How to Reseat a Toilet

A toilet sits on a closet flange bolted to the floor, sealed by a wax ring that prevents water from seeping into the subfloor. When that seal fails—through age, movement, or poor installation—you get puddles, smells, or a rocking bowl. Reseating means pulling the toilet, replacing the wax ring, and bolting it back down square and stable. Done right, the job buys you another decade of leak-free service. Done wrong, you're mopping up gray water and fighting rot in the joists. The difference comes down to a clean flange, a proper seal, and not overtightening the bolts.

1. Stop the Water Flow. Turn the shutoff valve clockwise until snug—it's on the wall behind the toilet, low and left. Flush once to empty the tank, then hold the handle down to get as much water out as possible. Use a sponge and bucket to remove remaining water from the bowl and tank. Disconnect the supply line at the shutoff with an adjustable wrench.
2. Lift Out the Old Toilet. Pop the bolt caps off the base with a flathead screwdriver. Remove the nuts with a wrench—if they're rusted, hit them with penetrating oil and wait five minutes. Rock the toilet gently side to side to break the wax seal, then lift straight up. Toilets weigh 70-100 pounds, so get help or use your legs, not your back. Set it on its side on cardboard or towels.
3. Strip the Old Wax. Use a putty knife to scrape all old wax off the flange and the toilet base—get every bit, or the new seal won't mate flush. Check the flange for cracks or breaks, especially where the bolts anchor. If it's cast iron and intact, you're good. If it's cracked plastic, you'll need a repair ring or replacement flange before proceeding. Wipe everything down with rags and a little denatured alcohol.
4. Anchor the Bolts. Slide new brass closet bolts into the flange slots on opposite sides, heads down in the channels. Position them so they're equidistant from the back wall and parallel to each other. If your flange has a capture slot, orient the bolts so they can't spin when you tighten the nuts later. Test-fit the toilet base over the bolts to confirm alignment before seating the wax ring.
5. Press the Seal Ring. Press a new wax ring onto the bottom of the toilet around the horn, with the plastic cone facing away from the toilet if your ring has one. Alternatively, you can set it directly onto the flange—either method works, but setting it on the toilet gives you more control. Keep the wax at room temperature or slightly warm—cold wax doesn't compress and seal properly.
6. Lower and Compress. Remove the rag from the drainpipe. Lift the toilet and align the bolt holes with the closet bolts, then lower straight down without rocking. Once the base contacts the floor, press down firmly on the bowl rim with your body weight to compress the wax ring. Don't twist—just apply even downward pressure for 10-15 seconds. The toilet should settle about a quarter inch.
7. Bolt and Level. Thread washers and nuts onto the closet bolts and tighten in alternating passes—snug the left side a quarter turn, then the right, then repeat. Stop when the toilet feels solid but not cinched—overtightening cracks the porcelain base. Use a level across the bowl front-to-back and side-to-side. If it rocks, slip plastic shims under the low side before final tightening. Snap the bolt caps on and saw off excess bolt threads with a hacksaw.
8. Restore Water and Verify. Reconnect the supply line hand-tight, then snug with a wrench—one turn past hand-tight is plenty. Turn the shutoff valve counterclockwise to restore water. Let the tank fill, then flush three times while watching the base for water seeping out. Check again after an hour. Run a bead of caulk around the base front and sides, leaving the back open for leak detection.