What might occur if backflow happens in a plumbing system?

When backflow occurs in a plumbing system, it refers to the undesirable reversal of flow in the system, which can lead to contamination of the water supply. This situation often occurs when there is a change in pressure within the plumbing, such as a drop in water pressure or a sudden increase, causing water to flow backward into the clean water supply lines from contaminated sources like sewers or industrial discharge.

As a result, pollutants, debris, or biological contaminants can enter the drinking water supply, posing significant health risks to individuals using that water. Therefore, the primary concern associated with backflow is the risk of pollution of the water supply, emphasizing the importance of proper plumbing safeguards, such as backflow preventers, to ensure the integrity of the potable water system and protect public health.