Drain Fly

Natural Habitat

Damp areas rich in organic matter, such as bathroom drains, kitchen sinks, sewers, and stagnant water.

Diet & Feeding

Larvae feed on the gelatinous film of organic sludge and bacteria found in drains; adults primarily consume liquid carbohydrates or water.

Behavior Patterns

Poor fliers that typically crawl or take short, hopping flights. They are most active at night and are frequently found resting on walls near plumbing fixtures.

Risks & Benefits

Generally harmless to humans as they do not bite or transmit diseases through stings, but they can be a nuisance and potentially transport bacteria from sewage onto clean surfaces.

Identified on: 3/11/2026