What is the primary purpose of a backflow preventer?

The primary purpose of a backflow preventer is to prevent water from flowing back into the supply. This device is critical in maintaining the integrity of potable water systems by ensuring that contaminated water or non-potable water does not siphon back into the clean water supply.

Backflow can occur due to changes in pressure, such as when there is a sudden drop in the municipal water supply or when water flow is reversed due to a secondary source. The backflow preventer is designed to stop this reverse flow, protecting the drinking water from pollutants and contaminants that could pose serious health risks to the users.

Understanding the role of a backflow preventer is crucial for anyone involved in plumbing, water safety, or public health, as it directly addresses critical issues of water quality and safety.