Even so, the moth fly is the insect most closely associated with being a drain fly. Drain fly life cycle. Drain flies complete their life cycle between 21 and 27 days. Females lay eggs in a damp ...

Drain fly larvae, known as maggots, can also develop in water. The larvae are often overlooked, however, because they are so small. The life cycle of a drain fly can last anywhere from 8 to 24 ...