Drain Fly (Moth Fly)

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

Larvae feed on decomposing organic matter and the biofilm (slime) found in pipes. Adults feed on liquid carbohydrates and nectar.

They are poor fliers and are typically seen crawling on walls near drains. They are most active at night. Their life cycle from egg to adult takes about 1 to 3 weeks.

They do not bite or sting and are not known to transmit diseases to humans. They are generally considered a nuisance pest. Benefits include the larvae helping to break down organic material in sewage systems.