March 5, 2024

How to Handle Flies in the Bathroom

If you've ever been startled by finding flies buzzing around your bathroom, you're not alone. While the bathroom might seem like an unlikely place for these pesky insects to hang out, many factors may actually draw them near.

In this post, we’ll uncover the types of flies in Washington and further explore why they may choose to make your bathroom their next home.

Types of Flies in Washington

Let's explore the types of flies common to Washington State and determine which could make an unwanted appearance in your bathroom.

Fruit Flies: Fruit flies are a regular sight in Washington, particularly during the warmer months. These tiny flies are attracted to fermenting organic matter, such as overripe fruits, vegetables, and other decaying organic material. While they may not be exclusive to bathrooms, fruit flies can sometimes find their way into these spaces in search of moisture and food residues. Plus, if your sink or shower is full of rotting organic matter, they will likely congregate around these spots.

Drain Flies: Also known as moth flies or sewer flies, drain flies are often found in damp, organic-rich environments like drains, sewage systems, and septic tanks. These small, dark-colored flies are typically seen hovering near drains or breeding in stagnant water. While they may primarily inhabit kitchen and bathroom drains, they can also venture into other areas of the home.

Fungus Gnats: Fungus gnats are common indoor pests in Washington, particularly in areas with high humidity and moisture levels. These small, delicate flies are attracted to moist soil and decaying organic matter, making houseplants and bathroom environments prime breeding grounds.

House Flies: House flies are familiar in both urban and rural environments throughout Washington state. While they may not be exclusive to bathrooms, these flies can find their way indoors through open doors and windows, seeking food and suitable breeding sites. House flies are attracted to a wide range of organic matter, including human and animal waste, garbage, and decaying food.

Cluster Flies: Cluster flies are common in rural areas of Washington, where they seek shelter in homes and other structures during the cooler months. These large, slow-moving flies often cluster around windows, attics, and other secluded areas. While they typically do not breed indoors, they can be a nuisance when they invade living spaces in large numbers.

Why Are There Flies in Your Bathroom?

You've stepped into your bathroom and are greeted by buzzing flies. Yuck!

So, why exactly are these pesky insects congregating in your bathroom? Let's uncover the reasons behind their unexpected visitations:


Bathrooms are hotspots for humidity and moisture, providing an ideal environment for certain fly species to thrive. Flies such as drain flies and fungus gnats are attracted to the damp conditions commonly found around sinks, showers, and drains. Stagnant water in sink traps, shower stalls, or wet towels left hanging can serve as breeding grounds for these moisture-loving pests.

Ample Food

Despite our best efforts to maintain cleanliness, bathrooms can still harbor traces of organic matter that attract flies searching for sustenance. Food residues in sink drains, toothpaste splatters, or even the remnants of personal care products can provide an enticing feast for flies like fruit flies and house flies. Additionally, if you have houseplants in your bathroom, decaying plant matter in the soil can attract fungus gnats and other fly species.

Plumbing Problems

Leaky pipes, damaged seals, and clogged drains are nuisances for homeowners and invitations for flies to take up residence in your bathroom. Drain flies, in particular, thrive in the moist, organic-rich environment of drainpipes and sewage systems. Even small leaks or drips can create the perfect conditions for fly infestations to flourish.


For certain fly species, bathrooms provide more than just food and moisture – they also offer shelter from harsh outdoor conditions. During the cooler months, cluster flies may seek refuge indoors, finding their way into bathrooms and other secluded areas for warmth and protection.

Eliminating Flies in the Bathroom: Practical Strategies

Start by addressing any potential fly breeding grounds, such as clogged or stagnant drains. Regularly clean and sanitize sink, shower, and bathtub drains to remove the buildup of organic matter and debris where flies may lay their eggs. Consider using a drain cleaner or enzyme-based drain treatment to break down organic material and prevent fly infestations.

Leaks, drips, and damaged seals in your bathroom plumbing can also create moist environments that attract flies. Inspect and repair any plumbing fixtures or pipes leaking or dripping to eliminate sources of moisture. Seal gaps around pipes, drains, and faucets to prevent flies from entering your bathroom through these entry points.

You can prevent flies from entering your bathroom by sealing off potential entry points, such as gaps around doors, windows, and vents. Install screens on windows and vents to keep flies out while still allowing for ventilation. Use weatherstripping or caulking to seal gaps and cracks in your bathroom walls, floors, and ceiling where flies may gain access.

Minimize sources of food and moisture in your bathroom that may attract flies. Keep sink drains clean and dry, promptly wipe up spills and splatters, and store toiletries and personal care products in sealed containers. Consider relocating houseplants outside the bathroom or placing them in sealed containers to prevent fungus gnats from breeding in the soil.

Consider using fly traps or sticky fly ribbons to capture adult flies in your bathroom. Place these traps near windows, sinks, and other areas where flies may frequent. You can also use natural repellents like essential oils (e.g., lavender, eucalyptus) or vinegar solutions to deter flies from entering your bathroom.

Zunex Pest Control: Your Solution to Fly Infestations in Your Bathroom

black and white fly with red eyes sitting on a green leaf

When flies take up residence in your bathroom, it's time to call in the experts. Don't let flies take over your bathroom; reclaim control of your living spaces today. With our professional expertise and personalized approach, we'll banish flies from your bathroom for good.

Contact us today!

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