Why do drain flies fly in your face?

Drain flies may fly in your face because they are attracted to moisture and light. These tiny insects, also known as moth flies or sewer gnats, tend to exhibit erratic flight patterns, which can lead them into close proximity with humans. In this article, we will provide a concise explanation of why drain flies may fly in your face and what you can do to minimize these encounters.

Understanding Drain Flies

Before we address their flight tendencies, let’s briefly understand drain flies. They are small insects commonly found in and around drains, sewers, and other damp areas. Drain flies lay their eggs in the slimy film that accumulates inside drains and primarily feed on organic matter and bacteria found in these environments. Adult drain flies are characterized by their small size and fuzzy appearance.

Reasons Why Drain Flies May Fly in Your Face

  1. Attraction to Light: Like many flying insects, drain flies are drawn to light sources. When indoor lights are on, especially in dimly lit areas like bathrooms or kitchens, drain flies may be attracted to the light. Consequently, they can inadvertently fly near your face while trying to reach the light source.
  2. Seeking Moisture: Drain flies are naturally attracted to moisture. If there is moisture on your skin or in the air, such as after a shower or when you have wet hair, drain flies may be drawn to it. As a result, they can fly near your face while searching for moisture.

Mitigating Drain Fly Encounters

To reduce the likelihood of drain flies flying in your face, consider these preventive measures:

  1. Dim Lights: Reduce indoor lighting in areas where drain flies are present to minimize their attraction to light sources.
  2. Seal Entry Points: Seal gaps and cracks in windows and doors to prevent drain flies from entering your home.
  3. Maintain Clean Drains: Regularly clean and sanitize your drains to remove the organic matter and bacteria that attract drain flies.
  4. Use Screens: Install screens on windows and doors to keep drain flies and other insects out while allowing fresh air to circulate.
  5. Proper Ventilation: Ensure proper ventilation in bathrooms and kitchens to reduce humidity levels, making your home less appealing to drain flies.


In conclusion, drain flies may fly in your face due to their natural attraction to moisture and light. While this behavior can be bothersome, it is not harmful. By understanding the reasons behind it and implementing preventive measures, you can minimize encounters with drain flies and create a more comfortable living environment.

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