Small moth fly (drain fly)

Adults are commonly found near sinks, drains, and other damp areas; larvae develop in the organic film inside drains.

Larvae feed on microbes and decaying organic matter in wet sludge; adults take little or no food.

Adults are weak fliers and often rest on nearby surfaces. They breed in moist organic buildup, so recurring sightings may indicate a drain-cleaning need.

Generally harmless and do not bite; large numbers are a nuisance. They help break down organic matter, though drain-breeding populations can be reduced by cleaning drains.