Drain fly larva

Found in moist areas with organic decomposition, such as sink drains, sewers, septic tanks, and wet soil.

They feed on sludge, decaying organic matter, bacteria, and fungi found in gelatinous biofilms.

Larvae live within the slime or film of drains; they have a breathing tube that allows them to survive in semi-liquid environments. They pupate near the surface of the organic film.

Generally harmless to humans but can be a nuisance and signal a hygiene issue or clog. In small numbers, they help break down organic solids in sewage, but they can carry bacteria from the sludge they inhabit.