Can You Fix A Cracked Toilet?

Many problems can occur to a homeowner with a cracked toilet. There are many questions to consider when this happens. You must decide whether it is cosmetic or dangerous damage, and it matters where the crack is located. You may need to replace the unit. Here are a few tips of what cracks can be repaired and which ones cannot.

Identify the Problem

You must find the location of the crack and identify the type and size on different parts of the toilet before you make a decision. If the crack is inside of the tank and over 1/16 inches wide, you would be better to replace the tank. A hairline/shallow crack on the outside of the tank could be repaired with plumbing epoxy if it is for cosmetic reasons. However, if a crack is on the inside of the bowl, you will probably need to replace the tank.


  • Use a caulking gun to apply epoxy to the cracks.
  • Plumbing epoxy is waterproof and used to patch and seal small cracks in the toilet.
  • Use towels, cloths, and sponges to completely dry the entire toilet before you apply epoxy.
  • You will need an adjustable crescent wrench to disconnect the toilet's water supply.
  • A putty knife is used to spread the epoxy.

Preparation Steps

  1. Disconnect the water supply leading to the tank before you drain the toilet bowl.
  2. Use the shutoff valve beside or behind the toilet to turn off the water.
  3. Flush the toilet and allow it to drain completely.
  4. Use the wrench to disconnect the water supply line from the tank.
  5. Use sponges and towels to dry the water both inside and outside of the tank. You could use a hair dryer to save time to be sure the tank is completely dry.
  6. Apply the epoxy one inch before the crack starts, continuing to approximately one inch after it ends.
  7. Use the putty knife to spread the epoxy over the entire area around the crack.
  8. Wait 24 hours before you add water to the tank.


Be careful when removing the lid to the tank because it is very heavy. Use both hands and lift it off the tank and place it on a padded surface such as a folded towel.

Using this guideline, you should have a tank that will not leak. If you still have a leak, it may be time to call a professional or replace the entire tank. A professional plumber can also offer you a guarantee that DIY work doesn't provide. If you have a bad leak, consider calling a 24-hour emergency plumber