Toilet Overflow: What To Do First
By HomeAssist Connect Editorial Team ·
Short answer: Turn the shut-off valve behind the toilet clockwise to stop the water. If you can't reach it, take off the tank lid and lift the float. Then clean up and try a plunger. If water rises in other drains, the problem is likely in the main line.
Stop the water
The shut-off valve is usually on the wall behind the toilet near the floor. Turn it clockwise. If it's stuck, lift the float in the tank to stop it from filling.
Clear the clog
Use a flange plunger with a good seal and firm, steady strokes. A toilet auger can reach deeper clogs. Avoid chemical drain cleaners in toilets.
When to call a plumber
- Water backs up into a tub or shower when you flush.
- Several fixtures are slow at the same time.
- The toilet clogs repeatedly.
- Water leaks from the base after the overflow.
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This guide is general information, not professional advice. For gas, electrical or structural concerns, contact a qualified professional.