Toilet repair
What toilet repair covers, and where it stops
Toilet repair is the diagnosis and replacement of the few parts that make a toilet work: the fill valve, the flapper or flush valve, the supply line, the wax ring or gasket under the bowl, and the closet flange bolted to the floor. Most calls come down to one of those five.
A toilet is a simple machine with a short list of ways to fail. The tank holds about 1.28 to 1.6 gallons per flush on a modern unit, and gravity does the rest. When something goes wrong, the symptom usually tells you which part to suspect, and we work from that list instead of swapping parts until it stops.
When the repair is not worth doing, for example a cracked bowl or a tank with a hairline split, we say so and set a new toilet. That is the installation half of this page, and it gets its own section below.
When a toilet is overflowing or leaking through the ceiling below
An overflowing bowl is urgent, and so is a base leak on an upper floor of a townhome or condo, where the water goes through the ceiling below. We take these calls 24/7, including nights and weekends, and book same-day visits when the schedule allows.
Do the first two steps below before anything else. They cost nothing and usually stop the spill within a minute.
While you wait for the plumber
- Reach behind the bowl and turn the oval supply stop clockwise until it stops. If it is stuck, do not force it with pliers.
- Lift the tank lid and push the flapper down, or lift the float, so the tank stops refilling.
- Do not flush again, and do not plunge if the water is climbing. Mop the floor with towels so it does not run to a wall.
- Find the main shutoff for the house, in case the supply stop will not turn. Know where it is before you need it.
- Keep everyone out of the room if the bowl overflowed from a backed-up drain, because that water is not clean.
What the toilet is telling you
Match the symptom, then read the likely cause. These are the usual suspects, not a guarantee, and a pressure test or a quick look under the tank settles it.
- Water runs every few minutes.
The flapper is not sealing, the chain is too tight, or the fill valve is set too high and spilling into the overflow tube. A drop of food coloring in the tank, left for 15 minutes, shows a flapper leak if color reaches the bowl.
- Puddle around the base.
Either the wax ring has lost its seal or the closet bolts have let the bowl move. Sweat on a cold tank looks similar, so we wipe everything dry and watch where the first bead forms.
- The bowl rocks when you sit.
A rocking toilet breaks its own seal. Causes include a flange sitting below the finished floor, a rotted subfloor, or bolts that were never snug. Tightening alone seldom fixes it.
- Slow flush and a gurgle in a nearby drain.
That points past the toilet, at a partial blockage in the branch line or the vent. A closet auger clears the trap, but a gurgle in the shower too means the line needs a look.
- Tank refills with a hiss that never stops.
The fill valve seat is worn or debris is lodged in it. Fill valves are cheap and quick to replace, along with the supply line while the water is off.
- Water pools on the floor only after a flush.
The leak is on the drain side, usually the wax ring or flange. A leak that appears with every flush stains the subfloor even when the surface looks dry.
How we find the fault without guessing
We work from the outside in, so you are not paying to replace a part that was fine.
- 1
Dry it and test the supply
We dry the tank, supply line and base, then check the stop valve and the braided supply line for weeping at the nut. A failed supply line is the most overlooked leak under a toilet.
- 2
Test the flush mechanism
Lift the lid and watch a full cycle. The flapper seat, chain slack, overflow tube height and fill valve are all checked in under a few minutes.
- 3
Pull the bowl when the seal is suspect
If the leak points to the base, we shut the water, drain the tank, lift the bowl and inspect the flange, the closet bolts and the floor. A cracked flange ring or a soft subfloor changes the scope, and we tell you before we continue.
- 4
Clear a clog with the right tool
A flat-flange plunger and a closet auger handle most stoppages. If the auger returns clean and the bowl still backs up, a drain camera shows whether the problem is in the branch line.
Repair or replace the toilet
Not every toilet deserves another repair. This is how we usually weigh it, and you make the call.
| Situation | Usually best | Why |
|---|---|---|
| Worn flapper or fill valve | Repair | Parts are standard, and the porcelain is sound. |
| Weeping base, bowl intact | Reset on a new wax ring or gasket | The seal failed, the toilet did not. |
| Flange cracked or below floor level | Repair the flange, then reset | A new ring cannot seal against a broken flange. |
| Hairline crack in bowl or tank | Replace | Cracks leak without warning and cannot be sealed reliably. |
| Chronic clogging on an older high-flow bowl | Consider replacing | A better trapway design clears waste in one flush. |
| Rental unit with repeat calls | Replace with a common model | Standard parts keep later repairs short. |
If the toilet is an older 3.5 gallon unit, a modern bowl uses far less water per flush, which shows up on the bill.
