The answer to 'why is my carpet mildew' is that excessive moisture, poor ventilation, and lack of cleaning can lead to mildew growth in carpets. Mildew thrives in damp, humid environments and can cause discoloration, odors, and even health issues if left untreated.
Some common causes of carpet mildew include water damage from leaks, high humidity, poor air circulation, and infrequent carpet cleaning. Symptoms may include musty odors, visible discoloration or spotting, and even respiratory problems for those with allergies or asthma.