Flies in drain go by various names such as drain flies, sink flies, or sewer gnats. The thing is that they can live in moist areas. The places where you are most likely to find these flies are sinks, tubs, or showers.
They multiply quickly and can be an indication of a hidden problem in your plumbing. Although flies in drain are not our direct problem, as they do not bite or carry diseases, they can become a source of allergy and asthma for sensitive people, therefore, they are a health-conscious family’s enemy.
What Do Drain Flies Eat?

Knowing exactly the answer to the question of what do drain flies eat is very important if you want to solve the problem.
- Drain Flies indulge themselves with decomposition materials found in the slime film called biofilm. This film accumulates on the inner walls of drains, pipes, and traps.
The components of this biofilm include hair, grease, soap scum, food particles, and other organic debris. - The larvae are the ones that are totally happy in this environment because to them it is a never-ending buffet of bacteria, fungi, and microscopic life forms that can usually be found in the goo. Adult flies drink dirty water but their main meal comes from the sludge that is inside your plumbing.
- Thus, an ultra-clean kitchen or bathroom can still be the perfect place for these pests if under the sinks there is enough organic stuff. So, if you are still asking what do drain flies eat, they are largely dirty, damp, and full of organic matter hyphens that are located deep inside your pipes.
- It is undeniable that the more organic material there is, the more food there is for the pests. This is one of the main reasons why cleaning and maintenance on a regular basis are very important.
If your health is a major concern, learning good things about the nutrition of drain flies will definitely make you realize that getting rid of drain buildup is the only way to have a house free from pests.
Reason for Flies in Drain
The cause can be found in the inside of your pipes. The flies are feeding on water, which is either still or moves very slowly. The most common reasons for the flies in drain are:
- Blocked Drains- Drains that are blocked or slow can lead to accumulation organic matter and moisture.
- Leaked Pipes- Leaks in pipes or water that is not being drained. Places where the water movement is absent, such as sinks or toilets that are rarely used, allow biofilm to accumulate.
- Fly nests in the outside environment may provoke cracks or gaps in the plumbing where flies can easily enter.
For instance, if you have been on a vacation and have returned back or you have an unused sink for some time, you may suddenly find that there are flies in drain.
The major cause for the flies in drain is the moisture and the organic matter, which are the exact things that pests need for their feeding, and moreover, it provides them with fields for reproduction. The first action should be the elimination of such factors if you are willing to get rid of the infestation.
Best Drain Fly Killer

Are you looking for the most effective drain fly killer? A good one is that which takes care of both the adult flies and the place where they lay their eggs. Here is an easy way to get the job done correctly:
Clear the Drains Completely:
Take a plumbing snake or a stiff brush for this work and remove biofilm and other dirt from the pipes. It cuts the larvae food source and interrupts their reproduction.
Enzymatic Drain Cleaners:
These are natural enzyme-based cleaners that digest the organic matter present inside the pipes. The enzymes are therefore the best drain fly exterminator option for families who are concerned about their health. Stay away from aggressive chemicals since they have the potential to destroy the pipes and pollute the environment.
Boiling Water:
A quick pouring of boiling water down a drain can go a long way in loosening a part of the dirt and flushing the larvae out as well. Make it your daily habit and repeat this process for seven consecutive days for maximum effect.
Trap and Monitor:
The easiest way to catch pests is to use a trap. You can set it, for example, be a clear plastic cup that is destained with petroleum jelly, thus, over the drain, it will be eliminated overnight. The principle of this trap is that it will grab new emerging flies thus enabling you to track their source.
Fix Leaks and Eliminate Standing Water:
In order to do this, you have to mend any plumbing leaks and also make sure the water is circulating in all drains so that there is no stagnant water.
In case you find the situation getting out of your hands, professional pest control may be the best solution. They will locate invisible places where the pests are breeding and then carry out the action targeted only at the place where the problem came from thus, they will eliminate the issue once and for all.
Getting rid of both the source of their food and the breeding places will protect your home, help it to breathe freely, and will keep it pest-free.
Conclusion : Flies in Drain
Drain flies are not only a nuisance but they also are an indication that your plumbing is in need of repair. Take care of your drains, fix any moisture problems, and you are good to go. You will be able to protect your home and your health from these bothering pests that do not go away easily.
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