The answer to 'why is my countertop moldy' is that mold can grow on countertops due to excessive moisture, poor ventilation, or improper cleaning. Mold thrives in damp environments and can appear as discolored spots or fuzzy growths on the surface.
Some common causes of moldy countertops include leaving wet dishes or spills unattended, high humidity in the kitchen, and using harsh cleaners that don't fully remove grease and grime. Mold can also spread from other areas of the home, like leaky pipes or damp cabinets.