Backflow Prevention Practice Exam

An indirect cross-connection indicates that the system may be subject to what?

1. An air gap separation

2. Backpressure

3. Backsiphonage only

4. A meniscus

The correct answer is: Backsiphonage only

An indirect cross-connection suggests that there is a possibility for backflow under certain conditions, specifically backsiphonage. This scenario can occur when there is a negative pressure in the water supply line that allows contaminated water to be drawn back into the potable water system. In the context of backflow prevention, it is critical to understand that backsiphonage typically happens due to a sudden drop in pressure in the distribution system, such as during a water main break or high water demand. An indirect cross-connection does not provide a physical barrier like an air gap does; rather, it can create conditions that may lead to backsiphonage if not properly managed. While backpressure is a form of backflow that can occur with direct cross-connections and pressurized systems, an indirect cross-connection primarily relates to backsiphonage. Similarly, an air gap separation is a preventative method and is not an indication of potential risks, and the presence of a meniscus is not directly related to backflow issues. Therefore, the focus correctly lands on backsiphonage as the concern associated with an indirect cross-connection.