Drain Fly

Damp, organic-rich environments such as bathroom drains, sewage treatment plants, and septic tanks.

Larvae feed on decaying organic matter, slime, and microorganisms found in drains; adults primarily feed on nectar and polluted water.

Poor flyers that crawl or hop; they are most active at night and lay eggs in the gelatinous film that lines drains and pipes.

Non-biting and generally harmless to humans, but can be a nuisance and may mechanistically transfer bacteria from sewage to food surfaces; they help decompose organic sludge.