What is the main use of backflow prevention devices in water distribution systems?

Backflow prevention devices are essential components in water distribution systems primarily designed to prevent contamination of potable water supplies. When there is a change in pressure in the system or when water flows in the opposite direction—often due to backpressure or backsiphonage—these devices function to ensure that potentially contaminated water does not flow back into the clean water supply. This is particularly important in safeguarding water quality by protecting against various pollutants that could pose health risks to the public.

While other aspects of water system management, such as flow rate, water pressure, and usage measurement, are important, they do not address the critical need for contamination prevention. The overall safety of the drinking water supply relies significantly on the effectiveness of backflow prevention mechanisms.