserving the health of the community.

In contrast, while system pressure drops, flow rates, and water temperature are important considerations for overall system efficiency and performance, they are secondary to the primary purpose of controlling backflow. The fundamental goal is protecting the integrity of the potable water supply from potential hazards that could lead to serious health risks.