Indiana Pesticide Applicator Core Practice Exam

What is the primary purpose of an air gap in pesticide application?

1. To prevent human contamination

2. To prevent back siphoning

3. To enhance product effectiveness

4. To reduce the need for PPE

The correct answer is: To prevent back siphoning

The primary purpose of an air gap in pesticide application is to prevent back siphoning. An air gap is a physical separation between the end of a water supply outlet and the pesticide solution in a container or tank, ensuring that no backflow occurs. This is crucial for maintaining safety, as it protects the potable water supply from contamination by preventing pesticides from being drawn back into the water source. Without an air gap, there is a risk that negative pressure could create a vacuum that siphons the pesticide solution back into the water supply, posing significant health and environmental risks. Therefore, implementing an air gap is a critical safety practice in pesticide application to ensure that any chemicals used do not inadvertently enter drinking water or other water systems.