What is the primary function of a backflow preventer?

The primary function of a backflow preventer is to prevent contamination of drinking water. This device is crucial in ensuring that the water supply remains safe and potable by stopping the reverse flow of water, which can occur when there is a change in pressure within the system. This reverse flow can introduce pollutants or contaminants from non-potable sources back into the drinking water supply, posing significant health risks to consumers.

Backflow preventers are strategically installed in water systems, particularly in areas where there is a potential for contamination due to cross-connections with irrigation systems, industrial processes, or other non-potable water sources. By effectively blocking this reverse flow, backflow preventers safeguard the integrity of the drinking water supply, contributing to public health and safety. The importance of this function emphasizes the need for proper installation and regular maintenance of backflow prevention devices in water distribution systems.