Drain Fly Larva

Natural Habitat

Moist areas with organic matter buildup such as drains, septic tanks, and wet soil.

Diet & Feeding

Decaying organic matter, biofilm, and slime found in drains and plumbing.

Behavior Patterns

They live and feed within the gelatinous film layer of drains. They complete a life cycle from egg to adult in about 7 to 28 days depending on temperature.

Risks & Benefits

Generally harmless to humans and do not bite, but can be a nuisance in large numbers and potentially spread bacteria from contaminated drains to surfaces.

Identified on: 1/4/2026