What must be done to all hazmat containers when transferring?

• A. Refill as needed
• B. Store container upright
• C. Ensure they are properly labeled
• D. Seal containers with tape only

Answer: (C)

When hazmat is moved, labeling is essential so everyone handling the container knows exactly what it contains and what hazards it presents. Proper labeling communicates the exact contents, hazard class, any packing group or special handling requirements, and must align with the shipping name on the paperwork. Labels need to be clearly visible, durable, and not obscured, ensuring responders and handlers can quickly assess risk and take appropriate precautions. This requirement helps prevent misidentification, improper handling, or accidents during transfer, and it’s enforced by transport regulations.

Why the other ideas don’t fit as the main action: refilling as needed isn’t about safe transfer and can lead to overfill or compatibility issues; storing upright pertains to storage conditions rather than the transfer action itself; sealing with tape only isn’t an approved or reliable method for securing hazmat containers and can fail, risking leaks.