Backflow Prevention Practice Exam

In plumbing systems, backsiphonage is caused primarily by _____.

1. High water pressure

2. Low water pressure

3. Excessive heat

4. Corrosion of pipes

The correct answer is: Low water pressure

Backsiphonage occurs when there is a negative pressure in a plumbing system that creates a vacuum effect, drawing water or contaminants back into the potable water supply. This phenomenon is primarily caused by low water pressure situations, which can occur during events such as a sudden demand for water elsewhere in the system (like firefighting efforts) or a break in the water main. When the pressure in the distribution system drops significantly, it creates a suction effect capable of pulling water from non-potable sources into clean water lines. This can lead to contamination and poses a health risk, making understanding backsiphonage crucial for ensuring safe drinking water. High water pressure, excessive heat, and corrosion of pipes do not create the necessary conditions for backsiphonage to occur; instead, they present different problems related to plumbing systems. Thus, recognizing low water pressure as the primary factor behind backsiphonage is essential for proper backflow prevention practices.