What is the main role of a backflow preventer?

The main role of a backflow preventer is to protect the water supply from contamination. This device is designed to ensure that water flows in one direction, preventing any potential backflow of contaminated water into the clean water supply. Backflow can occur due to changes in pressure, such as during a main water line break or when water is being siphoned from the system. By installing a backflow preventer, plumbing systems can safeguard the public health by keeping potentially harmful substances and bacteria out of drinking water sources. This is essential in maintaining water quality and complying with health and safety regulations.

While regulating water flow, measuring water usage, and conserving water are important aspects of plumbing, they do not specifically address the critical function of preventing contamination that backflow preventers are designed for.