Drain fly larva

Natural Habitat

Typically found in moist environments containing decomposing organic matter, such as drains, sewage pipes, septic tanks, and wet compost.

Diet & Feeding

They feed on the gelatinous film of bacteria, fungi, and decomposing organic material that builds up inside drain pipes and plumbing.

Behavior Patterns

Larvae are aquatic or semi-aquatic and breathe through a small siphon at their posterior end. They typically pupate near the surface of the organic film before emerging as adult fuzzy moth-like flies.

Risks & Benefits

Generally harmless to humans and do not bite. While they are considered a nuisance pest in homes, they benefit the ecosystem by breaking down organic sludge in drains. Large infestations can occasionally mechanical transfer bacteria from sewers to surfaces.

Identified on: 4/19/2026