Texas Food Safety Managers Practice Test

What prevents contaminated water from getting into a drinkable water supply system?

1. Hose bib

2. Cross connection

3. Backflow preventer

4. Air gap

The correct answer is: Air gap

An air gap is a crucial method for preventing contaminated water from entering a drinkable water supply system. It creates a physical separation between the water supply and any potential contaminant source, such as wastewater or other fluids that may carry pathogens or pollutants. This gap ensures that even if there is back pressure or a drop in pressure in the system, contaminated water cannot flow back into the potable water source. For instance, an air gap is typically seen in configurations such as the distance between a faucet and the top of a sink. By maintaining this distance, the risk of contamination from splashes or siphoning is effectively mitigated. This is why air gaps are considered important in plumbing codes and food safety regulations, especially in facilities that handle food and beverages, where maintaining high sanitation standards is vital to prevent foodborne illnesses. In contrast, while items like backflow preventers are also designed to protect against contamination, they do so through mechanical means rather than physical separation. A cross connection refers to a connection between a potable water system and a non-potable source, which poses a greater risk if not managed correctly. A hose bib by itself does not provide protection against contamination, especially if it is not equipped with backflow prevention devices. Thus, an air gap is