Final answer:
Mop water should be disposed of down a sink, floor drain, or toilet to prevent environmental contamination and adhere to wastewater regulations.
Step-by-step explanation:
Proper disposal of liquid waste, such as mop water, is important for maintaining sanitation and environmental safety. The proper place to dispose of mop water is down a sink, floor drain, or “toilet, not outside on the ground or in a storm drain.
Doing so prevents potential contamination of natural water sources and complies with local wastewater regulations. It's essential to follow your local municipality's guidance for disposing of domestic liquid waste.