Drain Fly Larva

Natural Habitat

Moist environments high in organic matter, such as drains, sewage treatment plants, septic tanks, and wet soil.

Diet & Feeding

Scavengers that feed on decaying organic matter, sludge, algae, and bacteria found in biofilm.

Behavior Patterns

Larvae are aquatic or semi-aquatic, living within the gelatinous film of drains. They undergo complete metamorphosis (egg, larva, pupa, adult) over 1 to 3 weeks.

Risks & Benefits

Generally harmless to humans but can be a nuisance in homes. They help decompose organic matter in sewage, though large infestations may spread bacteria from drains to food surfaces.

Identified on: 12/26/2025