Plumbing · Master Plumber PL17071-M · South Shore MA
Toilet Repair & Installation
Running, rocking, weak flush, or water appearing at the base. Some of these are a ten-minute part. One of them—water seeping at the floor—is quietly rotting your subfloor, and that one should not wait.
Water at the base, or a toilet that rocks? Stop using it and call. That is usually a failed wax seal or a corroded flange, which means waste water is getting under the flooring every flush. Caulking around the base hides it—it does not fix it.
What the Symptom Means
Toilets are simple, which is good news—most complaints come down to one of a handful of parts. Here is what each symptom usually points to.
Runs constantly
A worn flapper or a fill valve that will not shut off. Cheap parts, quick fix—and worth doing promptly, because a running toilet can waste hundreds of gallons a day and show up on your water bill.
Rocks or leaks at the base
Failed wax seal, loose or corroded closet flange, or a soft subfloor underneath. Needs the toilet pulled to see properly—and it is the one that turns into carpentry if left alone.
Weak or incomplete flush
Often mineral buildup blocking the rim jets and siphon, low tank water level, or a chain with too much slack. Sometimes an early low-flow model that simply never flushed well.
Clogs repeatedly
If it is only this toilet, something may be lodged in the trap—wipes and small toys are the usual finds. If other fixtures are slow too, it is the line. See drain cleaning.
Sweating tank
Condensation from cold supply water meeting humid bathroom air. Annoying but not a leak—though the puddle it leaves looks exactly like one, and it can damage flooring over time.
Cracked tank or bowl
Not repairable—porcelain cracks propagate and eventually let go all at once. Shut the supply valve and plan on replacement. Do not try to seal it.
Replacing a Toilet Properly
A toilet swap looks like four bolts and a wax ring. What separates a lasting job from a callback is what happens once the old one is off the floor: inspecting the flange, checking that the subfloor is solid, and setting the new bowl dead level on a flange at the correct height relative to the finished floor.
Older South Shore homes very often have a flange that has been buried by successive layers of flooring, or a cast iron flange that has corroded away at the bolt slots. Stacking two wax rings to make up the difference is a common shortcut and a common reason a toilet leaks again in two years. We repair or replace the flange instead.
We also replace the supply line and the shut-off valve while we are in there. Those are inexpensive, they are the two parts most likely to fail next, and doing them now means nobody has to pull the toilet again to reach them.
Common Questions
How do I tell if my toilet is leaking into the bowl?
Put a few drops of food coloring in the tank and do not flush for twenty minutes. If color shows up in the bowl, the flapper is not sealing. That silent leak is one of the most common causes of a water bill that jumped for no obvious reason.
Are low-flow toilets still bad at flushing?
The bad reputation comes from the first generation in the nineties. Current 1.28-gallon models from good manufacturers clear better than the old water hogs did, because the bowl and trap geometry were redesigned rather than just the volume reduced. Model choice still matters, and we will steer you.
Should I get comfort height?
Most adults prefer the taller bowl, and it is noticeably easier on knees and hips—worth it if anyone in the house has mobility concerns or is planning to age in place. Standard height is often better in a kids’ bathroom.
Can you install a toilet I bought myself?
Yes. Have it on site and unboxed if you can—it lets us check for shipping cracks before we start. Just note the product warranty stays between you and the retailer; our workmanship warranty covers the installation.
Rocking or leaking at the floor?
Do not wait on that one—it gets more expensive the longer it sits.