Toilet Leaking at the Base? How to Replace the Wax Ring

Why Your Toilet Leaks at the Base

If you see water pooling around the bottom of your toilet every time you flush, the most likely cause is a failed wax ring. The wax ring is a thick wax seal that sits between the bottom of the toilet and the drain flange in the floor. Its job is simple: keep water and sewer gas from escaping the connection between the toilet and the drain pipe.

Over time, wax rings compress, dry out, or get displaced — especially if the toilet has been rocking or was disturbed during a bathroom renovation. Once the seal breaks, water leaks out every flush. Sometimes you'll also notice a faint sewer smell, which means gas is escaping through the same failed seal.

The fix requires pulling the toilet off the floor, scraping the old wax ring away, and setting the toilet back down on a fresh one. It sounds intimidating, but it's a straightforward job that takes about 20 to 30 minutes and costs under $15 in parts if you do it yourself. A plumber in Oakland or Macomb County will typically charge $150 to $350 for the same job, depending on conditions.

What You'll Need

Parts: a new wax ring (available at any hardware store — grab a standard thickness or a double-thick "extra seal" version if your flange sits below the finished floor), a new toilet supply line (12-inch or 16-inch stainless braided), and a new set of mounting bolts with washers and caps.

Tools: a flathead screwdriver, channel-lock pliers, rubber gloves, a few old towels, a bucket or container, and a plastic putty knife or scraper. That's it — no specialty tools required.

We always recommend replacing the supply line while you're at it. Once a rubber washer inside an old supply connection has been disturbed, it often won't reseal properly. A new braided supply line costs a few dollars and eliminates one potential callback.

Step 1: Shut Off the Water and Drain the Toilet

Turn off the water at the shutoff valve behind the toilet. If it's a quarter-turn ball valve, rotate the handle 90 degrees. If it's an older multi-turn valve, turn it clockwise until it stops. Flush the toilet to drain most of the water from the tank.

There will be some water left in the bottom of the tank and in the bowl. Soak it up with an old towel — you can wring it out into the bathtub if one is nearby, or into a bucket. Get as much water out as you can. The less water in the toilet when you lift it, the lighter it is and the less mess you'll make.

Step 2: Disconnect and Remove the Toilet

Start by disconnecting the supply line from the bottom of the tank. Use channel-lock pliers to loosen the nut, then unthread it by hand. Have a towel underneath to catch the small amount of water that drains out.

Next, pop the plastic caps off the two mounting bolts at the base of the toilet — a flathead screwdriver pries them off easily. Use your channel-locks to loosen and remove the nuts. If the bolts spin, hold them with pliers from above while you turn the nut from below.

If there's caulk or silicone around the base, score through it with a plastic putty knife so the toilet can separate from the floor. Then grab the toilet bowl with both hands (near the seat hinge area), rock it gently to break the wax seal, and lift straight up. Toilets weigh 50 to 80 pounds depending on the model, so lift with your legs. Set the toilet on its side on a towel or old sheet, away from your work area.

Stuff a rag or old towel into the open drain hole in the floor. This keeps sewer gas from coming up into the bathroom while you work and prevents anything from falling into the pipe.

Step 3: Remove the Old Wax Ring and Inspect the Flange

The old wax ring will either be stuck to the bottom of the toilet or sitting on the flange in the floor — sometimes both. Scrape it all off with your putty knife. Get the surfaces clean on both the toilet horn (the outlet on the bottom of the toilet) and the top of the flange. Old wax is sticky and messy, which is why gloves are non-negotiable here.

With the wax removed, inspect the flange. It should be sitting flush with or slightly above the finished floor, with no cracks or broken bolt slots. If the flange is cracked, corroded, or sitting more than a quarter inch below the floor surface, a standard wax ring may not seal properly — you'll either need a double-thick wax ring or a flange repair, which is where calling a pro starts to make sense.

Also check the condition of the mounting bolt slots in the flange. If the slots are stripped or the old bolts were corroded, now is the time to replace them. New bolts slide into the flange slots and stand straight up, ready for the toilet to drop over them.

Swap your gloves for a fresh pair before handling the new wax ring — you don't want old wax or debris contaminating the new seal.

Step 4: Set the New Wax Ring and Reset the Toilet

Press the new wax ring onto the flange, centering it over the drain opening. The wax should be at room temperature so it's pliable — if it's been sitting in a cold garage, warm it up with your hands first. Some people prefer to stick the wax ring to the bottom of the toilet instead of the flange. Either way works, but setting it on the flange keeps it in position while you lower the toilet.

Pull the rag out of the drain hole. Lift the toilet and carefully lower it straight down over the mounting bolts, aiming the bolt holes in the base over the bolts sticking up from the flange. This is the most important part: drop the toilet straight down and press firmly. You need a solid, even "squish" of the wax ring to create a complete seal. Once the toilet is down, don't lift it back up — if you break the seal you've just made, you'll need a new wax ring.

Press down on the toilet with your body weight, rocking very slightly to seat the wax evenly. Slide the washers and nuts onto the mounting bolts and hand-tighten. Then use your channel-locks to snug them down — alternate a quarter turn on each side so the toilet draws down evenly. Stop once you feel firm resistance. Over-tightening will crack the porcelain, and that turns a $10 repair into a $500 replacement.

Snap the bolt caps into place.

Step 5: Reconnect and Test

Thread the new supply line onto the fill valve connection at the bottom of the tank and onto the shutoff valve at the wall. Hand-tighten both ends, then snug each connection with your channel-locks — just past hand-tight. Don't over-tighten or you'll strip the plastic threads on the fill valve.

Turn the water back on and let the tank fill. Watch the supply line connections for any drips. Flush once and immediately check around the base — no water should appear on the floor. Flush a few more times to confirm.

Finish by running a bead of silicone caulk around the base where the toilet meets the floor. This isn't for the seal — the wax ring handles that — it's to keep water from splashing or mopping underneath the toilet, and it helps prevent the toilet from shifting over time. Leave a small gap at the back of the toilet so that if the wax ring ever fails again in the future, water has somewhere to escape where you'll notice it instead of being trapped under a sealed base.

When to Call a Professional

Pulling and resetting a toilet is a manageable DIY job when the flange is in good condition. But some situations warrant calling a pro:

If the flange is cracked, corroded, or broken, it needs to be repaired or replaced before the toilet goes back down. Depending on the flange type and how it connects to the drain pipe, this can range from bolting on a repair ring (simple) to cutting and replacing a section of pipe (not simple). If the flange is sitting well below the finished floor — common after tile or flooring upgrades — even a double-thick wax ring may not seal reliably, and the flange may need to be raised with an extension ring. If the subfloor around the flange feels soft or spongy, the leak has already caused water damage, and the subfloor needs to be repaired before the toilet goes back.

At The Toilet Guys, a standard pull-and-reset with a new wax ring starts at $150. If the flange needs repair work, we'll assess the situation and give you an upfront price before we start. Every job includes a new wax ring, new supply line, and our wobble-free guarantee. If the toilet itself is past its prime, replacements start at $499 installed — and we haul away the old one.