A wax ring creates a watertight seal between your toilet and the drain opening in the floor

The wax ring is a ring of wax (usually mixed with petroleum jelly for flexibility) that sits between the base of your toilet and the flange—the metal or plastic ring bolted to the floor that connects to your drain. When you set a toilet down, your weight compresses the wax into a seal that stops water and sewer gas from leaking into your home.

Over time, wax rings harden and crack. If you notice water pooling under the toilet, smell sewer gas in the bathroom, or see staining on the ceiling below, the wax ring has likely failed. Replacing it means removing the toilet, scraping out the old wax, and installing a new ring before resetting the toilet.

This is a job you can do yourself if you are comfortable with basic plumbing work. It takes two to four hours, requires no special tools beyond what most households have, and costs between $10 and $30 for the wax ring itself. If you are not confident removing and resetting a heavy toilet, or if you find damage to the flange or floor underneath, call a plumber.

Key Takeaways

  • A failed wax ring shows itself through water pooling at the toilet base, sewer odors, or water stains on the ceiling below.
  • You will need to turn off the water, flush to empty the bowl, disconnect the supply line, unbolt the toilet from the floor, and lift it away to access the old wax ring.
  • Scrape the flange clean down to bare metal or plastic, then center a new wax ring on the flange before resetting the toilet.
  • Reinstall the bolts, reconnect the water supply, and run water to check for leaks before calling the job complete.
  • If the flange is cracked, the floor is soft or rotted, or the toilet does not sit level after resetting, stop and call a plumber.

Turn off the water and empty the bowl

Locate the shutoff valve behind or to the side of the toilet, usually a small knob or lever on the water line. Turn it clockwise (or flip the lever) until it stops. Flush the toilet to drain the bowl and tank. If water continues to run, the valve may be stuck or faulty—turn it as far as it will go and proceed, but be ready for water to spill when you disconnect the supply line.

If the shutoff valve will not close, you can still do this job, but you will need to work faster and have towels ready. Some older homes have the main shutoff valve in the basement or crawlspace instead of at the toilet; if you cannot find a valve at the toilet, that is where to look.

Disconnect the water supply and unbolt the toilet

Use an adjustable wrench or pliers to loosen the nut where the supply line connects to the fill valve (the inlet at the bottom of the tank). Turn counterclockwise until the nut is loose enough to unscrew by hand. Water may drip—have a towel ready. Unscrew the nut the rest of the way and pull the supply line free.

Look at the base of the toilet where it meets the floor. You will see two bolts (usually brass or stainless steel) on either side, often covered by plastic caps. Pry off the caps with a flathead screwdriver. Use an adjustable wrench to loosen the nuts on both bolts, turning counterclockwise. Once loose, unscrew them by hand and set them aside in a safe place—you will reuse them.

Lift the toilet and remove the old wax ring

Rock the toilet gently side to side to break the seal between the wax ring and the flange. Once it moves freely, grip the bowl on both sides (not the tank) and lift straight up. The toilet is heavy—usually 80 to 100 pounds—so use your legs and get help if you need it. Set the toilet on its side on a towel or cardboard to protect the floor and keep water from spilling out of the trap.

You will now see the old wax ring stuck to the flange. Use a putty knife or old chisel to scrape it away. Work slowly and scrape down to bare metal or plastic—any wax left behind will prevent a good seal with the new ring. Scrape the underside of the toilet's horn (the outlet that sits in the flange) as well. Wipe the flange clean with a dry cloth.

While the toilet is up, inspect the flange for cracks or damage and check the floor around it. If the flange is cracked, the floor is soft or spongy, or you see rot, stop here and call a plumber. Resetting the toilet on a damaged flange or weak floor will fail again quickly.

Install the new wax ring and reset the toilet

Remove the new wax ring from its packaging. Most come as a straightforward ring; some have a plastic or rubber sleeve around the outside. Center the wax ring on the flange, pressing it down gently so it stays in place. Do not compress it hard—you want it to sit on the flange, not squeeze into the drain opening.

Carefully lift the toilet and lower it straight down over the flange, aligning the bolts on either side with the bolt holes. Lower it slowly and evenly. You should feel resistance as the toilet's weight compresses the wax ring. Stop when the toilet sits flat on the floor. Do not rock it side to side or try to force it down—if it does not sit level, lift it and check that the wax ring is centered and the flange is clear of debris.

Once the toilet is seated, reinstall the bolts through the holes at the base and thread the nuts on by hand. Use the wrench to tighten them, but do not over-tighten—snug is enough. Over-tightening can crack the porcelain. Snap the plastic caps back over the bolt heads.

Reconnect the water supply and test for leaks

Screw the supply line nut back onto the fill valve by hand, then use the wrench to tighten it a quarter turn more. Do not over-tighten. Turn the shutoff valve counterclockwise to restore water flow. The tank will fill. Once it stops, flush the toilet and watch for leaks around the base and under the tank where the supply line connects.

Let the toilet sit for a few minutes, then check again. If you see water pooling at the base, the wax ring may not have sealed—this usually means it was not centered or the flange was not clean. You will need to turn off the water, disconnect the supply line, unbolt the toilet, and try again with a new wax ring. If the leak is at the supply line connection, tighten that nut a bit more.

When to call a plumber instead

Stop and call a plumber if the flange is cracked or broken, if the floor around the toilet is soft, spongy, or shows signs of rot, or if the toilet does not sit level no matter how you adjust it. These are signs of damage that goes beyond the wax ring and needs professional repair.

Also call a plumber if you are not comfortable lifting a heavy toilet, if the old bolts are corroded and will not come free, or if you turn the shutoff valve and water continues to run—a stuck valve can make the job messy and may need replacement. There is no shame in handing this off; a plumber can do it in an hour and may provide the seal.

Frequently Asked Questions

Can I reuse the old wax ring?

No. Once a wax ring has been compressed and exposed to air, it hardens and loses its seal. Always install a new ring. They cost $10 to $30 and are not worth the risk of another leak.

What if water leaks from under the toilet after I reset it?

Turn off the water, disconnect the supply line, unbolt the toilet, and lift it again. Check that the flange is clean and the new wax ring is centered. If the ring looks compressed unevenly or the flange has debris, scrape it clean and try again with a fresh wax ring.

Do I need a wax ring with a plastic sleeve?

Standard wax rings work fine for most homes. Rings with a plastic or rubber sleeve are optional and cost a bit more, but they can be easier to center and less messy to handle. Either type will seal if installed correctly.

How long does a wax ring last?

A properly installed wax ring typically lasts 20 to 30 years. It fails sooner if the toilet rocks or shifts, if the flange is damaged, or if the floor settles. If your toilet has been in place for decades and you are seeing leaks, the wax ring is likely the culprit.

What if the bolts are stuck and will not unscrew?

Spray the bolt nuts with penetrating oil (like WD-40) and let it soak for 15 to 30 minutes. Try again gently. If they still will not budge, stop and call a plumber—forcing a stuck bolt can break the porcelain or strip the threads, making the job much harder.