A leaking toilet tank can cause water damage, increase water bills, and compromise the efficiency of your bathroom. One common cause of toilet tank leaks is faulty tank bolts. If you’ve noticed water pooling around the base of your toilet, it’s crucial to address the issue promptly to prevent further damage.

We will provide a step-by-step guide on how to fix leaking toilet tank bolts, allowing you to restore the functionality of your toilet and eliminate wasteful leaks.

Understanding the Problem:

Toilet tank leaking bolts occur when the bolts securing the tank to the bowl are loose, damaged, or improperly sealed. This can lead to water leakage, resulting in a damp bathroom floor and potential water damage. Fixing this problem requires simple adjustments and replacements to restore a tight and watertight seal.

Step-by-Step Guide to Fixing Leaking Toilet Tank Bolts:

  1. Turn off the Water Supply: Before starting any repairs, locate the water supply valve near the base of the toilet and turn it off to prevent water flow.
  2. Drain the Tank: Flush the toilet to drain the water from the tank. Use a sponge or towel to soak up any remaining water in the tank and bowl.
  3. Remove the Tank Lid: Carefully lift the lid off the tank and set it aside in a safe place.
  4. Inspect the Bolts and Washers: Locate the tank bolts at the bottom of the tank, securing it to the bowl. Inspect the bolts and accompanying washers for any signs of damage or wear.
  5. Tighten the Bolts: Using a wrench, tighten the bolts evenly. Start with a gentle tightening motion and gradually increase the pressure until the bolts are secure. Be cautious not to overtighten and risk damaging the toilet or the wax seal.
  6. Replace Damaged Washers: If the washers accompanying the tank bolts are worn out, cracked, or damaged, it’s advisable to replace them. Remove the old washers and replace them with new ones of the appropriate size.
  7. Check the Rubber Gasket: The rubber gasket between the tank and the bowl helps create a watertight seal. Inspect the gasket for any signs of damage or wear. If necessary, replace the gasket with a new one.
  8. Reassemble the Toilet: Carefully place the tank back onto the bowl, aligning the bolt holes. Ensure that the tank is level and the gasket is properly seated. Insert the bolts through the holes and tighten them evenly.
  9. Test for Leaks: Turn on the water supply and allow the tank to fill. Observe the area around the bolts and the base of the toilet for any signs of leaks. If leaks persist, ensure that the bolts are properly tightened or consider seeking professional assistance.
  10. Reinstall the Tank Lid: Once you have confirmed that there are no leaks, reattach the tank lid securely.


Fixing leaking toilet tank bolts is a relatively simple task that can be accomplished with basic tools and a systematic approach. By following the step-by-step guide outlined in this article, you can address the issue effectively and restore the functionality of your toilet.

Regular maintenance, including checking the tightness of the tank bolts and inspecting the washers and gaskets, can prevent future leaks and water damage. Remember to exercise caution during the tightening process to avoid damaging the toilet or the wax seal.

With a properly sealed and secure toilet tank, you can enjoy a leak-free bathroom and conserve water for a more sustainable household.