What does a backflow prevention device prevent?

A backflow prevention device is specifically designed to prevent the backflow of contaminated water into the clean supply of water. When there is a sudden change in pressure in the water system, without such a device, water could flow backward and mix with potable water, leading to potential contamination. This is particularly important in settings like food service or food retail where maintaining the integrity and safety of the water supply is crucial.

While water pressure issues and cross connections in the water supply are related concerns, a backflow prevention device specifically addresses the issue of cross connections where contaminated water could enter the drinking water supply. Therefore, the focus is on preventing the flow of unsafe water back into a clean system, ensuring the water remains safe for consumption and use in food preparation. This does not directly deal with pest infestations, as those are managed through different means such as sanitation and proper maintenance practices.