TCFP Plans Examiner Practice Test

Why are backflow preventers required on fire protection systems?

1. To enhance water pressure

2. To reduce maintenance costs

3. To prevent contamination of downstream water

4. To increase water flow

The correct answer is: To prevent contamination of downstream water

Backflow preventers are essential components in fire protection systems because they serve a crucial purpose in maintaining water quality. The primary function of a backflow preventer is to prevent the reverse flow of water, which can occur due to changes in pressure within the water supply system. This reverse flow can lead to the contamination of clean water supplies by allowing polluted water from fire protection systems to mix with potable water. By preventing any backflow, these devices ensure that harmful substances, such as chemicals or contaminants that might be present in a fire suppression system, do not enter the public water supply. This is especially important in fire protection systems, which may use substances that could be detrimental to health if introduced into drinking water. Therefore, the requirement for backflow preventers is fundamentally about safeguarding public health and ensuring that the drinking water remains uncontaminated.