Drain Fly Q & A: What You Need To Know

Have you noticed small moth-like flies hovering in and around your drains or above the sink? If so, you may have a problem with drain flies. The following can help you understand what drain flies are and what you can do about them.

What Are Drain Flies?

Drain flies are small insects, usually measuring less than a quarter of an inch long, that breed and feed where there is standing water and organic debris. Although they are the size of a gnat, their body form more closely resembles that of a moth. They are quite common outside around standing water, where they typically go unnoticed. It is when they make their way into the home that they become a problem. Any drain can become susceptible to drain flies. Floor drains are commonly affected, but kitchen and bathroom sinks, as well as the shower drain, are not immune to these pests.

What Causes Drain Flies?

Every sink in your home has a trap, which is a bend in the pipe designed to hold water and create a seal so sewage odors can't come up the pipe and into your home. Drain flies can use the trap to breed and nest. The presence of organic matter, such as soap scum, hair, grease, and food residue, can compound the problem since the organic matter will also provide a food source for the flies.

Do Drains Flies Indicate a Problem?

Drain flies alone aren't much of a hazard to drain or health, but they may indicate other issues. Water has to flush from the trap slowly if drain flies are to successfully breed, so their presence indicates there is a clog forming somewhere along the line. Developing clogs are typically rich in organic matter, which can lead to even more drain fly activity. Further, the trapped organic matter and developing clogs can lead to bad odors in the home, which can be almost as much of a nuisance as the flies themselves.

How Can Drain Flies Be Eliminated?

The only way to fully eliminate drain flies is to have clogs cleared and the organic residue removed. A full drain cleaning achieves both of these aims. Hydrojetting is especially effective because it fully blasts every bit of scum from the inside of the pipes and thoroughly clears any developing clogs. You may need to have drain cleaning completed annually to ensure the drain flies don't return.

Contact a drain cleaning service in your area for more assistance.


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