What is the purpose of a backflow preventer in a water system?

A backflow preventer is a crucial component in a water distribution system designed specifically to protect the potable water supply from contamination. Its primary function is to prevent any backflow, which occurs when water flows in the reverse direction, possibly pulling contaminants from non-potable sources back into the clean water supply. This protects public health and ensures that the water remains safe for consumption.

The use of a backflow preventer is vital in various settings where there is a risk of cross-contamination, such as irrigation systems, industrial facilities, and residential plumbing where hoses may be submerged in potentially contaminated water sources. By implementing this device, the integrity of the drinking water supply is maintained, thereby safeguarding the community against waterborne diseases and other health risks associated with contaminated water.

Other options do not align with the fundamental role of a backflow preventer, as increasing water pressure, measuring flow rates, or enhancing water flavoring are not related to preventing contamination.