Backflow protection is required for which pesticide-handling activity?

• A. Hose-end spraying and filling tanks.
• B. During mixing in closed containers
• C. Storing pesticide containers
• D. Transporting dry formulations

Answer: (A)

Backflow protection is about preventing pesticide from entering the drinking water supply when a water line is used for applying or preparing a pesticide mix. When you’re spraying from a hose-end sprayer or filling tanks, the system is connected to a water source. If pressure in the line falters or a siphon forms, contaminated liquid can be drawn back into the potable water. A backflow preventer or anti-siphon device stops that reverse flow, keeping the water supply safe. Mixing in closed containers happens in a sealed vessel that isn’t connected to a water line, so there isn’t a pathway for backflow into drinking water. Storing pesticide containers and transporting dry formulations likewise do not involve a live connection to a water supply, so backflow protection isn’t needed for those activities. Therefore, hose-end spraying and filling tanks require backflow protection.