What is the purpose of a backflow device?

A backflow device serves the critical function of preventing contaminated water from flowing back into the potable water supply system. This mechanism is vital in protecting public health, as backflow can occur when there is a change in pressure within the water distribution system. Such changes can allow water that may contain harmful pollutants, chemicals, or pathogens to reverse its flow and enter clean water lines, potentially causing serious health risks.

The backflow device is specifically designed to create a physical barrier that stops this reverse flow, ensuring that any contaminants remain isolated from the drinking water. It often features check valves or air gaps that only allow water to flow in one direction, thereby maintaining the integrity of the water supply.

While there are devices that can measure parameters like pressure or temperature, those are separate from the purpose of backflow prevention. Increasing water pressure and storing excessive water are also not functions of backflow devices, as their sole focus is on contamination prevention and maintaining safe drinking water.