What is the purpose of a backflow prevention device?

The primary purpose of a backflow prevention device is to protect potable water from contamination. These devices are critical in ensuring that water used for drinking and other purposes remains safe and free from pollutants, especially in systems where water may flow in reverse due to changes in pressure. This reverse flow could occur during events such as a drop in water pressure in the main supply line or the use of equipment that draws water from the same supply.

By preventing backflow, these devices ensure that contaminants from irrigation systems, industrial processes, or wastewater do not mix with the clean water supply, thereby safeguarding public health. This protection is essential in maintaining the integrity of water systems and ensuring that everyone has access to safe drinking water.