What is the purpose of a backflow prevention device?

The purpose of a backflow prevention device is to prevent cross-connection. Cross-connections occur when the flow of water is reversed, allowing contaminants from areas such as sewage or chemicals to enter the clean water supply. This can happen due to changes in pressure within the plumbing system. Backflow prevention devices are installed to ensure that water flows in one direction, thereby protecting the potable water supply from contamination. They are crucial in maintaining food safety and public health by preventing hazardous materials from entering drinking water systems and food preparation areas. Such devices are especially important in food service operations where water quality is critical for safe food handling and preparation.