Drain Fly Larva

Natural Habitat

Moist environments containing decomposing organic matter, such as drains, sewage treatment plants, septic tanks, and wet compost.

Diet & Feeding

They feed on the gelatinous film of organic sludge, bacteria, fungi, and algae that accumulates in drains and pipes.

Behavior Patterns

The larvae live within the 'slime' of drains where they consume organic debris. They are highly resilient to temperature changes and low oxygen environments. Once they mature, they pupate and emerge as moth-like flies.

Risks & Benefits

They do not bite or transmit diseases through stings, but they can be a nuisance and may potentially transport surface bacteria from sewage onto food surfaces. They benefit the ecosystem by breaking down organic matter in drains.

Identified on: 3/17/2026