Is there a trap for drain flies?

Author: Ashly Collins  |  Last update: Thursday, June 18, 2026

One way is to set a trap — a bowl containing one part water, one part sugar, and one part white vinegar. Add five to eight drops of dish soap. Leave the bowl overnight, and adult drain flies should be attracted to it. Another method is to create a do-it-yourself spray containing equal parts warm water and dish soap.

How do I permanently get rid of drain flies?

Apple cider vinegar with a drop of dish soap: leave in a shallow plate or bowl (I used a tiny fish bowl from thrift store) near drains to catch those flying around. They will fly in and drown. Replace every day or every other day as needed.

What is the best trap for drain flies?

Apple cider vinegar with a drop of dish soap: leave in a shallow plate or bowl (I used a tiny fish bowl from thrift store) near drains to catch those flying around. They will fly in and drown. Replace every day or every other day as needed.

Why do I suddenly have drain flies?

Drain flies thrive in stagnant and standing water. Common sources include slow or clogged drains, rarely used and unused toilets, refrigerator drain pans, and standing water created by leaking pipes. They typically enter buildings through basements, windows, and drains.

How to find out where drain flies are coming from?

Drain flies feed on filth and scum that can build up in areas such as drains, drain openings, sewers, septic tanks, and kitchen sinks. A great way to identify which drain-source the flies are coming from is to put clear tape over the drain so that they will fly into it and get stuck.

How To Deal With Fruit Flies And Drain Flies

How long does a drain fly infestation last?

Learn the Pest Biology

Knowing the life cycle helps you fight fly infestations. Life Cycle: Adult females lay 30–100 eggs in sludge around sewage and drainage areas. Eggs hatch in 32–48 hours, larval stage lasts 8–24 days, pupal stage 20–40 hours. Adults live about two weeks.

How to figure out where flies are coming from?

Most of the time, flies live in organic materials. Check for flies in places like the soil around houseplants or in your trash. They're also commonly found in bathrooms or in areas around or inside drains. You should also check for gaps along your house's foundation, windows, and doors.

Do drain flies always mean a leak?

An ongoing or recurring infestation, despite careful sanitation of all drains, can indicate a broken pipe or leak under a slab or in a crawlspace beneath the home.

Can drain flies make you sick?

Respiratory Problems: Difficulty breathing, wheezing or coughing might also be a sign. This is due to airborne allergens from insects like Drain Flies. Eye and Nose Irritation: Symptoms like a runny nose and watery, itchy eyes are common in case of insect allergies.

How to prevent drain flies from returning?

It can be difficult to prevent drain flies completely, but you can reduce the chances of them being attracted to your drains by keeping them clean. This is as simple as refraining from putting clog-inducing items down the drain, like coffee grinds, rice, solid foods, hair, and more.

What smell do drain flies hate?

Peppermint, eucalyptus, and tea tree oils are especially beneficial. Pour a few drops of the chosen oil with water down the toilet. The oils' pungent aroma repels drain flies and disturbs their breeding cycle. To keep the solution effective, reapply it every few days.

What is the best product to get rid of drain flies?

Vinegar and baking soda: Pour 1/2 cup baking soda and 1 cup of vinegar down the drain.

Will bleach get rid of drain flies?

The simple answer is yes but with a caveat. While bleach can kill drain flies and their larvae on contact, it's not the most effective method for long-term control. Bleach's caustic nature allows it to clean the drain pipes and kill some of the larvae.

Can you pour boiling water down the drain?

Pouring boiling water is quite risky as it might lead to a steam burn or scalding. Another thing to keep in mind is what type of material you are pouring in into. If you have a porcelain sink, it is likely to crack due to the heat. All in all, pouring boiling water down your drain will only cause issues down the road.

What attracts drain flies?

Drain flies are attracted to small amounts of stagnant water they find in plumbing pipes, sinks or other drainage areas. The flies feed on tiny amounts of bacteria, algae and sewage, so you can find them gathering around kitchen and outdoor sinks, shower and bathtub drains, basement sinks, sewers and septic tanks.

How do I control drain flies in my house?

Covering drains with screens can also prevent drain flies from entering and breeding in the drain. Properly disposing of food waste and other organic material can also help to prevent drain fly infestations. In conclusion, borax can be an effective and natural way to get rid of drain flies.

How long does it take for drain flies to go away?

A cup of household bleach is generally more than sufficient to kill most drain flies, and all you need to do is pour it down the affected drain. The chemical is strong enough to kill the larvae, and the rest of the adult flies should die off within a few hours to a day or so.

Can drain flies come from the toilet?

Drain flies are most often the result of a drain or sewer clog, one that limits the flow of wastewater. Unused toilets, refrigerator drains and leaking pipes can also cause them. As we previously mentioned, these insects thrive in stagnant water. What's more stagnant than a backed up drain?

Can drain flies lay eggs in humans?

However, it is also known to occur in other animals, including humans. The insects lay their eggs on the skin, which hatch into larvae that burrow into the skin, causing irritation and secondary infections.

What temperature kills drain flies?

While this won't kill adult drain flies that have the biological defenses to withstand it, boiling water will kill larvae and eggs. Use a mixture of equal parts salt, baking soda, and vinegar, and pour it down your drain. The mixture may fizzle and foam, but it can also help clear out your drains.

Why do drain flies come out at night?

During the day, you'll notice drain flies resting on the wall since they aren't good fliers. At night, when they are active, they will congregate towards light sources, like lampshades. They will also feed and breed at night, so you'll see them near food sources or breeding areas.

How to trap drain flies?

Soap, Water, Vinegar, and Sugar? Add a few drops of dish soap in a basin of water, sugar, and apple cider vinegar. Allow the bowl to sit near the drain for a few days to attract drain flies to the sweet solution. The soap will trap the flies in the water due to its thickness.

What smell do flies hate?

Cinnamon – use cinnamon as an air freshner, as flies hate the smell! Lavender, eucalyptus, peppermint and lemongrass essential oils – Not only will spraying these oils around the house create a beautiful aroma, but they will also deter those pesky flies too.

How to find the source of drain flies?

Drain flies, also known as moth flies, sewage flies, and filter flies, like to lay their eggs in wet organic matter. Organic matter can typically be found in clogged and greasy drain pipes in kitchens and bathrooms, storm drains, moist compost, and septic tanks.

What is the best homemade house fly trap?

The best homemade fly trap is one that can attract both house flies and fruit flies. To lure both outdoors, mix scraps of rotting meat, like fish or chicken, with sugar or honey. When indoors, the best bait is old fruit or honey. Liquid dish soap is exactly what you need to drown the flies.

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