What does "backflow" refer to in food establishment plumbing?

Backflow refers to the reverse flow of substances into potable water, which is critical to understand in the context of food establishment plumbing. This phenomenon can lead to contamination of the drinking water supply, posing serious health risks. Essentially, backflow occurs when there is a drop in water pressure in the main water supply, allowing water from an unintended source, such as a drainage system or a wastewater line, to flow back into the drinking water system.

Ensuring that there is no backflow is a key principle in maintaining sanitation standards in food establishments. Various preventive measures, such as installing backflow prevention devices, are implemented to protect the potable water supply from contamination by hazardous substances that may be present in non-potable systems. Understanding backflow is vital for sanitation enforcement agents to ensure compliance with health regulations and to maintain public safety.