Over time, this seal can loosen or have a defect, causing water to leak through and flood your floor A toilet leaking underneath the floor is a hidden maintenance issue that requires attention to prevent structural damage You may notice water stains on your ceiling if your bathroom is upstairs.
Toilet Leaking Through Floor To Basement – Clsa Flooring Guide
Understanding the problem identify the signs of a leak okay, so you suspect your toilet is leaking
What are the telltale signs
This is the most obvious Look for puddles around the base of the toilet, on the flooring, or even damp spots on the ceiling below (if you have a downstairs bathroom). Toilet leaking is one of the fastest ways to waste water, spike bills, and ruin floors (epa, 2025) If you’re spotting water around the base, hearing the toilet refill on its own, or seeing a sudden jump on your water bill, you’re in the right place
The first step to correcting this issue will be to determine where the water is leaking from Is the leak coming from the base of the toilet If you see a noticeable crack around the base of the toilet or in the toilet tank, it will need to be replaced If you inspect the base and tank and no cracks are visible, this would suggest that the wax ring needs to be replaced
