Backflow Prevention Practice Exam

What is the purpose of a reduced pressure zone assembly in backflow prevention?

1. To maintain constant pressure

2. To prevent backpressure

3. To provide a water supply line

4. To reduce potential contaminants in water

The correct answer is: To reduce potential contaminants in water

A reduced pressure zone assembly is specifically designed to prevent contaminated water from flowing back into the potable water supply. Its primary function is to create a barrier against backflow, which can occur when there is a drop in water pressure, allowing potentially harmful substances to enter the clean water system. The assembly achieves this by featuring two check valves separated by a chamber that is kept at a pressure lower than the system pressure. This design ensures that if backpressure or back siphonage occurs, the contaminated water will not be able to move past the assembly and into the safe water supply. Therefore, its main purpose centers on protecting the water supply from potential contaminants, ensuring compliance with health and safety standards. While maintaining constant pressure, preventing backpressure, and providing supply lines are relevant to water systems, they do not encompass the comprehensive protective role that reduced pressure zone assemblies play in backflow prevention.