Where should liquid waste, such as mop water, be disposed of?

• A. In a compost bin
• B. In a trash can
• C. In a drain
• D. In a service sink

Answer: (D)

Liquid waste from cleaning needs to go to a designated waste outlet designed for cleaning wastewater. A service sink (the mop sink) is built for receiving dirty mop water and other cleaning liquids and is connected to the sanitary sewer. Using this sink helps prevent cross-contamination with food areas, keeps cleaning chemicals contained, and aligns with sanitation codes.

Compost bins are for solid organic scraps, so they aren’t appropriate for liquids. A trash can isn’t suitable because liquids can leak, attract pests, and spread contamination. Pouring down a drain can be problematic unless it goes through the proper plumbing for wastewater; the service sink provides a proper, readily accessible point for disposing of cleaning wastewater.