The answer to 'why is my floor mildew' is that mildew is a type of fungus that can grow on floors, especially in damp or humid environments. Mildew thrives in areas with poor ventilation, standing water, or high moisture levels. Common symptoms include a musty odor, discoloration, and visible fuzzy growth on the floor.
To address mildew on your floor, you'll need to identify and resolve the underlying moisture issue. This may involve improving air circulation, fixing leaks, or addressing drainage problems. Cleaning the affected area with a mildew-killing solution is also important to remove the existing fungus. If the mildew problem is severe or keeps returning, it's best to call a professional cleaning service to properly treat the issue.