Drain Fly

Found near moist areas containing organic matter, such as bathroom drains, kitchen sinks, sewers, and basement floor drains.

Larvae feed on the gelatinous film of organic slime (algae, bacteria, and fungi) found in drains; adults feed on liquid carbohydrates and water.

Poor fliers that often crawl on walls. They are nocturnal and are attracted to light. Their life cycle from egg to adult takes about 7 to 28 days depending on temperature.

They do not bite or sting and do not transmit human diseases. However, they can be a nuisance in large numbers and may mechanically transport bacteria from drains to food surfaces.