Drain Fly

Natural Habitat

Humid areas with decomposing organic matter, such as bathroom drains, sewers, and septic tanks.

Diet & Feeding

Larvae eat organic slime, bacteria, and fungi; adults primarily feed on nectar or contaminated water.

Behavior Patterns

Nocturnal and weak fliers, they are often seen resting on walls near drains. They pupate within the gelatinous film where they feed.

Risks & Benefits

Generally harmless as they do not bite or transmit diseases, but large infestations can indicate plumbing issues or sanitation problems; larvae help break down organic matter in drains.

Identified on: 4/21/2026