Drain Fly (Moth Fly)

Damp areas with organic matter, such as drains, sewers, septic tanks, and wet soil.

Larvae feed on the gelatinous film (biofilm) of algae, bacteria, and fungi that forms in drains; adults feed on liquid carbohydrates and water.

Weak fliers often found resting on walls near drains. They are most active at night and have a short life cycle of about 1 to 3 weeks.

They do not bite or transmit diseases directly to humans, but can be a nuisance and potentially transport bacteria from sewage; they benefit ecosystems by breaking down organic waste.