Drain Fly

Found in moist areas rich in organic matter such as sink drains, sewers, septic tanks, and damp crawl spaces.

Larvae feed on gelatinous film (biofilm) of algae, bacteria, and fungi; adults feed primarily on nectar or liquid organic matter.

Poor fliers that often crawl or take short, jerky flights; they are nocturnal and are frequently seen resting on walls near plumbing fixtures.

Generally harmless to humans as they do not bite; however, they can mechanically transport bacteria from sewers into living spaces if present in large numbers.