Which practice is intended to protect water supplies during pesticide mixing and loading?

• A. Use an air gap or back-flow protection device to protect your water supply when you mix pesticides.
• B. Mix pesticides directly in open basins near streams.
• C. Store pesticides on an impermeable surface without containment.
• D. Dispose of rinsate by pouring it onto soil nearby.

Answer: (A)

The main idea being tested is protecting water supplies by preventing backflow during mixing and loading. Using an air gap or back-flow protection device creates a physical barrier that stops any contaminated liquid from siphoning back into the water supply if pressure changes occur, which is the most reliable way to keep drinking water safe from pesticide contamination.

Mixing near streams or in open basins invites direct entry of pesticides into surface water. Storing pesticides on an impermeable surface without containment can still allow spills to escape and reach soil or water if something breaks or leaks. Disposing rinsate by pouring onto soil nearby can cause the residues to leach into groundwater or run off into surface water. Following proper backflow protection and rinsate disposal helps prevent these risks and protects water quality.