Keep Your Sinks Clean to Avoid Drain Flies from Moving In

Of all the pests that invade our homes, drain flies are one of the peskiest. But rest assured, it's possible to get rid of drain flies for good, as long as you're willing to spend a little time and effort. Along with fruit flies, gnats, and fleas, these tiny bugs can be very annoying.

You'll know if you have drain flies if you see the bugs around your sinks and showers. They might only measure a teeny one-eighth of an inch, but drain flies like to gather around standing water like in showers and other spots. Also known as moth flies, sewer flies, or filter flies, you can identify them based on their gray or taupe color and small, rounded wings. Despite what their name implies, though, they don't "fly" but rather hop from surface to surface. They won't go away quickly on their own either since they can live for up to three weeks with new eggs hatching as quickly as every 48 hours.

So how do you get rid of them quickly and permanently? We have the solutions you need for natural DIY home solutions with ingredients like vinegar or store-bought products, plus more helpful information like whether drain flies are harmful.

How do you get rid of drain flies permanently?

The good news is most drain fly issues can be fixed within about a week with regular cleaning and careful attention. Here are five ways to do so:

Clean your sink: Start with cleaning your sink and drain with your usual cleaning solution. Use a pipe brush to scrub around and inside the drain.
Try boiling water: A super simple fix is to pour boiling water down the drain to eliminate drain flies. Boil a medium-size pot of water once or twice per week, and pour down and around the drain.
Use baking soda: Another easy option uses baking soda: Combine 1/2 cup salt with 1/2 cup baking soda and 1 cup of vinegar, and pour down the drain. Leave overnight, and finish by pouring boiling water down the drain in the morning.
Buy a drain cleaner: If you need a heavier-duty way to get rid of drain flies, try a store-bought drain cleaner like Drano or Bio-Clean. These chemical unclogging solutions will clear out the drain and pipes and help eliminate any materials or debris that may be creating a breeding ground for drain flies, thus preventing new eggs from hatching.
Make an apple cider vinegar trap: If you're still seeing adult drain flies around, create an apple cider vinegar trap using a small dish covered in plastic wrap. Poking holes in the plastic wrap will lure flies in but prevents their escape.

pouring boiling water to unclog the kitchen sink

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Why do I suddenly have drain flies?

Drain flies love moisture—stagnant, shallow water—and organic debris, and are most likely to be found near sources of food or bacteria, like sinks and showers. They often favor areas that are not used frequently, like a basement or workshop sink, and are also spotted after a long time away from home, like a vacation. They can even pop up in a relatively clean area.

How do you know if you have drain flies?

If you spot one or two, try this overnight test: Place pieces of tape (sticky side down) over the drain in question. As they try to escape, they will become trapped on the tape, and you'll have a good indication of just how many flies you're dealing with.

Are drain flies harmful?

Nope! They don't bite humans or transmit human disease, but they are a sign that your kitchen could use a deep clean, especially if you want to prevent more insects like roaches from joining the party.