Backflow Prevention Practice Exam

What is a primary function of a backflow preventer?

1. Maintain consistent water flow

2. Prevent water from flowing in reverse

3. Measure water temperatures

4. Improve water pressure

The correct answer is: Prevent water from flowing in reverse

A primary function of a backflow preventer is to prevent water from flowing in reverse. This is important in protecting the potable water supply from contamination due to backflow, which can occur when there are fluctuations in the water pressure or when a cross-connection exists. Backflow can introduce harmful substances from non-potable sources into the clean water supply, leading to health risks. The design of backflow preventers, whether they are in the form of check valves, air gaps, or other mechanisms, specifically focuses on ensuring that once water has flowed in one direction, it cannot revert back, thereby safeguarding the integrity of the system. Other functions, like maintaining water flow, measuring temperatures, or improving pressure, do not directly relate to the primary mission of backflow prevention, which is solely concerned with stopping reverse flow and preserving water quality.