Drain Fly Larva

Natural Habitat

Commonly found in moist areas rich in organic matter such as sink drains, sewers, septic tanks, and damp soil.

Diet & Feeding

Feeds on the slimy film of bacteria, fungi, and decomposing organic matter (biofilm) that accumulates in drains and pipes.

Behavior Patterns

They live aquatic or semi-aquatic lives within the sludge of drains. They are typically nocturnal and progress through four larval instars before pupating.

Risks & Benefits

Generally harmless to humans and do not bite or transmit diseases, but their presence can indicate a sanitation issue or a clog in the plumbing. They help break down organic waste in sewage systems.

Identified on: 5/13/2026