Drain Fly Larva (or Moth Fly Larva)

Scientific Name: Psychoda species (Larva)

Order & Family: Diptera (Flies), Psychodidae (Moth Flies or Drain Flies)

Size: Approximately 4-10 mm in length during the larval stage.

Drain Fly Larva (or Moth Fly Larva)

Natural Habitat

Moist environments with decaying organic matter, such as drains, sewers, septic tanks, compost piles, and wet soil.

Diet & Feeding

Feeds on organic matter, including decaying plant and animal material, fungi, and biofilms that form in drains and pipes.

Behavior Patterns

Larvae develop in cracks and crevices, feeding on organic matter. They are often found in bathrooms, kitchens, and basements. They are generally slow-moving.

Risks & Benefits

Generally considered a nuisance pest, but not known to transmit diseases to humans. Large infestations can indicate a sanitation issue. They play a role in breaking down organic matter.

Identified on: 8/29/2025