How to Fix a Toilet Leaking From Its Tank Bolts

toilet leaking from tank bolts

The toilet is one of the most underrated components of the home. Sure, toilets aren’t glamorous, but life without modern-day plumbing would be very, very different (and not in a good way!).

The thing about toilets is that they tend to be out of sight and out of mind, until something goes wrong. One of the most common things that go wrong with a toilet is leaking water from the tank bolts. Since no one wants to deal with water where it shouldn’t be in their home, you’ll want to address this issue sooner rather than later. Luckily, this project is relatively simple with a few minutes of your time and a little plumbing know-how.

Our easy, step-by-step guide will walk you through how to fix a toilet that’s leaking from its tank bolts.

How to Replace the Toilet Tank Bolts in 11 Steps


  • Brass screws
  • Rubber gasket
  • 2 flat washers
  • 2 metal nuts
  • Pliers
  • Screwdriver
  • Wrench
  • Sponge


Step 1. Turn off the water supply. The valve is located directly behind the bottom of the toilet bowl. If the valve is stubborn, you may need the help of a trusty pair of pliers.

Step 2. Flush the toilet to empty the water from the tank. You may need to do this more than once to get all of the water out. We recommend using a sponge to soak up any water that isn’t removed by flushing.

Step 3. Remove the caps from the nuts then remove the nuts. Again, grab those pliers if the nuts are stubborn!

Step 4. Disconnect the water supply line. This is a narrow pipe located behind the toilet. Rotate the nut that holds it in place counterclockwise.

Step 5. Gently lift and remove the toilet tank.

Step 6. Replace the bolts with new ones. The bolts are located on the bottom of the toilet tank. Tighten the new bolts gently so you don’t crack the tank!

Step 7. Replace the gasket. Place the new gasket over the drain valve located on the bottom of the toilet tank.

Step 8. Return the toilet tank. Gently place the toilet tank in its original position. Tighten both the flat washers and the metal nuts on top of each bolt.

Step 9. Inspect the toilet tank. Is the toilet tank touching the toilet seat? If they aren’t making contact you’ll need to tighten the flat washers and nuts more.

Step 10. Turn the water supply back on and allow the toilet tank to fill with water.

Step 11. Once the toilet tank is full, flush the toilet to check for proper function.

Toilet Repair and Plumbing Services in Clearwater, Florida

Sometimes it’s easier to leave the plumbing projects to the pros. When you’re in need of plumbing repair or installation services, Climate Design is here to help. We offer an array of quality plumbing services to the Clearwater area and beyond. Contact us today for more information or to schedule an appointment.

Call (888) 572-7245 to Schedule Your Appointment