Why my sink fills up whenever I run the dishwasher and how to unclog it?

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This is not the worst experience of plumbing. When you see your sink full of water, it is a painful experience for you if it comes from a Dishwasher. Most of the time, it comes again and again, but it also goes away very easily, and if you take care of it a little bit, it will be fine.

Sink and Dishwasher Maintenance 101

One thing to keep in mind whenever you start to fix or clean up plumbing issues: First, unplug your electronic appliances, Such as dishwashers, Garbage Disposal, etc. Doing so will save you from the loss of life or appliance and stop water flow, whether cold or hot.

It is also important to know that there is a lot of water in your kitchen sink and dishwasher going through the same line. So if the water stops flowing from the main drain line, the water will return to the kitchen sink or an overflow. These Obstacles are found in almost four places, such as dishwasher, garbage disposal, air gap, and the kitchen sink. The simple thing is that if any one of these four places will be blocked, it can cause the sink to overflow.

Obstructed Dishwasher

There is no need to worry if there is a little water at the bottom of your dishwasher. But if the water completely covers the bottom of your dishwasher, it is a direct indication that the water is not going down the drain. You must see that there is no obstruction in the drain of the dishwasher, and you should also see that there is no obstacle in the drain hose because it also causes problems. Always remember to use a good Detergent brand and add the right detergent amount because it also obstructs the drain.

Jammed Garbage Disposal

The second problem is with the garbage disposal plug because the plug closes the hole that connects the Garbage Disposal and Dishwasher, and if the hole is closed, the water will not flow from your sink dishwasher properly. This usually happens when you have installed new garbage disposal. Remove the plug from Garbage Disposal to resolve this issue.

Clogged Sink

It is also possible that there is an obstruction in your sink, so it does not allow the dishwasher to drain the water. There are three ways to solve this problem.

  1. I always advise you to run Garbage Disposal for a few seconds before running a Dishwasher. So that whatever food or debris is in it is removed.
  2. Use a good cleaner to remove debris or blockage from your sink drain, which is according to your brand, doing so will not cause any drainage, and no bacteria will remain.
  3. If Garbage Disposal and Sink Cleaners are not working, buy the sink snake from any local hardware store because it will help you clean your drain issues.

Even after doing all this, the problems are still not being solved, so I suggest contacting the local plumber.

Blocked Air Gap

If there is an air gap in your kitchen sink, there may be an obstacle in the air gap, and because of this, the water of the dishwasher is filling in the sink. It is usually placed on the upper faucet side of your sink and removes the backflow. If water is flowing from the air gap, there must be an obstacle, and steps are needed to clean or correct it.

  1. Take off the cap of the air gap.
  2. Also, unscrew the inside cap.
  3. Sometimes the debris is seen in front of you, and you have to remove it, but sometimes there is too much obstruction, and it is not visible.
  4. If the clogged is not visible, then take a twelve-inch bottle brush that you can get from any store.
  5. Now the last task is to remove all the debris from the air gap using a bottle brush.


You know how much time these issues go to waste, so now I will give you some tips that will not cause any problems.

  • Don’t treat your garbage disposal and sink like a garbage can.
  • Don’t put everything in your sink like rice, bones, pasta, peals, etc.
  • Use any good cleaner from time to time.

It is hoped that following these tips will help you avoid future blockages that cause the sink to overflow and much more.

Can I install an air gap under the counter?

The air gap must be placed above the dishwasher so that it can function properly. If you put an air gap under the sink, it is more likely that the sink’s bottom will be filled with water. If there is any obstruction in the drain, the water will overflow and spring from the air gap, and falling on your cabinet will ruin the floorboards.

Here are some tips that will help you to unclog your sink and dishwasher easily

This is for those who want to learn how to eliminate sink drain issues. There are many ways to overcome this obstacle, but we will tell you the four best ways that allow you to open your sink groove easily. There is a slight change to eliminate the bathroom and sink drain issues. Here are some steps you can take to begin the process of cleaning the sink drain.

Plunger Method

The method is very simple and straightforward, and using it opens blockage of the kitchen sink drain. Just use it for a few minutes, and after a while, it will remove the garbage. You can solve this problem by buying a small plunger from anywhere.

Baking Soda With Vinegar Method

This method is a bit complicated. First, you have to remove all the water that is under the sink. You can put this water in a bucket or a container. Continue to remove the dirty water until you reached the drain. Follow these steps when you reach the drain.

  1. Take a cup of baking soda and put it in the drain.
  2. Take a spoon or something long and push it down.
  3. Now put a cup of vinegar in the sink and close the drain with a sink stopper so that the baking soda and vinegar could not come out.

After following these steps, I am sure that the sink will open. Because when baking soda and vinegar are mixed, then a chemical reaction is formed, which removes all the obstructions in the water pipes, and none of your pipes are damaged.

Drain Snake Method (Metal Wire)

This method may take some time, depending on where the barrier is. For this method, you will need a drain snake. It is made of metal wire and has a hook at the end. This hook is for inserting into the pipe. When you insert it into the pipe, trash will get stuck in the hook, whatever will be in the sink’s drain. You may need a little more plumbing tools.

When the garbage gets stuck in the drain snake and takes the snake out of the Drain, then the drain of the kitchen sink will open. As you know, garbage can get into any part of the pipe, so you can also remove the pipes with tools’ help. Be sure to use any bucket to remove the water.

Disposal Suction Method

If you’re trying to figure out how to clean a kitchen sink drain in which there is disposal, this is a perfect recipe that will work quickly. If both sides of your sink are filled with water, block the sink drain without disposal. Pulling the plug down will make it tighter. Now pour boiled water in the sink and run the disposal with the plug. By doing this, the disposal will work like a vacuum and will remove all the obstructions from the drain by itself. It’s the easiest way to clean the drain.

Unclog an Obstruction in Your Dishwasher

The dishwasher pours out hot water in his last cycle. It is easy to find out how hot the water is under the dishwasher when the cycle is complete. If both cold and hot water is on the drain simultaneously, that is not fine. There are several ways in which you can clear your dishwasher drain.

Check the Sink

Dishwasher runs through sink disposal. If there is any obstruction in the sink or disposal drain, the water will not flow properly. Before you do anything, make sure there is no obstruction in the sink drain.

If water has flowed back from your sink, water may also come from your dishwasher. Most are connected. If any of them are blocked so the other one will be blocked too because of this. It is also possible that there is a pipeline problem.

Check for a Blocked Air Gap

Often, an air gap is found at the top of the sink. It is a small piece of chrome that sticks out. Pick it up and see if the air gap is blocked by debris. Due to the obstruction in the air gap, the water of the dishwasher also comes back.

Check the Drain

If you remove the bottom rack, you will see the drain. Now you have to see if there is any obstruction in the drain. If there is an obstacle, remove it and fix it, and if it looks obvious, you have to check the drain hose. Maybe there is an obstacle inside it. Insert the water pressure into the hose to check it, then see if the water has flown back or not.


The blockage of the sink drain is a widespread problem. If you don’t want this to happen repeatedly, so do not put your food, hair, peels, etc., in the drain. Doing this greatly reduces these issues. As I told you, there are many ways to solve this, but if it is still not resolved so contact a plumber. I hope now you can solve any obstruction of the sink drain.

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Ubaid Hassan
Ubaid Hassan

Introducing Ubaid Hassan – the expert who knows all about fixing dishwashers. Ubaid understands how dishwashers work and is really good at finding and solving problems. Ubaid is the person to ask for helpful advice and solutions. Loving both dishwashers and taking care of the environment, Ubaid can share smart ideas to help you use your dishwasher well and be kind to nature.

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