The answer to 'why is my carpet mildew' is that mildew growth on carpets is often caused by excessive moisture, poor ventilation, or high humidity. Mildew thrives in damp environments and can lead to unpleasant odors, discoloration, and even health issues for those with allergies or respiratory conditions.
Some common causes of carpet mildew include water damage from flooding, leaks, or spills that were not properly dried; high humidity levels in the home; and lack of air circulation. Symptoms of mildew include a musty smell, visible black or green growth, and a slimy or fuzzy texture on the carpet fibers.