Drain fly

Humid areas with decomposing organic matter, such as drains, sewage systems, bathrooms, and kitchens.

Larvae feed on the gelatinous film of organic matter and bacteria inside pipes; adults consume liquid carbohydrates and water.

Mostly active at night; they are poor fliers and typically crawl on walls or fly short distances near their breeding sites.

Broadly harmless to humans as they do not bite, but can be a nuisance and may potentially transport surface bacteria from sewage to food preparation areas.