About 1/16-inch long with a light gray or tan body and lighter-colored wings. The body and the wings are covered with long hairs, giving the fly a fuzzy appearance. When at rest, the wings are folded over the body in a characteristic roof-like manner.
In homes, adults are found on bathroom, kitchen or basement walls. More active at night, do not bite and, surprisingly, do not transmit human diseases.
Organic matter and sewage.
Eggs are laid in irregular masses almost anywhere decomposing organic materials are found. Under favorable conditions, the flies can go through one generation in as little as one week. Two to three weeks is more typical.
Although they breed in sewage, drain flies apparently do not transmit human disease.