Tiny flies near a sink may be attracted to food residue in drains, a damp trash area or fruit on the counter. Fuzzy, triangular-winged drain flies are especially associated with organic film in wet plumbing areas, but not every small fly by a sink is a drain fly.
Identify the fly before treating the drain
Look for flies with fuzzy, mothlike wings resting on walls close to drains. Smooth-bodied tan flies may be fruit flies coming from produce or recycling instead. Observe where they repeatedly appear.
Clean accessible organic buildup
Remove the strainer and scrub removable parts, the drain opening and accessible interior surfaces according to fixture guidance. Cleaning away slimy residue matters more than repeatedly pouring a strong chemical into a clogged pipe.
Look for hidden moisture
Check beneath the sink for leaks, wet cabinet bottoms or damp garbage containers. In bathrooms or utility rooms, unused floor drains and standing water can also be relevant. If a persistent swarm seems to emerge from inside pipes, consult a plumber or pest professional.
What not to do
Never mix drain cleaners, bleach, vinegar or ammonia-based products; combinations can release dangerous gases. Do not assume boiling water is safe for all pipes, seals or fixtures. Use mechanical cleaning and product labels instead.
Frequently asked questions
Will pouring bleach down a drain kill the flies?
It may not remove the organic film that supports larvae, and chemical misuse creates hazards. Cleaning and fixing moisture sources are more dependable.
Why do flies return after I set a trap?
The adults may be caught, but new ones emerge if the breeding area remains.
Related reading: how to get rid of gnats in kitchen.
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