Overflowing Toilet: Quick Fixes

To stop an overflowing toilet, lift the tank lid and push the flapper down to close it, or lift the float to stop the fill. Then turn the shutoff valve behind the toilet clockwise. Once the water stops, you can clear a simple clog with a plunger. If several drains back up, the problem is likely the main line and a plumber should take a look.

Last updated October 22, 2026.

The first minute: stop the water

1. Don’t flush again. A second flush adds more water to a bowl that cannot drain.
2. Open the tank. Remove the lid and set it somewhere safe, since tank lids are heavy and break easily.
3. Close the flapper. Push the rubber flapper at the bottom of the tank down to stop water flowing into the bowl.
4. Lift the float. Raise the float (a ball on an arm or a cup on a vertical tube) to stop the tank from refilling.
5. Turn off the supply valve. The small valve on the wall or floor behind the toilet turns clockwise to close. If it is stuck, do not force it hard enough to break it; close the main water shutoff instead.

Clean up safely

Overflow water can carry bacteria, especially if the bowl had waste in it. Wear rubber gloves, soak up water with old towels, and disinfect floors and the base of the toilet. Keep children and pets out of the room. If water has soaked into carpet, baseboards, or the wall, dry it quickly with fans; in Florida humidity, mold can start within a few days. If water went through to a ceiling below, turn off nearby lights and avoid the area until it can be checked.

Clearing a simple clog

Use the right plunger. A flange plunger, with a soft extension at the bottom, seals better in a toilet than a flat sink plunger.

1. Make sure there is enough water in the bowl to cover the plunger cup.
2. Place the plunger over the drain opening and press gently to push the air out.
3. Push and pull firmly while keeping the seal, about a dozen times, then pull it away.
4. Repeat a few rounds. When the water drains, turn the supply back on and test with a single flush, keeping a hand ready at the flapper.

A toilet auger (closet auger) is the next step if plunging does not work. It has a protective sleeve to help avoid scratching the porcelain. Feed the cable in, crank it to break up or grab the clog, and pull it back slowly.

Skip harsh chemical drain cleaners in a toilet. They often do not reach the clog, can damage older plumbing, and make the water hazardous if you or a plumber need to plunge or auger afterward. See our guide on unclogging drains safely for more.

What causes toilets to clog?

• Wipes, including “flushable” wipes, paper towels, and feminine products.
• Too much toilet paper in one flush, especially in older low-flow toilets.
• Objects like toys, toothbrushes, or cotton swabs.
• Mineral buildup in rim jets and the siphon jet from hard water, which weakens the flush.
• Partial blockage in the drain line further down.

When it is not just the toilet

If the toilet overflows when you run the washing machine, or water comes up in a tub or shower when you flush, the blockage is likely in the main drain or sewer line. Older homes with cast iron drains, common in parts of Brandon, Palm River, and Progress Village, can develop main line problems. If your home is on septic, a full tank or saturated drain field can also cause backups, especially after heavy rain. In those cases, stop using water and contact a plumber. See our drain cleaning and sewer repair pages.

A toilet that runs or overflows without a clog

If the tank keeps filling until water spills from the overflow tube into the bowl constantly, the fill valve or float may be set too high or failing. That usually is not an overflow onto the floor, but it wastes water. If water appears on the floor around the base with no clog, the wax ring seal or a supply line may be leaking. A plumber can replace these parts.

When to call a plumber

• Plunging and an auger do not clear it.
• More than one drain is backing up.
• The toilet leaks at the base or rocks on the floor.
• Sewage has backed up into the home.
• The shutoff valve is stuck or leaking.

For urgent situations, see our emergency plumbing page for first steps, then send a request.

Frequently asked questions

How do I stop a toilet from overflowing?

Open the tank, push the flapper down, lift the float, and close the supply valve behind the toilet. If the valve is stuck, close the main water shutoff.

Should I use a chemical drain cleaner in a clogged toilet?

It is usually not a good idea. Chemicals often do not reach the clog and make the water hazardous for plunging. A flange plunger or toilet auger is the safer first step.

Why does water come up in my shower when I flush?

That usually means a blockage in the main drain or sewer line. Stop using water and contact a plumber.

Are flushable wipes safe for my plumbing?

Many plumbers advise against flushing any wipes, since they often do not break down like toilet paper and can cause clogs in home drains and public sewers.

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