Which of the following is NOT typically a reason for installing a backflow preventer?

The correct answer is C, as reducing water pressure is not a typical reason for installing a backflow preventer. The primary function of a backflow preventer is to ensure that the flow of water in plumbing systems remains in one direction, thereby avoiding contamination of potable water supplies.

Backflow preventers are critical in protecting the drinking water supply by preventing harmful substances from being siphoned back into the clean water system. They also serve to prevent sewage from entering clean water, which is vital for public health and sanitation. In agricultural settings, they help to stop contaminants from irrigation systems from getting into the water supply.

While managing water pressure is an important aspect of plumbing systems, it is typically addressed through pressure regulators and not through backflow prevention devices. Therefore, reducing water pressure does not align with the primary function of backflow preventers.