Toilet Overflow Cleanup by Water Category

Stop the Water in the First Ten Seconds

If the bowl is rising and you just flushed, act fast. Lift the tank lid and push the flapper down at the bottom of the tank. That stops more water from entering the bowl. Then lift the float, the ball or cup that rises with the water, so the tank stops refilling.

Next, find the shutoff valve. It is usually on the wall or floor behind the toilet, a small oval or round handle on the supply line. Turn it clockwise until it stops. If it will not turn, do not force it with pliers, because old valves can snap. Shut off the main water valve for the house instead.

If water is spraying from the tank, the supply line or the fill valve, you have a clean water leak rather than an overflow. The shutoff still works the same way. A cracked tank or a split supply line needs replacement before you turn the water back on.

Know Which Water You Are Dealing With

Restoration pros sort water into three categories, and the category tells you how careful to be. A toilet can produce all three.

Time matters too. Clean water that sits for more than a day or two can grow bacteria and move up a category, especially in a warm house. Gray water that sits becomes more like sewage. The faster you clean, the more you can save.

If toilets or drains elsewhere in the house are also backing up, or the toilet overflows when the washer drains, the problem is in the main line rather than the toilet. That calls for a plumber and the sewage backup approach, not just a plunger.

Cleaning a Hard Floor

Most overflows land on tile or vinyl, and these clean up well if you work in the right order.

1. Remove the water. For tank water, towels or a wet-dry vacuum are fine. For bowl water, use old towels you are willing to throw away, or wash them separately in hot water.
2. Wash before you disinfect. Scrub with hot water and detergent. Disinfectants work poorly on surfaces that still have soil on them.
3. Disinfect. Apply an EPA registered disinfectant or a bleach solution and leave it wet for the full contact time printed on the label. The CDC suggests about 1 cup of bleach in 5 gallons of water for disinfecting hard surfaces after contamination.
4. Check the edges. Look along the baseboard, under the vanity and around the toilet base. Water runs to the lowest point.
5. Dry. Run the bath fan and a box fan for several hours, and leave the door open.

Wipe the outside of the toilet, the tank lid and the handle too. People touch those with dirty hands during the scramble.

Rugs, Bath Mats, Carpet and Walls

Bath mats and small rugs soaked by tank or bowl water can usually be machine washed in hot water with detergent. Add a laundry sanitizer or bleach if the fabric allows. If they got sewage on them, washing is possible for sturdy items, but most people simply throw them out.

Wall to wall carpet is harder. Carpet soaked by clean tank water can often be dried in place if you act within a day. Carpet soaked by bowl water needs cleaning and disinfection, and carpet and pad soaked by sewage are usually discarded, because the pad holds the contamination where you cannot reach it.

Drywall that wicked up water behind the toilet or vanity should be checked with a moisture meter. A small wet spot from clean water may dry with airflow. Drywall that wicked up sewage is normally cut out, at least 12 inches above the wet line, and replaced.

Wood vanities made of particleboard often swell and do not recover. Solid wood usually dries fine.

When Water Went Through the Floor

An upstairs overflow can travel through the subfloor and show up as a stain, a drip or a sagging patch in the ceiling below. This is the point where a small job can become a large one.

• A sagging ceiling can hold a lot of water and can fall. Keep people out from under it. If it is bulging, you can poke a small hole at the lowest point with a screwdriver while standing to the side, with a bucket below, to let water drain. Do not do this near a light fixture.
• If the ceiling has a light fixture or fan in the wet area, turn off that circuit at the breaker.
• If the water was bowl water or sewage, the ceiling drywall and insulation above it are contaminated and are usually removed.

Water under a toilet can also soak the subfloor around the flange for a long time before anyone notices. If the floor feels soft near the toilet, or the toilet rocks, the subfloor may be rotting. That needs a plumber or contractor to pull the toilet and look.

Clearing the Clog So It Does Not Happen Again

Once the mess is under control, clear the clog before you use the toilet again.

• Use a flange plunger, the kind with a soft rubber sleeve that folds out of the cup. It seals the drain opening better than a flat sink plunger. Push down gently the first time to push air out, then plunge firmly 10 to 15 times.
• If plunging fails, a closet auger reaches through the trap without scratching the porcelain.
• Skip chemical drain cleaners. They rarely clear a toilet clog, they can damage older pipes, and they make the water dangerous to anyone who has to plunge it later.

Common causes include too much paper at once, wipes labeled flushable, children’s toys and low flow toilets with a weak flush. If the toilet clogs often with normal use, or other drains gurgle when you flush, call a plumber to check the drain line and vent.

Step by Step

1. Stop the Flow

   Lift the tank lid and push the flapper closed, then lift the float. Turn the shutoff valve behind the toilet clockwise until it stops.

2. Protect Yourself

   Put on gloves before touching any water from the bowl. Add goggles if the water contains feces or you will be scrubbing near your face.

3. Decide the Category

   Tank or supply line water is clean. Bowl water without feces is gray. Anything with feces, or water coming up from the drain, is sewage.

4. Remove Standing Water

   Soak up water with old towels or a wet-dry vacuum for clean water. Bag towels used on bowl water or sewage, or wash them separately in hot water.

5. Wash the Floor

   Scrub the floor, baseboard and toilet base with hot water and detergent. Work from the cleanest area toward the dirtiest.

6. Disinfect Hard Surfaces

   Apply an EPA registered disinfectant or a bleach solution and leave it wet for the label contact time. Rinse if the label says to, then wipe dry.

7. Check Below and Behind

   Look at the ceiling in the room below and the wall behind the toilet. Press on the floor around the toilet base to feel for soft spots.

8. Dry the Room

   Run the bath fan and a box fan with the door open for several hours. Use a dehumidifier if carpet or walls got wet.

9. Clear the Clog

   Use a flange plunger, then a closet auger if needed. Test with one flush while your hand is ready on the shutoff valve.

Mistakes That Make It Worse

• Flushing again to see if it clears. A second flush sends another tank of water into a bowl that cannot drain.
• Pouring chemical drain cleaner into a clogged toilet. It rarely works and turns the bowl into a caustic splash hazard.
• Treating bowl water like clean water and wiping it up with bare hands.
• Ignoring a ceiling stain below the bathroom. Wet insulation and subfloor can stay damp for weeks and grow mold.
• Mixing bleach with toilet bowl cleaner, which can release chlorine gas.