Drain Fly Larva

Natural Habitat

Found in organic film, slime, or sludge that accumulates in drains, septic tanks, and sewer pipes.

Diet & Feeding

Feed on decaying organic matter, bacteria, algae, and fungi found in the gelatinous film layer of drains.

Behavior Patterns

The larvae develop within the sludge of drains for about 9-15 days. They are highly resilient to temperature changes and low oxygen environments.

Risks & Benefits

Primarily a nuisance; they do not bite or transmit diseases. However, large infestations indicate a buildup of organic material and can be difficult to eliminate without deep cleaning of pipes.

Identified on: 5/21/2026