Drain Fly

Typically found in moist locations with organic matter, such as drains, sewers, septic tanks, and damp compost.

Larvae feed on the gelatinous film of bacteria, fungi, and decaying organic matter in drains; adults primarily consume nectar or liquid organic matter.

Poor fliers that often crawl or take short, hopping flights. They are most active at night and are frequently seen resting on walls in bathrooms or kitchens.

They do not bite or transmit diseases to humans. However, their presence indicates a buildup of organic slime in plumbing, and in large numbers, they can be a nuisance and potentially transport surface bacteria mechanically.