Drain Fly Larvae
Scientific Name: Psychodidae family (e.g., Psychoda alternate)
Order & Family: Order: Diptera, Family: Psychodidae
Size: 3 mm to 10 mm (1/8 to 3/8 inch) in length.
Natural Habitat
Stagnant water, gelatinous organic sludge found in drains, septic tanks, and sewage systems.
Diet & Feeding
Organic matter, microscopic plants and animals, fungi, and bacteria found in biofilm/slime.
Behavior Patterns
They live in the anaerobic layer of drain slime; they breathe using a small siphon pushed through the water surface. They undergo complete metamorphosis.
Risks & Benefits
They do not bite or sting but can be a nuisance in large numbers and may transport bacteria from drains. They benefit the ecosystem by breaking down organic waste.
Identified on: 6/22/2026