How To Fix A Wobbly Toilet Tank

How To Fix A Wobbly Toilet Tank

A wobbly toilet tank can be a nuisance and cause a constant rocking sensation while using the toilet. This can be attributed to several reasons such as loose mounting bolts, worn-out gaskets, and a cracked tank. Ignoring the problem can lead to a leaky toilet or even worse, a cracked tank that can result in water damage to your bathroom. To avoid these issues, it’s best to fix a wobbly toilet tank as soon as possible. In this article, we’ll guide you through the process of fixing a wobbly toilet tank.

Tools Required

Before you begin the repair process, ensure you have the following tools ready:

  • Adjustable wrenches
  • Screwdriver
  • Gasket
  • New bolts and nuts
  • Silicone caulk

Step 1: Turn off Water Supply and Drain Toilet Tank

The first step in fixing a wobbly toilet tank is to turn off the water supply and drain the toilet tank. Locate the water valve near the base of the toilet and turn it off. Then, flush the toilet to drain the tank completely. Next, sponge out any remaining water from the tank and bowl.

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Step 2: Remove Toilet Tank Lid and Mounting Bolts

Once you’ve drained all the water from the toilet tank, remove the lid by unscrewing the bolts that attach it to the tank. To remove the mounting bolts, use an adjustable wrench to unscrew the nut that holds the bolt in place. Keep the bolt and nut in a safe place as you’ll need them later.

Step 3: Remove Old Gaskets

The next step is to remove the old gaskets that seal the tank onto the bowl. Lift the tank gently and remove the old gaskets placed between the tank and the bowl. If the gaskets are worn out, torn, or cracked, it’s best to replace them with a new one.

Step 4: Install New Gaskets and Mounting Bolts

With the old gaskets removed, install new gaskets onto the base of the tank, making sure they’re lined up and seated properly. Position the tank back onto the bowl, aligning the mounting holes with those on the bowl. Secure the tank in place by inserting the mounting bolts through the holes and hand-tightening the nuts onto the bolts. Be careful not to overtighten as it may cause damage to the tank or bowl.

Step 5: Level the Toilet Tank

Now that you’ve secured the toilet tank, check if it is level. Use a level to check if the tank is sitting straight on the bowl. If it’s not level, adjust the tank by tightening or loosening the mounting bolts until it sits level.

Step 6: Reattach Toilet Tank Lid

Finally, reattach the toilet tank lid by screwing in the bolts back into their respective holes. Tighten the nut until they’re snug but not too tight as it may cause damage to the lid.

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Step 7: Turn On Water Supply and Test

Before you use the toilet, turn on the water supply and fill the toilet tank. Check for leaks, and if everything looks good, flush the toilet to ensure it’s working correctly.


Q: Why is my toilet tank wobbling?

A: A wobbling toilet tank can be attributed to several reasons such as loose mounting bolts, worn-out gaskets, and a cracked tank.

Q: Can I fix a wobbling toilet tank myself?

A: Yes, you can fix a wobbling toilet tank yourself by following the steps mentioned above.

Q: How much does it cost to fix a wobbly toilet tank?

A: The cost to fix a wobbly toilet tank depends on the reason for wobbling and the extent of the damage. It could range from a few dollars for replacing gaskets to a few hundred dollars if the tank needs to be replaced.

Q: What should I do if I notice water leaking from the toilet?

A: If you notice water leaking from the toilet, turn off the water supply and call a plumber to fix the issue.

Q: How often should I check my toilet for wobbling?

A: It’s a good practice to check your toilet for wobbling at least once every six months.


Fixing a wobbly toilet tank might seem daunting, but it’s a simple process that anyone can do. It’s essential to address the issue early on to avoid further damage to your toilet and bathroom. Follow the steps mentioned above, and you’ll be able to fix the wobbly toilet tank with ease. Remember to check for leaks before and after the repair to ensure everything is working correctly. If you’re unsure or can’t fix the issue yourself, call a professional plumber.

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