Getting a house for your family is not easy, but once you get it, then you may face the biggest challenge of maintaining it. There is a problem that so many house owners keep facing is that the upstairs bathroom sink keeps filling up with water.
It looks odd once you see it, moreover, regular household works become quite a difficult thing to do in such a situation.
Hence, this blog post is to guide you in dealing with such an unpleasing situation. I have my own experience with it, and I have also done some research to help you with some more insights.
Reasons For Filling Up With Water The Upstairs Sink
If you see an incident keeps on happening to a good number of people, then there must be some reasons that are leading to that outcome. Similarly, there are a few reasons that is creating this issue, in the home for a long time.
Without any further ado, let’s get to know about all those reasons.
- Jammed By Waste Disposal

While containing waste disposal in your house, any issue with the drain plug might be sending the water to the upper part of the sink.
In the garbage disposal, there comes a drain plug to connect to the dishwasher, and it needs to be removed before the installation of the garbage disposal.
Without doing this, there might be a water backup scenario.
- Getting The Sink Clogged
Due to the regular usage of the sink, it often gets clogged. It happens mostly when something gets stuck in the water flowing line of the sink during any type of work.
- Fault In The Plumber Job
How the installation job of the sink is done depends a lot on the experience of the plumber. If the plumber fails to do his job perfectly, then it may cause the filling up of water for the upstairs sink.
- Blockage In The Line Of The Sink
When you see most of the common reasons are absent, then you can assume that there must be a blockage farther down the line in the sink.
It may be too far to reach for you even with a sink cleaner, so in such a case, you may have to call a professional.
- Stuck Water In The Dishwasher
Sometimes, due to the connection with the sink, the water from your dishwasher may flow from the same drain from which the sink water may fall. So, when there is any blockage in the dishwasher, then the water may start filling up in the upstairs sink.
- Leaking Faucet
When your faucet is constantly leaking water, then it could be causing the sink to fill up with water.
- High Water Pressure
The higher pressure of the water in your home may also cause water to back up in your sink. So, you need to keep it in check occasionally.
How To Fix The Constant Filling Up With Water For The Upstairs Sink?
As you know about all the prominent causes behind the constant filling up with water for the upstairs sink, so it is time to know about how to fix all those reasons to avoid the problem entirely. I am sure you will find it beneficial for yourself.
- Conscious Waste Disposal

You will have to be very conscious while disposing of the waste.
Remove the dishwasher from the waste disposal for any further complications.
This is a very straightforward process for which you may not need any professional help.
But you can always seek it if you think it is essential.
- Regular Cleaning Of The Sink
A sink is a place that is exposed to so many things that can get stuck in the line where the water is supposed to flow. So, to keep that path interrupted you need to make sure the sink is clean, you can use sink cleaner for that.
- Ensuring Professional Work
To avoid any further issues, you can look for getting the best quality professional plumber service for your home. It may cost you a bit more, but it will be beneficial for you in the long run.
- Identify Any Blockage And Remove It
In the sink water flowing line if you find out any blockage then without any delay, you need to work on unblocking. This way the water will keep flowing without much interruption. This video should help!
- Monitoring The Sink After Any Task
When you do any job, after finishing it, clean the sink. While doing so, try to monitor the sink and the water drainage system entirely to find out any existing issues to solve them sooner.
- Removal Of Any Leakage
If there is any leakage in the faucet or the source of the water, then try to solve it as soon as you figure it out.
- Checking The Water Pressure Level
There might be some fluctuation in the water pressure level that you need to keep checking on. It needs to remain at the optimum level to not fill up with water for the upstairs sink.
These are some ways of fixing the constant filling up with water of the upstairs sink issue.
Frequently Asked Questions (FAQ)
There are so many reasons that might be causing this issue. However, among all of those reasons, clogging in the sink is one of the most common reasons. To solve that problem, you can use sink cleaner and snakes in the drain of the sink to unclog it.
If you find a blockage in the second sink, then chances are there might be a blockage in the garbage disposal or main drain of the sinks.
There are many ways of stopping the sink from filling up with water, the most common one is unclogging the drainage with sink cleaner or snakes.
There must be some elements like hair, dirt, grease, and food stuck in the drainage system of the sink. It keeps accumulating there over time. So, keep checking on the drainage system of your sink often.
Final Words
It’s not uncommon for an upstairs bathroom sink to keep filling up with water. Unfortunately, this can be caused by a variety of issues.
Common reasons why an upstairs bathroom sink may be filling up with water include clogged drains, leaking pipes, and so on. To determine the exact cause of why your upstairs bathroom sink keeps filling up with water, it is important to contact a plumber or handyman as soon as possible.
This way, you can prevent any further damage and repair the issue quickly and efficiently.