Backflow Prevention Practice Exam

What is a common application for a pressure vacuum breaker?

1. Indoor plumbing systems

2. Outdoor irrigation

3. Private wells

4. Potable water systems

The correct answer is: Outdoor irrigation

A pressure vacuum breaker is commonly utilized in outdoor irrigation systems to prevent backflow, which is the unintended reverse flow of water. In these settings, irrigation systems are often connected to a potable water supply. The pressure vacuum breaker acts by creating a physical barrier that interrupts the potential for contaminated water from the irrigation system to enter the drinking water supply, especially during events of rapid pressure changes or negative pressure in the system. While it might seem that other options like indoor plumbing systems or potable water systems could be applicable, these settings often have different backflow prevention requirements, such as double check valves or air gap systems, which are more appropriate for protecting potable water supplies in homes or buildings. Private wells, while commonly having their own types of protective measures against contamination, are not where pressure vacuum breakers would typically be the primary choice. The unique operational features of pressure vacuum breakers make them especially suited for scenarios where irrigation water can come into contact with contaminants and the risk of backflow is a significant concern.