Drain Fly

Damp environments rich in organic matter such as sink drains, sewers, septic tanks, and wet soil.

Larvae feed on the gelatinous film (biofilm) of algae, fungi, and bacteria in drains; adults primarily consume nectar or polluted water.

Weak fliers that often crawl on walls or surfaces; they are most active at night and are attracted to light. Their life cycle from egg to adult takes about 7 to 28 days.

Generally harmless to humans as they do not bite or transmit diseases; however, they can be a nuisance and may potentially transport surface bacteria from contaminated areas. They help break down organic matter in sewage.