The number 2 place where water leaks and mold may be growing in your home? You guested it, under the kitchen sink. Stachybotrys chartarum, sometimes called black mold, is a fungus that can produce toxins and has been linked to illness and severe allergies. It carries a powerful musty odor. When you find black mold near a sink, the problem may be the result of a leak in the plumbing since black mold requires large amounts of moisture in order to grow.