Drain fly larva

Natural Habitat

Moist areas with organic matter, such as drains, sinks, sewers, and septic tanks.

Diet & Feeding

Decomposing organic material, algae, bacteria, and fungi (biofilm) found in plumbing.

Behavior Patterns

Larvae live within the gelatinous film layer of drains. They are generally sub-aquatic and breathe through a small tube at the end of their body.

Risks & Benefits

Generally harmless to humans but can indicate a need for plumbing cleaning. In rare cases, they may transport bacteria from drains to food surfaces, or their decaying bodies can trigger allergies in sensitive individuals.

Identified on: 1/1/2026