Drain fly larva

Found in polluted, shallow water or highly moist organic solids, most commonly in household drains, sewer pipes, and septic tanks.

Consists of decomposing organic matter, fungi, algae, and bacteria found in the gelatinous film or slime layer of drains.

Larvae live within the slime layer of plumbing; they use a breathing tube to take in air from the surface. They undergo complete metamorphosis, pupating near the surface of the slime before emerging as adults.

Direct risks to humans are low as they do not bite; however, they can mechanically transport bacteria from sewers into living spaces. Beneficially, they help break down organic blockages in plumbing systems.