How to Repair a Leaking Toilet Base Seal

Water pooling around the base of your toilet is more than an annoyance; it is a signal that your wax ring has failed. Over time, house settling or a loose toilet base can break the seal, allowing sewer gases and waste water to seep onto your bathroom floor. Ignoring this will inevitably lead to rot in your subfloor, so fixing it immediately is the only way to avoid a much larger restoration project. Successfully resealing a toilet is a straightforward task that relies on precision and a clean workspace. You do not need a plumber to handle this, provided you are willing to lift the toilet and scrape away the old material thoroughly. When done well, the toilet will be rock-solid, flush cleanly, and remain completely dry at the base.

  1. Drain the Tank First. Turn off the water supply valve located behind the toilet and flush the tank to remove as much water as possible. Use a sponge or small cup to bail out any remaining water from the tank and the bowl trap.
  2. Lift Clear of the Bolts. Remove the decorative bolt caps and unscrew the nuts from the flange bolts using an adjustable wrench. Carefully rock the toilet side-to-side to break the seal and lift it straight up off the bolts.
  3. Scrape the Flange Clean. Use a putty knife to scrape away every trace of the old wax ring from the flange and the horn on the underside of the toilet. Clean the area until the surface is smooth and free of debris.
  4. Check Flange Integrity. Check the floor flange for cracks, corrosion, or movement. If the flange is damaged or sits too low, install a flange extender or a repair kit before proceeding.
  5. Align and Lower Carefully. Place the new wax ring onto the flange or the toilet horn. Lower the toilet straight down onto the flange bolts, ensuring you align it correctly on the first attempt to avoid smearing the wax.
  6. Bolt Down and Caulk. Tighten the nuts onto the flange bolts by hand, then use a wrench to give them a final snug turn. Apply a thin bead of silicone caulk around the base to provide extra stability and prevent moisture from getting under the porcelain.