What is the definition of backflow?

Backflow is defined as the unwanted reversal of flow in water systems, making the first choice the correct one. This phenomenon occurs when water flows in the opposite direction from its intended flow, which can result in contamination of the potable water supply. Backflow generally happens due to changes in pressure, such as a sudden drop in water pressure in the municipal supply or the introduction of a higher pressure source into the system, allowing contaminants to enter the drinking water system.

Understanding backflow is crucial for maintaining safe drinking water standards, as it poses significant health risks. Proper backflow prevention measures, such as the installation of backflow preventers, are essential in ensuring that water flows in the correct direction and that contaminants do not infiltrate clean water systems. This definition emphasizes that monitoring and managing backflow is a key component of water system safety and integrity.