Drain Fly Larva

Moist environments containing decomposing organic matter, specifically drains, sewage pipes, septic tanks, and wet soil.

Larvae feed on the gelatinous film (biofilm) of algae, fungi, bacteria, and decaying organic matter that accumulates in drains.

The larvae live within the sludge of drains and breathe through a small siphon tube that breaks the surface of the water or film. They undergo a complete metamorphosis including egg, larval, pupal, and adult stages.

They do not bite or transmit diseases to humans. While they are considered a nuisance pest when they emerge as adult 'moth flies' in homes, they are beneficial in nature for breaking down organic solids in sewage and plumbing.