Drain Fly Larva

Natural Habitat

Moist, organic-rich environments such as drains, sewage systems, septic tanks, and damp soil contaminated with sewage.

Diet & Feeding

Feeds on decaying organic matter, sludge, microscopic plants, and algae found in drains or stagnant water.

Behavior Patterns

The larvae are aquatic or semi-aquatic and live in the slime layers of drains. They are legless, worm-like, and dark in color. They do not bite or sting but can be found crawling near drain openings before pupating.

Risks & Benefits

They are generally considered a nuisance rather than a pest. While they can carry bacteria due to their habitat, they are not known to transmit human diseases directly. However, large infestations can indicate plumbing leaks or sanitation issues. In ecosystems, they help decompose organic matter.

Identified on: 2/22/2026