What is the purpose of a backflow prevention device?

The purpose of a backflow prevention device is to prevent contaminated water from flowing back into the potable water supply. This is essential for maintaining the safety and quality of drinking water. Backflow can occur when there is a difference in pressure within the plumbing system, allowing potentially harmful substances from waste systems, irrigation systems, or industrial processes to reverse flow and enter the clean water supply. By installing a backflow prevention device, the risk of contamination is mitigated, thereby protecting public health and ensuring that the potable water remains safe for consumption.