Don’t beat these small creatures with bare hands when you see them—it’s not moth, but dirty drain fly!


Most of us might have seen these small creatures flying somewhere in the toilet, drain, or any wet areas. Dark in color and seems to have a very poor ability to fly, most people think that they are some kind of moth. To our surprise, they’re not.

The next time you see them, be sure to restrain yourself from the feeling of crushing them as they are not moths, but actually, drain flies—and particularly dirty too. These drain flies often appear near a urinal and fly away once someone comes near or when they are disturbed.

Unlike the normal flies and mosquitoes, drain flies flew less than one meter at a time and stopped nearby—thanks to their poor flying ability.

Adult drain flies usually frequent the septic tanks, urinal, cesspool, drains and drainage holes—homes to spreading germs. 

Credit: setn

The presence of these drain flies represents that a place might be wet and somewhat dirty as they love dirty places. The larvae of these drain flies usually live on sewer or water pipes and feed on organic matter. As they were born in dirty drains, these drain flies’ bodies are covered in dense hair.

We might not see it, but this dense hair makes it easy for them to carry germs and pathogens when they’re flying indoors.

Credit: Judy Gallagher on flickr

When we catch and beat this drain fly with bare hands, the dirty germs will not only get in the air but transferred to our hands too. If inhaled, it may cause tracheal allergy and asthma to some people.

Hence, it is important to keep our environment clean and dry in order to avoid this drain fly. If you see them in the bathroom, make sure to pay attention to the hygiene of the bathroom and keep it ventilated. Remove any stagnant water indoors or outdoors as they love places like that.

It’s not easy to stop the growth of these flies all at once, but we can start blocking them by properly closing the drain holes.


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