Pest Control Technician Practice Exam

What does an air gap do in a water supply system?

1. It prevents airborne contaminants

2. It filters water contaminants

3. It separates a water supply outlet from a potentially contaminated source

4. It reduces the pressure in the water supply

The correct answer is: It separates a water supply outlet from a potentially contaminated source

An air gap is a crucial feature in a water supply system as it serves to separate a water supply outlet from a potentially contaminated source. This physical barrier prevents backflow, which can occur when there is an unexpected drop in water pressure or a disruption in the water supply. By maintaining a space—essentially an air gap—between the safe drinking water and any contaminated source, it ensures that pollutants or contaminants cannot enter the potable water supply. The importance of the air gap is especially emphasized in preventing situations where chemicals or biological contaminants from sinks, toilets, or any other source can accidentally siphon back into clean water systems, thereby protecting public health and maintaining water quality.