Toilet Overflowing? How to Stop It Fast
Modern Perspective Plumbing, licensed plumbing contractor in Grover Beach, serving San Luis Obispo County
Turn the small valve behind the toilet clockwise until it stops. Don't flush again. If other drains are also backing up, the problem may be your main sewer line, so stop using water and call.
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What to do first
- Turn the stop valve behind the toilet clockwise.
- If the valve won't work, lift the tank lid and raise the float to stop the fill, then shut off the main water valve.
- Don't flush again.
- Check whether a tub, shower or other drain is backing up too.
Call right away if
- Sewage is coming up in a tub, shower or floor drain
- The valve won't stop the water
- Water is reaching a ceiling below or electrical equipment
We answer Monday–Friday 8AM–5PM. After hours, we take your details and call back first thing the next business morning, or Monday morning on weekends. No crew goes out overnight.
What usually causes it
- Clog in the toilet. If only this toilet is affected, it's usually a local clog.
- Main line blockage. If other drains back up too, the blockage is likely farther down the line.
- Fill problem. If water keeps running into the bowl, the tank parts may be stuck.
Coming out to look is free, and you get the price before any work starts. Learn more about our drain cleaning.
Common questions
Should I keep plunging?
If only one toilet is affected and the bowl isn't about to spill, a few tries are fine. If other drains are affected, stop and call.
Is overflow water dangerous?
It can carry sewage, so keep people and pets away, wear gloves and clean the area well.