Drain Fly (also known as Moth Fly, Sewer Fly, or Filter Fly)
Scientific Name: Psychodidae family (Common species: Clogmia albipunctata)
Order & Family: Diptera / Psychodidae
Size: Typically 1.5 to 5 millimeters in length
Natural Habitat
Found in moist, organic-rich environments such as bathroom drains, kitchen sinks, sewage systems, septic tanks, and compost piles where larvae feed on decaying matter.
Diet & Feeding
Larvae feed on wet, decaying organic matter, slime, and algae found inside drains and pipes. Adults do not feed or drink only water/nectar.
Behavior Patterns
They are weak fliers and often look like they are hopping or resting on walls near drains. They are most active in the evening and attracted to light. Their wings are held roof-like or flat over the body, often giving them a heart-shaped appearance.
Risks & Benefits
Generally harmless to humans as they do not bite or sting. However, because they breed in sewage and drains, they can potentially transport bacteria mechanically. They are often considered a nuisance pest in homes.
Identified on: 2/20/2026