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Imagine this: You’re enjoying a relaxing evening in your Bellevue home, perhaps unwinding in your luxurious master bath in Medina or prepping a late-night snack in your cozy kitchen in Somerset, when you notice tiny, moth-like insects buzzing around your drains. Ugh, sewer flies! These unwelcome guests are not only annoying, but they can also be a sign of an underlying plumbing issue. Fortunately, with the right knowledge and a little elbow grease (or a call to Green House Plumbing and Heating), you can bid these pests farewell for good.

What are Sewer Flies & Why Are They in My Bellevue Home?

Those pesky little flies buzzing around your Bellevue drains are most likely sewer flies, also known as drain flies or moth flies. These fuzzy insects are typically only 1/8 inch long, with a moth-like appearance due to their hairy wings and bodies. Despite their small size, they can quickly multiply and become a nuisance.

Sewer flies thrive in damp, dark environments where organic matter-like hair, soap scum, food debris, and sewage accumulate. This is why drains and pipes are their preferred breeding grounds.

Why are they drawn to your Bellevue home? A few factors come into play:

  • Plush Landscaping: Bellevue’s commitment to lush landscaping creates a humid environment that sewer flies find attractive.
  • Older Plumbing Systems: Homes in older Bellevue neighborhoods like Enatai or Medina might have aging plumbing systems with cracks, leaks, or buildup that create the perfect conditions for sewer fly breeding.
  • Infrequent Drain Use: Guest bathrooms or floor drains that aren’t used regularly can dry out, allowing sewer flies to enter your home through the pipes.

Did you know? Sewer flies can lay up to 300 eggs at a time, and their larvae can hatch within 48 hours! That means a few flies can quickly become a full-blown infestation if you don’t take action. Here is an interesting conversation on Quora How do I know where drain flies are coming from?

DIY Solutions: Evicting Sewer Flies from Your Bellevue Drains

Don’t let those little flies get the best of you! Here are a few DIY methods you can try to rid your Bellevue home of sewer flies:

  • The Boiling Water Flush: This simple solution is often the first line of defense. Boil a pot of water (around four cups) and slowly pour it down the affected drain. The boiling water kills any sewer fly larvae and helps loosen the grime they feed on. Repeat this process daily for a few days for maximum effectiveness.
  • Baking Soda and Vinegar: A natural and effective remedy for many household cleaning tasks, baking soda and vinegar can also help eliminate sewer flies. The combination creates a fizzy reaction that helps break down organic matter and neutralize odors that attract these pests. Pour ½ cup of baking soda down the drain, followed by ½ cup of white vinegar. Plug the drain and let the mixture sit for an hour before flushing with hot water.
  • Drain Cleaners and Enzymes: While harsh chemical drain cleaners should be avoided due to their potential to damage pipes and harm the environment, there are enzyme-based cleaners available at local Bellevue hardware stores that can break down organic matter and eliminate the breeding ground for sewer flies. Be sure to choose a product specifically formulated for drains and follow the instructions carefully.
  • Sticky Traps: While not a long-term solution, sticky traps placed near the affected drain can help you capture adult flies and reduce their numbers while you address the underlying cause. Look for traps specifically designed for drain or fruit flies at your local hardware store.

Pro Tip: Remember to clean all drains in your Bellevue home, even those that aren’t visibly infested. Sewer flies can easily travel through pipes, so a comprehensive approach is necessary to eliminate them.

When to Call the Pros: Beyond DIY Pest Control

If your DIY efforts fail to eliminate the sewer flies, or if the infestation seems particularly severe, don’t hesitate to call in the experts at Green House Plumbing and Heating.

  • Professional-Grade Cleaning: We have specialized tools, such as high-pressure water jetting, that can thoroughly clean your drains and eliminate the organic matter that sewer flies love. This intensive cleaning can reach deeper into your pipes than DIY methods, ensuring that all larvae and eggs are removed.
  • Thorough Inspection: Our experienced technicians can inspect your plumbing system to identify any underlying issues that might be contributing to the sewer fly problem, such as leaks, cracks, or damaged pipes.
  • Preventative Maintenance: We offer routine drain cleaning services to help you maintain a healthy plumbing system and prevent future infestations. By scheduling regular cleanings, you can ensure that your Bellevue home remains free of sewer flies and other unwanted pests.

Pro Tip: While insecticides might seem like a quick fix, they’re not recommended for sewer flies. These chemicals won’t reach the larvae deep inside your pipes, and they can harm beneficial bacteria that help break down organic matter.

Prevention is the Best Solution: Keep Your Bellevue Drains Clean and Dry

The best way to deal with sewer flies is to prevent them from taking up residence in your drains in the first place. Here are a few preventative measures for Bellevue homeowners:

  • Run the Water Regularly: If you have drains that aren’t used often, like guest bathrooms or basement sinks, run the water for a few minutes once a week. This will help prevent the P-trap (the u-shaped pipe under your sink) from drying out, which allows sewer gases (and flies!) to enter your home.
  • Clean Your Drains Regularly: A monthly flush with boiling water or a baking soda and vinegar mixture can help prevent buildup and keep your drains smelling fresh. Consider using a long-handled brush to scrub the inside of the drain and remove any visible grime.
  • Fix Leaks Promptly: Leaks create damp environments that sewer flies love. Address any leaks in your plumbing system as soon as possible.


Sewer flies in your Bellevue home are not only annoying but also a potential indicator of a plumbing issue. By understanding these pests, taking proactive measures to prevent their arrival, and knowing when to call for professional help, you can keep your drains clean, your home pest-free, and your peace of mind intact.




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