The answer to 'why is my carpet mildew' is that carpet mildew is typically caused by excess moisture, poor ventilation, or water damage. Mildew thrives in warm, damp environments and can grow on carpets that have been exposed to water, high humidity, or poor air circulation.
Common symptoms of carpet mildew include a musty odor, discoloration or staining, and visible fungal growth. If left untreated, mildew can lead to more serious problems like wood rot, structural damage, and health issues for occupants.