Drain Fly / Moth Fly / Filter Fly

Drain flies are commonly found in moist, organic-rich environments such as bathroom drains, kitchen sinks, sewers, septic tanks, and even in polluted soil. They require stagnant water or moist films to lay their eggs and for larval development.

Adult drain flies do not feed much, if at all, but may ingest liquids. Their larvae are detritivores, feeding on decaying organic matter, sludge, fungi, and microorganisms found in the moist environments of drains and sewers.

Moth flies are weak fliers and tend to hop or crawl rather than fly long distances. They are most active during the night. Their larvae live in the gelatinous film that forms in drains and pipes, feeding on organic matter. The adults often emerge from drains and are found resting on nearby surfaces.

Risks: While drain flies are not known to bite or carry diseases transmissible to humans, they can be a nuisance pest, especially in large numbers. They can also indicate underlying plumbing issues or excessive organic buildup in drains. In sensitive environments like hospitals, they could potentially contribute to the spread of bacteria. Benefits: In natural ecosystems, their larvae play a role in breaking down organic waste. In human environments, their presence can serve as an indicator of unsanitary conditions in plumbing.