Toilet on the floor or running all night?
Describe the symptom and we will tell you what to shut off while we head your way.
Toilet installation, done to last
A new toilet is only as good as the flange and the seal under it. Our installs begin with the floor, and the bowl comes second.
Measure the rough-in
The rough-in is the distance from the finished wall to the center of the drain, and it is typically 12 inches, though 10 and 14 exist. Buying the wrong one leaves a gap or a bowl that will not fit.
Check the flange
The flange should sit flush with or just above the finished floor, and the closet bolts must be centered. We repair or extend a low flange before the bowl goes down.
Set on a fresh seal
We use a new wax ring or a wax-free gasket, set the bowl straight and tighten the bolts in alternating turns. Over-tightening cracks porcelain.
Test before we leave
We flush several times, check the supply connection for drips, and caulk the base only where local practice calls for it, leaving the back open on tile so a future leak is visible.
Manhattan Beach note
Toilets in Sand Section homes and across Manhattan Beach
Homes in the Sand Section sit close to the ocean, and chrome or brass supply stops and bolt caps can corrode faster in salt air. If the stop valve behind your bowl turns stiffly or is crusted green, have it replaced during any toilet visit so it works the night you need it.
Manhattan Beach water is a blend of local groundwater and imported surface water. The City's 2023 Annual Water Quality Report lists groundwater hardness at an average of 392 mg/L, which is roughly 23 grains per gallon. Hard water leaves scale on fill valve seats and on the rim jets, so a toilet that hisses or flushes weakly may need descaling and a new fill valve, not a new toilet.
Sources: City of Manhattan Beach
What decides the cost of a toilet repair
We give a clear price before work starts. These are the factors that move it up or down.
A flapper or fill valve is a short job. A wax ring reset takes longer because the bowl comes off.
A broken flange or soft subfloor adds repair work that only shows up once the bowl is lifted.
Standard parts cost less than a specialty or wall-hung carrier. A new toilet ranges widely by model.
An upstairs unit with a tile surround or a tight closet takes more time than a ground-floor bathroom.
Night and weekend dispatch can cost more than a daytime booking, and we explain that before we start.
Homeowner policies often cover sudden water damage from a supply line failure but not a slow leak from a worn seal. Ask your insurer, and keep photos of the damage.
Rentals and multifamily
Toilets in rentals, condos and apartment buildings
In a multifamily building, a toilet leak can reach a neighbor below within hours. Tenants should shut the supply stop and tell the property manager, then we can coordinate access with the owner.
Owners of rentals often ask for a standard model so later repairs use the same flapper and fill valve. We can set that up when we install, and note the model for your records. For a recurring clog in a stack shared by several units, a drain cleaning visit with a camera is more useful than another plunge.
Related work
When the toilet is a symptom of something bigger
If several fixtures gurgle or back up together, the trouble is in the main line, and sewer line cleaning is the right fix. Remember that in Manhattan Beach the lateral from your home to the City main is your responsibility. If you plan to flush or clean it, the City asks for 24 to 48 hours notice at (310) 802-5304.
A bathroom that needs more than a toilet swap, like a moved drain or new fixtures, belongs under plumbing installation. We also serve Hermosa Beach if you are just over the line.
FAQs
Toilet repair questions
Yes. The dispatch line is open 24/7. An overflowing bowl or a base leak through a ceiling is treated as urgent, and we book same-day visits when available. Shut the supply stop behind the bowl while you wait.
Almost always a flapper that no longer seals, or a chain with the wrong slack. Mineral scale from hard water can roughen the flapper seat as well. It is a quick repair.
Snug bolts help a loose bowl, but a leak usually means the wax seal has failed. Tightening hard can crack the porcelain. The bowl needs to come off for a proper fix.
Repair when the porcelain is sound and the parts are standard. Replace for cracks, repeat clogs on an old high-flow design, or when repair would cost close to a new unit.
It is the ring on the floor that the bowl bolts to and that connects the bowl outlet to the drain. If it is cracked or sits too low, the wax ring cannot seal.
Yes, in most cases. Check that the rough-in matches the bowl, and keep the box so we can read the specification sheet. We confirm the fit before setting it.
Stop if the water keeps rising, if other fixtures gurgle, or if two plunges do nothing. Those signs point past the bowl.