Do you notice a small pool of water where your toilet meets the floor? Does the floor around the toilet feel spongy? Is the finished flooring coming up? If so, you probably have a bad seal between the toilet horn (where the waste exits) and the drain line. Don't procrastinate any longer. Small leaks trapped beneath the toilet will eventually rot floor surfaces, and even the underlying framing. Wait too long and repair costs rise, especially when you figure in replacing finished flooring and sometimes underlayments, subfloors or even the framing.
A toilet has many working parts, and any one of them can wear down and cause problems. Remove the tank lid on the toilet and watch what happens as you flush it. A toilet that continues to run rather than shutting off at the end of the flush cycle is wasting a lot of water. Fixing a running toilet is often remarkably easy. If your toilet rocks slightly when you sit on it, or if you notice water seeping around its base, then it is likely that the wax ring that seals the toilet base to the drain opening has worn out and needs to be replaced.
TESTING THE TOILET TANK WATER FOR A LEAK INTO THE TOILET BOWL
Leak Detector Tablets or food coloring can be used in a tank to confirm a leak but these tablets do not verify where the leak is occurring. The best troubleshooting procedure for determining the leak point is using this water test.
With a full tank, turn the water off at the shut of valve. DO NOT flush the toilet.
Make a mark in the tank at the current water level.
Wait 30 minutes. If the water level has dropped make a new mark at the new water level and continue to wait.
Repeat step 3 until the water level no longer changes.
Reading the water level with simple solutions
The water level will drop down to the level of the leak and stop.
Water drains to the lip of the flapper –
A) The flapper may be worn.
B) The drain seat that the flapper rests on is damaged.
Recommended Solution A: Change flapper
Recommended Solution B: Repair flush valve drain