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The name for Drain Flies is derived from their preferred breeding grounds, which is inside of sinks, tubs and commercial drains. Also referred to as moth flies, this pest can turn into an overwhelming issue at alarmingly fast rates. 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.


The larvae of the Drain flies feed on the organic matter, the sediment, and decaying vegetation.

It can be challenging to identify a drain fly because they can resemble and be mistaken for miniature grey moths. Even adult flies are minute in size, and are covered with grey, short hairs on the wing and body. Held flat against the body, 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.

Elimination and control of the food source is the important first step in management. Larvae will feed on organic matter, sediment and decaying plant matters. This can 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 gel used on a regular basis works great for drains and sinks. For outdoor 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 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 resources for helpful information!

There are a number of different types of flies that swarm inside homes. 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 they type of fly that is present and the level of infestation.


A good tip 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.


The DIY method is fairly simple. You can control them 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 everyday 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 that are gel based. Follow the instructions on the bottle. The process usually involves dumping the 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 gel aournd the drain part so that it can coat the sides of the walls of the drain. You will not want to use the drains till the morning this will give it time to work.


There are also aerosol sprays that are foam. The sprays are easy to apply and the foam clings to the slime in your drains. Foaming agent act the same way in 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 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 flies we call 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.

  • Drain Gel Fly Killer

    Drain Gel Fly Killer

    Digests organic waste upon application
  • Gentrol IGR Insect Growth Regulator

    Gentrol Concentrate IGR Insect Growth Regulator

    Long Term Control 120 days, Breaks Insect Life-cycle
  • Invade Bio Drain Fly Killer

    Invade Bio Drain

    Microbial gel with proprietary citrus oil
  • Invade Hot Spot Foam

    InVade Hot Spot Bio Foam

    Quick and convenient probiotic foaming cleaner
  • Gentrol Aerosol Insect Growth Regulator

    Gentrol Aerosol Insect Growth Regulator

    Easy to apply Insect Growth Regulator Aerosol

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