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How To Control Drain Fliesdrain fly

It can be a startling experience to be standing in front of your sink brushing your teeth and then see flies begin to emerge from the drain. These yucky insects are known as drain flies and while they are harmless, a drain fly can be rather annoying to deal with. If left untreated, drain fly numbers can grow and you’ll be seeing a lot more of them.

Drain flies are also known as moth flies, sewer flies or filter flies and thrive in areas where there is lots of moisture and organic matter, which makes drains and sewer lines a perfect hangout spot for them. A drain fly is about an 1/8th of an inch and are usually black, but may also be colored brown. The distinguishing feature of the drain fly is the unique pattern of veins in its wings.

Drain flies frequent drains and plumbing because they are attracted to the drain buildup which forms over time. This decaying organic matter is a source of food for drain flies as well as a prime area for a drain fly to breed. Contrary to popular belief, a drain fly doesn’t come up from the drain but rather a drain fly comes from outside once they smell the organic matter.

If your drains are becoming a hangout spot for drain flies, you can eliminate them with the help of professional-grade control products from Solutions Pest and Lawn. We can also help you with free drain fly how-to advice so you can confidently take care of this pest problem yourself.

Browse our drain fly control products below. If you have any further drain fly questions or concerns regarding making an order or would like live DIY advice from trained pest control experts, give us a call, shoot us an email or live chat with us online. We’ll be happy to assist you.

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How To Get Rid of  Flies: 3 Step Solution

Drain fly control can be rather easy if you have the right approach in place. If you approach drain fly control in a way where you just buy some spray and try to spray drain flies to death, you’ll achieve little success and drain flies will keep coming back until you address the reason why drain flies are coming in the first place: the scum buildup in your drains. Once the scum buildup is cleared up, drain flies will not want to stick around. We have three simple steps you can follow to clear out your drain fly problem which we will share with you below:

Step 1: Get rid of the drain scum, you’ll get rid of the drain flies. The buildup of gunk in your drains are the reason the drain flies are around so cleaning and breaking down the organic matter will repel the drain flies. We recommend using a concentrated drain fly gel such as Forid Drain Gel Cleaner which is specifically designed to breakdown organic matter built-up in sinks, drains and garbage disposals and other areas where drain flies harbor and reproduce. Alternatively we have other drain fly gels which work great like Drain Gel and Invade Bio Drain. This drain fly gel product should be applied every night for at least 5 nights for maximum effect. Adding Gentrol into the sink can help to prevent future reinfestations of drain flies.

Step 2: Contact kill adult drain flies with insecticide spray. After you have treated your drains, the drain flies that are still alive will escape the drains and will be flying around. By using a space spray, you can treat the remaining drain flies. We recommend an aerosol like Pyrid to fog the area for a quick kill. If you'd rather not use chemicals, we suggest using Musca-Stik traps as an alternative. Musca-Stik make for a great drain fly trap. We recommend that after spraying, you leave the room temporarily to let the area ventilate before re-entering and checking for drain fly activity.

Step 3: With your drain fly problem now under control, it is time to implement preventative measures to ensure drain flies don’t return. The way to do this is by regularly cleaning your drains with drain cleaner and not allowing gunk and scum to build up which will cause drain flies to come back. Also keep rarely used drains covered with a plug to prevent drain flies from seeking out the drain.



The name for Drain Flies is derived from the preferred breeding grounds that a drain fly likes to reside in such as inside of sinks, tubs and commercial drains. Also referred to as moth flies, the drain fly can turn into an overwhelming issue at alarmingly fast rates. The larvae of the Drain flies feed on the organic matter, the sediment, and decaying vegetation. High yield, rapid breeding, and breeding grounds that aren’t always visible to the human eye can be cause for a home pest control solution to address a drain fly infestation and eliminate drain fly eggs and drain fly larva.


