Drain Fly (Moth Fly)

Damp, organic-rich environments such as sinks, drains, sewage systems, and compost piles.

Larvae feed on the gelatinous film of bacteria, fungi, and organic matter (biofilm) in drains; adults primarily consume liquid carbohydrates or nectar.

Weak flyers that often crawl or hop; they are most active at night and are frequently found resting on walls near plumbing fixtures. They lay eggs in the moist film inside pipes.

While they do not bite or transmit diseases through stings, they can mechanically carry bacteria from sewage to food surfaces. Their presence often indicates a need for plumbing cleaning or repair.