Drain Fly Larva

Natural Habitat

Moist environments rich in organic matter, such as drains, sewage pipes, septic tanks, and wet compost.

Diet & Feeding

Microscopic plants and animals, algae, fungi, and decaying organic matter found in the slime layer of drains.

Behavior Patterns

The larvae live within the gelatinous film of drains; they are able to survive in low-oxygen environments and eventually pupate before emerging as fuzzy, moth-like adult flies.

Risks & Benefits

Generally harmless to humans and do not bite; they can be a nuisance in large numbers and may mechanicaly transfer bacteria from drains to surfaces, but they also help break down organic clogs.

Identified on: 12/28/2025