Drain Fly

Damp environments high in organic matter, such as bathroom drains, sewers, septic tanks, and compost piles.

Larvae feed on the gelatinous film of bacteria, fungi, and organic sludge found in drains; adults feed on liquid carbohydrates and sewage.

Poor fliers that often crawl on walls near drains. They are most active at night and have a life cycle of 7 to 28 days from egg to adult.

They do not bite or transmit diseases to humans but are considered a nuisance pest. They can benefit ecosystems by helping to break down organic matter in sewage and compost.