What is backflow in plumbing?

Backflow in plumbing refers specifically to the movement of contaminated water into the potable supply. This phenomenon can occur when there is a change in pressure within a plumbing system that allows water to flow in the opposite direction. It is a critical concern for public health and safety because backflow can introduce harmful pollutants or pathogens into drinking water, leading to serious health risks.

The prevention of backflow is a fundamental aspect of plumbing design, often requiring backflow prevention devices to ensure that the potable water supply remains safe and uncontaminated. Understanding this concept is vital for any plumbing professional, as it highlights the importance of maintaining pressure and ensuring the integrity of the water supply system.