Why does my toilet rock back and forth?

A rocking toilet is almost always caused by a loose or failed wax ring seal at the base, or loose floor bolts (called closet bolts) that anchor the toilet to the floor flange. This is something you'll want to address promptly — a rocking toilet can cause serious water damage if left alone.

The most common culprit is simply that the two bolts at the base of your toilet have loosened over time. You can try tightening the plastic caps at the base of the toilet, removing them and snugging up the nuts underneath with a wrench. Be careful not to overtighten — porcelain cracks easily. If the toilet stops rocking after this, you may be in the clear.

If tightening the bolts doesn't fix it, the problem is likely a damaged or compressed wax ring. The wax ring creates a watertight seal between the toilet and the drain flange in your floor. When a toilet rocks repeatedly, it breaks that seal — and a broken wax ring means sewer gases and even sewage water can leak under your floor, causing rot, mold, and structural damage that's far more expensive to fix than the original problem.

A third possibility is an uneven floor or a damaged floor flange. Older Ottawa homes — especially those with tile or vinyl flooring that's been replaced over the years — sometimes have floors that aren't perfectly level around the toilet. In this case, plastic toilet shims can stabilize the toilet before the wax ring is replaced.

In Ottawa, a toilet reseal (wax ring replacement) typically runs $200 – $400 depending on the condition of the flange and whether any subfloor damage is found. If the floor flange itself is cracked or sitting too low, that adds to the repair cost.

Don't ignore a rocking toilet. Even a small amount of movement is enough to slowly break the wax seal. Watch for soft or discoloured flooring around the base, a musty smell, or water stains — these are signs the seal is already compromised.

If tightening the bolts doesn't solve the rocking, it's worth having a plumber pull the toilet, inspect the flange, and install a fresh wax ring. For a free estimate on your repair, feel free to reach out to Ottawa Pro Plumbing — it's a straightforward job that protects you from much bigger problems down the road.