In water systems, what does backsiphonage refer to?

Backsiphonage refers to the reversal of water flow within a water distribution system, usually caused by a drop in pressure within the system. This phenomenon can happen when water pressure is suddenly reduced, often due to a malfunction, maintenance activities, or other disruptions. When the pressure falls below atmospheric pressure, it creates a vacuum that can pull contaminated water from a source, such as a non-potable supply or a service line, back into the potable water supply.

Recognizing that backsiphonage can introduce harmful contaminants into the drinking water is crucial for maintaining public health and safety. Proper design and management practices, including cross-connection control measures, are implemented to prevent backsiphonage and ensure the integrity of the water supply remains secure.