Running toilets are worth fixing quickly. A constantly running toilet can waste a large amount of water, and it is one of the most common causes of unexpectedly high water bills.
What this service solves
- Running or refilling on its own
- Clogs and weak flushes
- Leaks at the base or between tank and bowl
- Rocking or loose toilets
- Slow tank refill
Common symptoms
- Hissing or trickling sound
- Tank refilling with no one using it
- Water on the floor around the base
- Bowl drains slowly or overflows
- Toilet rocks when sat on
Most likely causes
Worn flapper
A warped or mineral-coated flapper lets water seep into the bowl, so the tank keeps refilling.
Fill valve problems
A fill valve set too high sends water down the overflow tube; a worn one may hiss or refill slowly.
Failed wax ring
Leaks at the base often come from a compressed or broken wax ring, especially if the toilet rocks.
Clogs in the trap
Too much paper, wipes or objects lodge in the toilet's built-in trap.
Partial drain blockage
Weak flushes may come from mineral-clogged rim jets or a partly blocked drain or vent.
How the problem is diagnosed
- Food-coloring test for flapper leaks
- Check water level against the fill line
- Check bolts and wax ring if leaking at base
- Determine if other fixtures are slow (main line)
Repair and replacement options
| Option | Best for | What to know |
|---|---|---|
| Flapper or fill valve replacement | Running toilets | Standard, inexpensive parts for most toilets. |
| Wax ring and bolt replacement | Base leaks and rocking | Requires removing the toilet; flange may need repair. |
| Clearing the trap | Clogs | Plunger, closet auger or toilet removal for lodged objects. |
| Toilet replacement | Cracked porcelain or repeated issues | Also an opportunity to install a lower-flow model. |
What a plumber normally does
- Diagnose the failing part
- Shut off the toilet supply and drain the tank
- Replace parts or reseat the toilet
- Test fill, flush and seal
Emergency warning signs
- Overflowing toilet that will not stop after closing the valve
- Sewage rising in other drains
If you see any of these, shut off water first. See emergency plumbing steps.
What affects the cost
We don’t publish national price figures because real quotes vary too much by region, access and the condition of your system. These are the factors that move the price:
- Part needed
- Toilet brand and model-specific parts
- Flange repair
- Removal and reinstallation
Ask for a written quote that names the method, materials and any permit or restoration work before work begins.
DIY vs. calling a professional
Reasonable for homeowners
- Flapper and fill valve replacement
- Plunging
- Tightening tank bolts carefully
Call a professional for
- Flange repair
- Leaks into the ceiling below
- Recurring clogs
Prevention and maintenance
- Flush only toilet paper
- Replace flappers when they stiffen
- Do not use in-tank bleach tablets, which can degrade rubber parts
Specific toilet repair services
Toilet Repair: common questions
What causes a toilet to keep running?
Usually a worn flapper letting water leak into the bowl, or a fill valve set too high so water flows into the overflow tube. Both are inexpensive parts.
How do I know if my toilet is leaking?
Add a few drops of food coloring to the tank and wait 15 to 30 minutes without flushing. If color appears in the bowl, the flapper is leaking.
Why does my toilet leak at the base?
The wax ring seal under the toilet has likely failed, often because the toilet rocks. It needs to be removed and reset with a new seal.
Why is my toilet flush weak?
Low tank water level, a flapper closing too early, mineral-blocked rim jets, or a partial clog in the trap or drain are common causes.
Why is my toilet overflowing?
A clog in the toilet trap or drain line. Close the supply valve behind the toilet immediately. If other drains are also backing up, the main line is likely blocked.
