Backflow Prevention Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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Which type of backflow condition is caused by a drop in water pressure in the supply line?

Backpressure

Backsiphonage

The type of backflow condition caused by a drop in water pressure in the supply line is backsiphonage. Backsiphonage occurs when there is a negative pressure or a vacuum created in the water supply system, often due to a significant drop in pressure. This can happen, for instance, during a water main break or when there is sudden high demand for water. The resulting pressure drop may allow contaminants from another source to be drawn into the potable water supply through cross-connections.

Understanding backsiphonage is essential for backflow prevention because it highlights the importance of maintaining adequate pressure in the water supply system to prevent unwanted backflow into the drinking water. By identifying conditions that can lead to backsiphonage, water safety professionals can implement necessary measures, such as installing vacuum breakers or air gaps, to protect the integrity of the water supply.

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Static pressure

Cross-connection

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