Oklahoma Applicators License Core Practice Exam

What is a common method to help avoid pesticide back siphoning?

1. Mixing pesticides indoors

2. Using air-tight containers

3. Installing backflow prevention devices

4. Washing equipment before storage

The correct answer is: Installing backflow prevention devices

Installing backflow prevention devices is a crucial method for preventing pesticide back siphoning. Back siphoning occurs when the pressure in the pesticide application system drops, causing contaminated water to be pulled back into the clean water supply. By using backflow prevention devices, such as check valves or vacuum breakers, you can ensure that the flow of water is only allowed in one direction. This prevents any potential contamination of potable water from pesticides or other chemicals used in spraying. In contrast, mixing pesticides indoors, using air-tight containers, and washing equipment before storage, while important for safety and proper equipment maintenance, do not directly address the risk of back siphoning. These practices contribute to overall pesticide safety and handling but are not effective in preventing backflow incidents specifically.