4 Ways to Adjust Water Level in Toilet Bowl

If the water in your toilet bowl is too high or too low, it is important to find out why and fix the problem. Fortunately, the causes and solutions are generally quite simple, and you probably won’t need to call a plumber – so here are 4 ways to adjust the water level in a toilet bowl.

If you want a few extra tips, you can check out this useful and sometimes amusing video too.

Too high or too low?

The correct way to adjust the water level in your toilet bowl depends on whether it is too high or too low. Let’s look at the different techniques for each situation in turn.

If the water level is too high…

adjust the water level in a toilet bowl

1. Unclogging pipes

With any kind of flushing toilet, if the water level in your toilet bowl is too high, the chances are that this is due to the pipes being clogged. When you flush your toilet, water can’t flow out as it should and so simply sits in the bowl.

Sometimes, the water level will gradually drop as the water flows out slowly – but with bad blockages, the water will remain in the bowl indefinitely.

Worse, if you continue to flush the toilet, the water will eventually overflow the bowl and toilet seat and end up all over your bathroom floor.

If you suspect this is the problem you are dealing with, there is a quick test you can do. Fill a bucket with water and pour it into the toilet bowl. If the water remains in the toilet bowl without flowing out, it is safe to assume you have a blockage.

To resolve the problem, you can first try putting on a pair of rubber gloves and reaching into the toilet bowl to see if there are any larger items like diapers or tampons blocking the toilet.

If you don’t find anything, the blockage may be further down the pipe, so the next step is to try unblocking it with a plunger.

If the plunger doesn’t do the job, you may consider pouring boiling water into your toilet or using chemical products to unblock it – and if none of these techniques works, it may be time to call in a professional.

If the water level is too low…

How to adjust the water level in a toilet bowl

2. Adjusting the water level in the tank

If the water level in your toilet bowl is too low, there are several possibilities, but the most common reason will be related to what’s going on inside your toilet’s tank, so this is what you should check first.

Start by removing the tank lid and setting it aside and check the level of the water in the tank. It should be about an inch below the level of the fill valve and overflow tube, and if it is significantly lower than this, you will need to adjust the water level in the tank.

There are several variations on toilet tank mechanisms, but most use a float – either in the form of a ball or a cylinder – to control the level of the water

Whichever type you have, the first step is to turn off the water supply to the toilet. Find the external water valve and close it, then flush the toilet to remove all water from the tank. If the valve is closed correctly, the tank won’t refill again.

If you have a ball version, check that it isn’t damaged. If it is damaged or there is water inside the ball, it will need to be replaced.

If everything looks to be in working order, simply adjust the height of the ball as necessary – there should be a screw that allows you to do this.

Once you have made the necessary adjustments, turn the valve back on, allow the tank to fill, flush the toilet and check to see if the water level is now where it should be.

With a cylinder version, the process is almost identical. To adjust the height of a cylinder float, there should be a screw that you turn to move it up or down. When you have adjusted as necessary, fill the tank and flush to test.

3. Clear the plumbing vents

If the problem doesn’t come from the tank, there could be an issue with the plumbing vents in your home.

In a properly-functioning plumbing system, vents allow air in to maintain the correct pressure. If the vents become blocked, air can’t enter, and the water won’t flow properly.

The concept is the same as the old college trick of inserting a straw into a beer bottle when trying to drink it as quickly as possible. The straw allows air to enter the bottle, letting the beer flow out in only a few seconds.

The tell-tale sign that suggests you might have blocked vents is that your toilet gurgles and splutters when you flush another toilet in your home or empty the bathtub.

If this happens, you might try climbing onto your roof and flushing your pipes out with water from a garden hose.

If this is a recurring problem in your home – perhaps due to falling leaves – it might be worth considering investing in some kind of cover for your vents to prevent leaves or other detritus from blocking them again in the future.

4. Cracked toilet

If you can’t find any other reasons for the low water level in your toilet bowl, check for hairline cracks. If you find the water level drops gradually after each flush, this is a sign that you might be dealing with a leak of some kind.

Another giveaway is if you find puddles of water on the floor – although the leak or crack could be below the floor level, so puddles of water won’t always be visible.

If your toilet is cracked or you have any other kind of leak, it is important to fix it as quickly as possible since this can lead to serious structural damage in your home that will be expensive to repair later if you don’t catch it in time.

With this kind of problem, you may find your only option is to replace the whole toilet.

Resolve the problem quickly

As with most plumbing issues, the key is identifying the cause early and taking action. If you put the repairs off until later, the problem will only get worse – and you may find you need to spend a lot more money fixing it than if you had taken action when you first noticed the issue.

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