Why is backflow a concern for water distribution system operators?

Backflow is a significant concern for water distribution system operators primarily because flow from a non-potable source could contaminate the distribution system. When backflow occurs, it allows water—including potentially hazardous substances from areas such as irrigation systems, industrial processes, or contaminated groundwater—to flow back into the clean drinking water supply. This can lead to severe public health issues, including exposure to pathogens, chemicals, or other contaminants that could compromise water quality. Ensuring that the drinking water remains safe and uncontaminated is a core responsibility for water distribution operators, which is why preventing backflow is a critical focus in maintaining the integrity of the water supply.

While other factors such as physical damage to pipes, increased operational costs, and effects on water pressure are relevant issues within the overall operation of a water distribution system, the primary concern with backflow directly relates to the potential for contamination of potable water sources.