What should be done with a pesticide container that held a class C pesticide?

Returning the container to the vendor for refilling or recycling is the correct course of action for a pesticide container that originally held a class C pesticide. Class C pesticides are considered less hazardous, but safe handling and disposal practices are still essential to minimize any potential risks to health and the environment.

Recycling or returning the container ensures that it is managed in an environmentally responsible manner. Many vendors have programs in place for the safe disposal or reuse of such containers, which helps prevent contamination and reduces waste. This practice aligns with regulations and guidelines for managing pesticide containers and mitigating environmental impacts.

The other options present less safe alternatives. Throwing the container in regular waste could lead to contamination of landfills and soil. Burning the container, unless specifically designed for such disposal, poses risks of releasing harmful chemicals into the air. Keeping the container for future use without washing is not advisable due to the potential residual pesticide that could harm future users or the environment. Hence, returning for refilling or recycling is the most responsible and appropriate action.