Toilet Leaking at the Base — Wax Ring Replacement

Water pooling at the base of the toilet after flushing almost always means the wax ring seal between the toilet and the drain flange has failed. This repair requires removing the toilet, replacing the wax ring, and reinstalling — a manageable DIY project that takes about an hour.

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   Step 1: Confirm the leak is from the base, not a condensation or supply issue

   Dry the floor completely and watch for water during and immediately after a flush. Base leaking during the flush indicates the wax ring. Water that appears between flushes is condensation on the cold porcelain tank in humid environments — not a wax ring issue. Water near the supply valve is a supply line or valve leak.

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   Step 2: Shut off the water and empty the toilet

   Turn off the water supply valve behind the toilet. Flush to empty the tank and bowl as much as possible. Use a sponge and bucket to remove the remaining water from both the tank and bowl — the toilet is very heavy and removing water makes it lighter and prevents spills during removal.

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   Step 3: Disconnect and remove the toilet

   Disconnect the water supply line from the tank. Pry off the caps at the base of the toilet to expose the floor bolts (closet bolts). Remove the nuts with an adjustable wrench. The toilet is now only sitting on the wax seal. Rock the toilet gently side-to-side to break the wax seal, then lift straight up. Toilets weigh 50–100 lbs — get a helper if possible. Set the toilet on its side on cardboard or old towels.

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   Step 4: Remove the old wax and inspect the flange

   Use a putty knife to scrape all old wax off both the toilet horn and the floor flange. Inspect the flange: it should be flush with or slightly above the floor and be undamaged. A cracked or corroded flange must be repaired before installing a new wax ring, as no wax ring will seal against a broken flange. Repair flanges are available for cast iron and PVC flanges.

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   Step 5: Install new wax ring and reset the toilet

   Press the new wax ring onto the toilet horn (the bottom of the toilet), wax side facing down. If the flange is below floor level, use a wax ring with an extra-thick ring or a foam wax-free gasket to bridge the gap. Align the toilet over the closet bolts, lower it straight down, and press firmly while sitting on it to compress the wax evenly. Thread the nuts back on the bolts, alternating sides, and hand-tighten. Do not overtighten — you will crack the toilet base.