Drain Flies In Septic Tank

If you have drain flies in your septic tank, you may be wondering what the best ways to get rid of them are. After all, while they may have started in your septic tank, it’s only a matter of time before they spread to the rest of your house.

So keep reading to find out how to get rid of drain flies in your septic tank, as well as learn what’s causing them and whether there are any benefits or problems with letting them stay!

What Causes Drain Flies In A Septic Tank

Out of all the places drain flies could live, your septic tank is probably the most ideal spot for them. A septic tank is going to provide drain flies with everything they need to live and thrive!

First of all, drain flies are going to be attracted to any areas that are damp or have standing water. Shallow dirty water is normally their go-to, and as you can imagine, this is going to be abundant in a septic tank!

As well as this, septic tanks provide the ideal food source for drain flies as well. One of the reasons they love septic tanks is because they’re full of organic material they can eat.

Lastly, drain flies also love humidity. You should now be beginning to see why your septic tank is ideal for drain flies. They provide everything they’ll need to thrive. Not only are they damp and full of food.

How To Get Rid Of Drain Flies From Your Septic Tank?

If you have drain flies in your septic tank, then there are multiple things you can do to try and get rid of them! Remember, though; it’s not just about removing them from your septic tank. You’ll also need to remove them from every other area of your home as well!

While it’s often not a good idea to do too much with the septic tank in your home itself, you can treat the pipes in your home, as they’ll all lead to the septic tank anyway. And oftentimes, you’ll kill any drain flies that are trying to make their way out!

With that being said, here are a few ways to get rid of drain flies from your septic tank!

Drain fly in a macro shot

Pump The Tank

If you’re not pumping the septic tank regularly, then now is a great time to start! Any wastewater from your home will eventually exit a septic tank, but the waste itself can sometimes remain until the tank has been pumped.

Unfortunately, if you want to get your septic tank pumped, it’s probably going to need a professional.


At some point in time, you’ve probably had to use Drano in your home to remove a blockage. Because of this, you probably have a good idea of how powerful the stuff is. And that’s because one of the main ingredients in Drano is lye.

So if you want the drain flies gone fast, pouring Drano down the drain is a great way to get rid of them. However, you should be warned that Drano can only be left in your pipes for around 15-30 minutes. Anything longer than that, and the pipes could end up being damaged.

Hydrogen Peroxide

Hydrogen peroxide is another great choice for killing drain flies, especially ones that are living down your drain. In fact, the moment any drain flies comes into contact with hydrogen peroxide, it’s going to kill instantly.

And the best part is that hydrogen peroxide is also great for removing any buildups of detritus in your drains as well. So not only will you be eradicating drain flies from your home, but you’ll also be getting rid of their habitat as well, so drain flies won’t want to breed there!

Enzyme Cleaners

By far, one of the best ways to get rid of drain flies is with enzyme cleaners. Not only will enzyme cleaners destroy any drain worms, drain flies, and eggs, but they’re also going to eat away at any clogs in your drains as well.

Using an enzyme cleaner is actually one of the most effective methods on this list, and the best part is that they’re not harmful to the plumbing in your home either!

Try BioWonder

Lastly, another great way to treat your septic tank is with BioWonder. It’s an all-natural alternative, so you don’t have to worry about any damage happening to your septic tank or drain pipes when you use it, either!

To use BioWonder, you just need to mix 1 scoop with warm water and then pour it into your septic tank and drains. It will remove all the grime that drain flies feed on, as well as killing any drain flies it comes into contact with as well!

How To Prevent Drain Flies Coming To Your Home

If you want to prevent drain flies, you just need to make your home is so unappetizing to them that they won’t want to live there.

To do this, you should remove any standing water that builds up in your home. You should also frequently wash and flush any drain, making sure any buildup of muck is being removed.

As you can see, a lot of prevention is just keeping the forgotten areas of your home clean enough to prevent drain flies from coming back.

You should also look around your property for any areas drain flies may be living in secret as well. Here’s a great list of places to look when drain flies aren’t coming from your drain.

Are Drain Flies Good For Septic Tanks?

If you’re worried about drain flies in your septic tank, then the good news is they’re going to be completely harmless in your septic tank! In fact, they can actually keep the tank cleaner. When there are drain flies in the tank, they’ll end up feeding on all of the muck that may not get removed otherwise.

But just because they keep the septic tank cleaner doesn’t mean you should let them stay. Drain flies can spread bacteria from one area of your home to another, which could result in your family becoming sick!


As you can see, while drain flies in your septic tank can actually be useful, overall, it’s still best to get rid of them. The easiest way to do so is by pouring cleaners into your drains and toilets, as they’ll eventually reach your septic tank.

If you liked this article, make sure you check out the rest of the website! Otherwise, have a great day!

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