Drain Fly Larva

Natural Habitat

Found in moist environments rich in organic matter, such as bathroom drains, septic tanks, and sewer pipes.

Diet & Feeding

Consumes the organic slime (biofilm), fungi, and bacteria that accumulate inside drain pipes and wet crevices.

Behavior Patterns

The larvae live within gelatinous films in drains; after finishing their larval stage, they pupate and emerge as small, fuzzy adult flies often called moth flies.

Risks & Benefits

They do not bite or sting and are generally harmless to humans, but their presence can indicate a build-up of organic waste or standing water that needs cleaning.

Identified on: 5/23/2026