Drain Fly

Natural Habitat

Damp environments such as sink drains, sewers, septic tanks, and wet soil.

Diet & Feeding

Larvae feed on organic matter, slime, and microorganisms in pipes; adults mostly feed on flower nectar and polluted water.

Behavior Patterns

Poor fliers that typically crawl or move in short, jerky leaps. They are primarily nocturnal and are attracted to light.

Risks & Benefits

They do not bite or transmit diseases but can be a nuisance in large numbers and may aggravate asthma; they help decompose organic blockage in drains.

Identified on: 6/18/2026