Drain Fly

Humid areas, particularly bathroom drains, sewers, and septic tanks where organic matter accumulates.

Larvae feed on organic sludge and microscopic organisms; adults primarily consume nectar or liquid carbohydrates.

They are weak fliers and often crawl on walls. They are nocturnal and are attracted to light and moisture.

They do not bite humans but can spread bacteria from drains to surfaces; conversely, larvae help break down organic waste.