Drain Fly Larva

Natural Habitat

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

Diet & Feeding

Decomposing organic matter, biofilm, algae, and bacteria found in slime layers within plumbing.

Behavior Patterns

Larvae live within the gelatinous film of drains; they are remarkably resilient to soap and hot water. They undergo complete metamorphosis to become small, fuzzy, moth-like gnats.

Risks & Benefits

Generally harmless to humans but can be a nuisance and may indicate a clog or sanitation issue. They help break down organic solids in sewage treatment processes.

Identified on: 2/27/2026