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How To Adjust Water Level in Toilet

Sep 16, 2021 | Plumbing Guides

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The water level in your toilet is important. If the water level is wrong, then you may find yourself encountering some problems later down the line.

If you want to avoid having problems, then, it’s better that you know how to adjust the water level in your toilet. This means that your toilet will be able to flush efficiently, after all!

Unfortunately, we aren’t all born with an innate knowledge of how to adjust the water level in a toilet. Thankfully, we know a thing or two about how you can adjust the water level in a toilet!

Read on for our guide!

Why Should I Adjust the Water Level in My Toilet?

Okay, so your first question may be why you should actually bother with adjusting the water level in the first place. Nobody wants to unnecessarily play around with their toilet, after all!

As it turns out, the water level in your toilet bowl is rather important. For instance, if the water level isn’t high enough then you may find that there’s not enough water for you to flush it correctly.

That can be rather embarrassing, and it may mean that you’re constantly needing to unclog your toilet.

If your water level is excessively high then it means that you’re wasting a lot of water, and your toilet may even end up overflowing. You can avoid both of these situations if you just adjust the water level in your toilet to an acceptable level.

Adjusting the Water Level

There isn’t necessarily one specific way to adjust the water level in your toilet. As it turns out, the way that you adjust the water level depends on whether the water level is too high or too low.

Too High?

So, how do you lower the water level if it’s too high? There are a few different ways that you can lower the water level.

Unclog the Pipes

The first thing that you can do to lower the water level is unclog the pipes in the toilet. First, it’s best to check if clogged pipes are causing the problem. Grab a bucket and fill it up with water.

Then, pour that water into your toilet bowl. If the water doesn’t start to flow out of the toilet, then there’s a strong chance that your pipes are clogged.

If your toilet is blocked, then it’s fairly easy to fix. Grab a pair of rubber gloves to protect your hands, then reach into the bowl. There’s a chance that there may be some large items that are blocking the toilet, stopping it from working.

If this is the case, pull the items out and see if it flushes again. In some circumstances, it may be that the problem is further down the pipe, in which case you may need to use a plunger to deal with the blockage.

Pouring boiling water into the bowl can also help. If nothing works though, it’s best to call a plumber in to fix the problem. It’s better not to mess around with complicated plumbing issues unless you know what you’re doing.

Too Low?

Adjusting Water Levels

In some cases, the problem may be that the water level is simply too low. There are a few different reasons why the water level could be too low – first though, you should look at the tank.

To look at the tank, remove the lid and put it to one side. You should see the water level here – ideally, it needs to be roughly one inch below the fill valve level and the overflow tube. Any lower and you will need to alter the water level.

To alter the water level, you first need to turn the water supply to the toilet off. Then, flush the toilet to get rid of any water in the tank once you have closed the external water valve.

This is important, as it will allow you to check if it has been closed properly. If done correctly, the tank is not going to refill with water again.

If you have a ball tank then you should check if the ball is damaged – if so, you will need to replace it. If it’s fine then all you need to do is alter the ball’s height. It’s a similar process with the cylinder version – you just need to turn a screw.

Once you have altered the water level, all you need to do is put the valve on again. Then. let the tank fill up and flush. You should then see if the water level is where it needs to be.

Plumbing Vents

Sometimes the issue may not be with the tank, in which case you need to make sure that the plumbing vents are all clear. Your toilet may splutter or gurgle if you empty the bath or flush another toilet if it’s an issue with the vents.

You can solve this fairly easily by flushing the pipes using a garden hose. In some situations, you may need to get a professional plumber to unclog the vents.

Toilet Issues

Finally, if none of these issues seem to be the case for your toilet, then the toilet may be cracked. Even a hairline crack can make a huge difference and can drain your toilet of water.

You will need to fix the toilet immediately if this is the case, otherwise you may risk causing structural damages to your home.


Adjusting the water level in your toilet is sometimes a necessary task if your toilet isn’t working the way that it should. In these situations, you will be pleased to know that the process is simple!

Just diagnose the problem, then follow the steps mentioned above to solve your toilet issues. If you have any concerns, don’t hesitate to speak to a professional for further advice.

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