Where should liquid waste such as mop water be disposed of to comply with safe practices?

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

Answer: (D)

Disposing liquid waste from cleaning into the service sink keeps dirty water, grease, and detergents away from areas not designed to handle them and directs it into the building’s wastewater system safely. A mop sink is purpose-built for this purpose, with proper traps and connections to the sanitary sewer, making it easier to manage and sanitize afterward.

Putting mop water in a compost bin or a trash can is unsanitary and can attract pests or spread contamination. Draining it into a regular drain might seem convenient, but it isn’t the designated outlet for cleaning wastewater and could lead to backflow or cross-contamination in other parts of the facility. The service sink is the correct, approved disposal point for mop water and similar cleaning liquids.