Toilet Leak Detection & Repair in Cibolo, TX
Toilet that runs on its own, hisses, or leaves water at the base? Get the leak found and fixed before it raises your bill or damages the floor.
Call (210) 750-1568- Open 24/7 · Cibolo, TX 78108
- Non-invasive detection
- Repair options explained
What is toilet leak detection?
Toilet leak detection finds where a toilet is losing water, either silently into the bowl through a worn flapper or fill valve, or onto the floor through a failed wax ring, supply line or cracked tank. A dye test, moisture meter and inspection of the seal and supply line pinpoint the source so the right part is fixed.
Toilet leaks come in two kinds. Silent leaks let water trickle from the tank into the bowl and down the drain, wasting water and money without leaving a mark. Floor leaks let water escape at the base or supply line, where it can soak flooring and the subfloor before you notice.
Signs of a leaking toilet
- Tank refills by itself between flushes
- Constant hissing or trickling sound
- Water pooling around the base
- Toilet rocks or feels loose
- Stained, soft or warped flooring nearby
- Sewer smell in the bathroom
- Drips from the supply line or shutoff valve
- Water bill higher than usual
Where toilets leak
| Part | What happens | Where the water goes |
|---|---|---|
| Flapper | Worn or warped rubber stops sealing | Into the bowl, a silent leak |
| Fill valve | Water level set too high or valve won't shut off | Down the overflow tube into the bowl |
| Wax ring / flange | Seal under the toilet fails or the toilet shifts | Onto the floor and subfloor |
| Supply line and shutoff | Cracked line, loose nut or worn valve | Behind the toilet onto the floor |
| Tank-to-bowl bolts and gasket | Gasket hardens or bolts corrode | Drips from under the tank |
| Tank or bowl | Hairline crack in the porcelain | Slow seep onto the floor |
Check your toilet in 15 minutes
- Dye test. Add a few drops of food coloring to the tank. Don't flush for 15 minutes. Color in the bowl means the flapper or valve is leaking.
- Check the water level. Lift the tank lid. If water runs into the overflow tube, the fill valve is set too high or failing.
- Inspect the supply line. Feel the line and shutoff valve behind the toilet for moisture.
- Dry the base and watch. Wipe the floor around the base dry, flush a few times, and look for water returning.
- Rock test. A toilet that moves when you sit or push on it may have broken the wax seal.
If every toilet passes and the meter still shows a leak, follow our hidden water leak guide to check for a slab leak.
When to call a professional
- Water keeps appearing at the base after you've checked the supply line
- Flooring around the toilet is soft, stained or lifting
- You smell sewer gas, which can mean a failed seal
- The leak returns after a DIY fix
- The meter shows a leak even with the toilet shut off
On slab homes, water from a failed toilet seal can travel under flooring before it shows. A pro can check moisture around the base with a meter or thermal camera to see how far it has spread.
What affects toilet leak repair cost?
- The part that failed: flapper, fill valve, wax ring, supply line or tank gasket
- Whether the toilet has to be pulled and reset
- A damaged flange or subfloor that needs repair
- Flooring that needs drying or replacement
- Repair vs replacing the toilet
Ask for the price before work starts and whether it includes resetting the toilet with a new seal.
How much does toilet leak repair cost in Cibolo?
Most toilet leak repairs in Cibolo cost about $150 to $400 with a plumber, including parts. A flapper or fill valve is at the low end. Resetting the toilet on a new wax ring, or repairing a cracked flange, is at the higher end. Water damage to the subfloor is extra.
| Toilet job | Typical range |
|---|---|
| Flapper or fill valve replacement | $150 – $300 |
| Supply line or shutoff valve | $100 – $250 |
| Reset toilet with new wax ring | $175 – $400 |
| Closet flange repair | $250 – $550 |
| New toilet installed (basic model) | $400 – $900 |
Ranges are approximate 2026 estimates for the Cibolo and northeast San Antonio area, gathered from typical local pricing. They are not quotes. The provider gives you a price before any work starts.
Repair or replace the toilet?
Inside parts are cheap and almost always worth replacing. Replace the toilet when the tank or bowl is cracked, when it clogs often, or when it's an older model using 3.5 gallons or more per flush. A WaterSense toilet uses 1.28 gallons or less.
DIY safety
Turn the shutoff behind the toilet clockwise before you take anything apart. If the valve won't turn or it drips, don't force it. Use the main shutoff instead. If the floor near the toilet is soft or stained, water may have reached the subfloor, so have it checked. A running toilet won't explain every high bill. If dye tests pass, see leak detection in Cibolo, TX.
Frequently asked questions
How do I know if my toilet is leaking?
Listen for the tank refilling on its own (a "phantom flush") or a constant hiss, and look for water around the base. The easiest test is to add a few drops of food coloring to the tank and wait 15 minutes without flushing. Color in the bowl means water is leaking from the tank.
Can a running toilet really raise my water bill?
Yes. A toilet that runs or leaks into the bowl does it around the clock, so it can quietly add a lot of water to each billing cycle. It's one of the most common causes of a sudden high bill.
Why is there water around the base of my toilet?
Water at the base usually comes from a failed wax ring or flange seal, a loose toilet, a leaking supply line, or condensation on the tank in humid weather. A leak at the seal is the one to deal with quickly, because it can soak the subfloor and flooring.
Is a leak under the toilet a slab leak?
Not necessarily. Most water around a toilet comes from the toilet seal or supply line. If the floor stays wet after the toilet is reset, or the meter shows a leak with the toilet shut off, the problem may be in the plumbing under the slab.
Should I replace the toilet or just fix the leak?
Most toilet leaks are fixed with inexpensive parts such as a flapper, fill valve, wax ring or supply line. Replacement makes sense when the tank or bowl is cracked, or the toilet is old and keeps needing repairs.
How do I stop a leaking toilet right now?
Turn the shutoff valve behind the toilet clockwise to stop water to the tank, then flush to empty it. Wipe up any water around the base so you can see whether it returns.
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