The constant runner
A toilet that runs constantly is the most common complaint and, happily, usually the cheapest fix. The sound of water trickling or the tank refilling on its own means water is escaping from the tank into the bowl, almost always through a worn flapper (the rubber seal at the bottom of the tank) or a fill valve that will not shut off properly. Both are inexpensive parts and a quick replacement.
It is worth fixing promptly because a running toilet is the biggest water-waster in the house, a badly leaking flapper can waste hundreds of gallons a day, and it all shows up on your OWASA bill. This is a genuine repair, not a reason to replace the toilet, and it is often the first thing a plumber checks. If you jiggle the handle to make it stop, that is the flapper telling you its time is up.
| Symptom | Likely cause | Fix |
|---|---|---|
| Runs constantly | Worn flapper or fill valve | Replace the part (cheap) |
| Weak or partial flush | Clog or mineral in the jets | Clear and clean the rim |
| Rocks at the base | Loose bolts or failing flange | Reset, shim, repair flange |
| Water at the base after flush | Failed wax seal | New seal, check the flange |
The weak or partial flush
A toilet that does not fully clear the bowl, or needs two flushes, is usually one of two things. Either there is a partial clog in the trap or the line, or, more slowly developing, mineral buildup has clogged the small rim jets under the bowl edge that direct water into the bowl. Weak rinse-down often traces to those jets rather than to a weak flush overall.
On an older high-volume toilet, chronic weak flushing plus the water waste of an outdated design is sometimes the moment to consider a modern efficient replacement, though not every low-flow toilet clears equally well, so the model matters. A partial clog that keeps returning, especially if other fixtures are also sluggish, can point past the toilet to a drain or main-line issue, which is worth ruling out before blaming the fixture.
The rocking base and the leak below
A toilet that rocks when you sit is not a cosmetic annoyance, it is a warning. The rocking loosens and eventually breaks the wax seal underneath, and once that seal fails, every flush seeps water into the floor. The tells are a base that moves, water pooling around the bottom after a flush, or a persistent smell. This is the toilet problem to take most seriously.
It matters most in Chapel Hill's older, crawl-space homes, because a failing wax seal or corroded flange lets water seep into the subfloor with every flush, quietly rotting the floor around the toilet until a five-dollar seal becomes a subfloor repair. If it has been leaking a while, it can even become a water damage job under the bathroom. A rocking toilet should be reset on a fresh seal and a sound flange sooner rather than later.
Repair or replace, and doing the install right
Most toilet problems, running, weak flush, a rock that just needs resetting, are repairs. Replacement makes sense when the bowl is cracked, when it chronically clogs, or when an old high-volume model is worth swapping for an efficient one that pays for itself in water use. If you do replace, the parts you cannot see are what make it last: the install has to set the new toilet on a sound, correct-height flange with a fresh seal.
Setting a new toilet on an old, corroded or below-floor-level flange is the single most common reason a "new" toilet rocks or seeps within a year, so a proper install checks and repairs the flange, sets a fresh wax or rubber seal, and shims and bolts the base so it does not move. In older homes it is also worth swapping the seized shutoff and the supply line at the same time, so the next repair does not start with a valve that will not turn.
If you are choosing a replacement, a word on efficient models: the water savings from a modern low-flow toilet are real, but flush performance varies a lot between models, and an underpowered one that needs two flushes saves nothing. The good news is that flush performance is well documented, so it is easy to choose a model that uses little water and still clears the bowl in a single flush. We are happy to point you toward the ones that do both, so you get the lower water bill without the double-flush frustration.
Questions we get
A lot, often hundreds of gallons a day if the flapper leaks badly, which shows up on your OWASA bill. It is one of the cheapest repairs in plumbing and one of the most worth doing promptly.
The wax seal underneath has failed, or the flange it seats on is corroded or too low, so every flush seeps into the floor. In a crawl-space home that can rot the subfloor, so it is worth fixing quickly rather than caulking over it.
Usually a partial clog or mineral buildup in the small rim jets that direct water into the bowl. Clearing the clog and cleaning the jets often restores it. If several fixtures are sluggish, the issue may be further down the drain line.
Repair simple running or flushing issues. Replace when the bowl is cracked, it chronically clogs, or it is an old high-volume model worth swapping for an efficient one. We will give you the honest math for your fixture.
Almost always the flange, it was corroded, or its height did not match the finished floor, so the toilet was set on an unsound base. A proper reset on a repaired flange with a fresh seal fixes it, and a rocking toilet should not be left, since it breaks its own seal.
Modern models use a fraction of the water older ones did per flush, so on an old high-volume toilet the savings on your OWASA bill are real. The key is choosing a model with good flush performance so it clears in one flush; a weak low-flow toilet that needs two flushes saves nothing. We can point you to ones that do both.
Toilet running, rocking or flushing weakly?
Most of it is a quick repair. A rocking base is the one to call about sooner.