What is the correct procedure for cleaning ground and backpack sprayers to avoid cross-contamination and environmental release?

• A. Rinse water can be poured into a nearby ditch.
• B. Wash with a strong detergent, then discard rinse water anywhere.
• C. Drain and dispose of rinse water per label; flush with clean water or approved cleaner; spray out rinse in labeled area; store clean equipment.
• D. Immediately use equipment again without cleaning.

Answer: (C)

Proper sprayer rinse-water management and cleaning is essential to prevent cross-contamination and protect the environment. Drain and dispose of rinse water according to the pesticide label, because the label provides the legal and safety requirements for handling concentrated residues and avoiding release to unintended areas. After draining, flush the system with clean water or an approved cleaner to remove any remaining residues from hoses, nozzles, and the tank. Then spray out the rinse water in a labeled area so the cleanup runoff goes where it’s permitted and won’t contaminate water or sensitive sites. Finally, store the equipment in a clean, dry state to prevent carryover and mix-ups. Pouring rinse water into a ditch, discarding rinse water anywhere, washing with a strong detergent and disposing of rinse water improperly, or reusing equipment without cleaning all increase the risk of contaminating crops, soil, and water and are unsafe practices.