Iowa Pesticide Applicator Practice Exam

What is one way to avoid pesticide contamination of groundwater?

1. Mix and load pesticides anywhere

2. Mix and load at least 50 ft from water sources

3. Use less than recommended amounts

4. Apply pesticides only during rain

The correct answer is: Mix and load at least 50 ft from water sources

Mixing and loading pesticides at least 50 feet from water sources is essential for minimizing the risk of groundwater contamination. This practice creates a buffer zone that helps prevent accidental spills or drift from occurring close to bodies of water, which could lead to pesticide residues entering the water supply. Groundwater is susceptible to contamination because pesticides can seep through the soil and enter aquifers, especially in areas where the soil is sandy or has a high permeability. By adhering to the practice of maintaining a significant distance from water sources, applicators reduce the likelihood of pesticides reaching groundwater. In contrast, mixing and loading pesticides anywhere lacks the precaution necessary to safeguard water sources, using less than recommended amounts does not inherently address the risk of chemical runoff, and applying pesticides only during rain could result in increased runoff and mobility of chemicals, possibly contaminating both surface water and groundwater.