What is the average size of a drain or moth fly?

The average size of a drain or moth fly is typically around 1/8 inch in length. This small size is a characteristic feature of these flies, which belong to the family Psychodidae. They are often found in damp environments, such as near drains, sinks, or sewage systems, which contributes to their common name. Their minimal size allows them to thrive in these conditions and makes them less noticeable, which can lead to issues in pest control if not identified early. Recognizing their size is essential for pest management professionals to effectively diagnose and address infestations, as it helps to distinguish them from other flies that may be larger or have different life cycles.