What is the purpose of a backflow preventer in plumbing?

The purpose of a backflow preventer in plumbing is to prevent the reverse flow of contaminated water into the clean water supply. Backflow can occur due to changes in pressure within the plumbing system, which can allow water from non-potable sources, such as drainage systems or polluted tanks, to flow backward into the potable water supply lines. This can lead to serious health risks, as it may introduce harmful contaminants into the water that is safe for drinking and other uses.

By installing a backflow preventer, the plumbing system is equipped with a necessary safeguard that ensures that clean water remains uncontaminated and safe for consumption. This device is crucial in maintaining public health standards and protecting against potential waterborne diseases that could arise from contamination.