It can be challenging to identify a drain fly because drain flies can resemble and be mistaken for miniature gray moths. Even adult flies are minute in size and are covered with gray, short hairs on the wing and body. Held flat against the body, drain fly wings are an oval shape. Drain flies do not bite, and can be also seen congregating on ceilings or walls, and travel with a hopping flight.


Drain fly Elimination and drain fly control is best achieve by removal of the food source that is attracting the drain flies. In fact, this is the important first step in drain fly management. Larvae will feed on organic matter, sediment and decaying plant matters. This can be effectively accomplished by cleaning and removing buildups in floor or sink drains. Biomop solutions work well for removing the organic matter when mopping and drain fly gel used on a regular basis works great for drains and sinks. For outdoor drain fly issues, clean and prevent standing water and spills around trash receptacles and other common areas where drain flies appear. In many scenarios, drain flies prove to be only temporary. If a space is not frequented, and water is not run down drains, drain flies can accumulate but will be eliminated once the normal use activity starts again.


If drain flies reappear, or activity does not stop after cleaning and normal use, it will be necessary to retreat. Ensure that the source you treat is the suspected drain fly breeding ground. Use an aerosol, foam or gel bioremediation product to eliminate an infestation permanently.


Drain issues can be host to numerous pest infestations, if a secondary infestation has occurred please browse our pest control resources for helpful information!


There are a number of different types of flies that swarm inside homes aside from drain flies. When you find a swarm of flies around your sink, it is likely a swarm of drain flies. Some people will also refer to them as fruit flies, but the key is that they are surviving and breeding off the organic matter found in the drains in your plumbing. How you treat the infestation is dependent upon the type of fly that is present and the level of infestation.



A good tip to determine whether or not you have a drain fly infestation is to look at the food source around which they hover. Drain flies congregate near drains, such as those in your kitchen or bathroom. Fruit flies, on the other hand, are attracted to ripening fruit and vegetables that are going bad. Phorid flies, which are also tiny are attracted to all kinds of items, such as your garbage, moist soil, and even fruit and vegetables. Sphaeroserid flies are attracted to moist soil, drains, overly ripe fruit, manure, and even your garbage.


Looking at the food source makes it easier to determine which type or types of flies you have. Insects are usually food specific. Drain flies feed on the slime found in drains, which is how they get their name.


Filth Flies can be very hard to control because of their ability to rapidly reproduce. Homeowners may think they have killed all the adults, then a couple days later they are fighting the battle all over again.



unclog drain scum



The DIY method for drain fly control is fairly simple. You can control drain flies somewhat by cleaning your drain. Use a brush to scour out the organic slime. You can also just treat the drains around your home or business with products that are specifically designed to deal with drain flies. This is usually done every day for a week and then applied as a maintenance application so that you never have another breeding ground for drain flies again.



There are organic solutions for drain fly control that are gel based. Follow the instructions on the bottle. The process usually involves dumping the drain fly gel down the drain for 4-5 days. This is usually done in the evening so that the gel can sit undisturbed overnight. Best to run hot water in the drain before application and then pour the drain fly gel around the drain part so that it can coat the sides of the walls of the drain. You will not want to use the drains until the morning this will give it time to work.



There are also aerosol sprays which can control drain flies that are foam. The sprays are easy to apply and the foam clings to the slime in your drains. Foaming agent acts the same way in that they dissolve the organic matter, but it is able to fill the drain more effectively because it expands like foam. A new method for controlling pests  like drain flies is to use a growth regulator, such as Gentrol which is labeled for use in filth flies. These work to reduce the population by preventing the fly maggots from pupating. Without going through the pupation stage of their lifecycle, they cannot become adults.


DIY pest control offers homeowners a lot of options for the treatment of drain flies inside or outside of your home. The process is simple, and the results are good. By doing-it-yourself, you save money. Cleaning the slime out of your drains may also help to improve room odors and keep your drains and plumbing free of the nuisance drain flies. Be sure always to read the instructions on each product that you use. A good tip is to make sure the product is good to use indoors.


Get more information for drain fly and general fly control by checking out our DIY Fly control page.

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