Drain Flies (Moth Flies) in Bathrooms and Kitchens: How to Remove Them

Small, fuzzy, moth-like flies that hover near sinks and drains are probably drain flies.

The short answer

Drain flies breed in the slimy film that builds up in drains, traps and damp areas. Remove the breeding source by scrubbing drains with a brush, cleaning with suitable cleaners, flushing with hot water as pipes allow, and fixing leaks. Clean floor drains and overflow areas. Spraying adults alone does not work. If they keep coming back, a plumber or professional may need to inspect.

Identification

• Small, fuzzy, moth-like flies.
• Weak fliers resting near drains and walls.

Remove the source

1. Scrub inside the drain and the trap.
2. Clean overflow openings and floor drains.
3. Use a drain cleaner suitable for your pipes.
4. Fix leaks and standing water.
5. Repeat weekly for a few weeks.

Prevention

• Run water regularly in unused drains.
• Keep sinks and floor traps clean.
• Cover unused drains.

When to call a professional

If the problem is widespread, keeps returning or you are unsure what you are dealing with, a professional inspection will save time and avoid wasted effort.

Frequently asked questions

Do they bite?

No.

Are they harmful?

Mostly nuisance, but they show hygiene issues.

Do bleach and boiling water work?

Use what is safe for your pipes.

Why do they return?

Film or leaks remain.

This guide is part of IPest's complete resource on fly control. For identification help, prevention and treatment options, see our full fly control guide for Bangalore.