Toilet overflowing?
Do this, in this order.
You have about thirty seconds before this becomes a floor problem. Read the four steps, do them, then come back for the rest.
Stop the water
- Do not flush again. Your instinct is to flush and hope. That adds another six litres to a bowl that can't drain, and it's what turns an overflow into a flood.
- Lift the cistern lid and push the flapper down. The flapper is the rubber seal at the bottom of the tank. Push it down with your hand and hold it. Water stops entering the bowl immediately. Yes, put your hand in — tank water is clean.
- Close the shut-off valve. Small oval or football-shaped tap on the wall behind or beside the toilet, near the floor, where the supply line goes in. Turn it clockwise until it stops.
- Now deal with the floor. Towels around the base, and get anything absorbent or valuable off the floor.
If the water still isn't stopping
If you've closed the valve and the bowl is still filling, the water isn't coming from your tank. It's coming back up from the drain, which means the blockage is downstream — in the branch line or the main sewer line.
That's a different and more serious problem, and it's not one you can fix from the bathroom. Check whether other drains in the house are gurgling, slow or backing up. If they are, it's the main line.
Stop using water anywhere in the house. No showers, no washing machine, no dishwasher. Everything you run has to go somewhere, and right now it's coming up through your lowest drain.
What not to do
- Don't pour chemical drain cleaner into a full bowl. It won't reach the clog through standing water, and you've now got caustic liquid in water that may end up on your floor — and on the hands of whoever works on it next.
- Don't use a sink plunger. The flat cup can't seal a toilet outlet. You need a flange plunger, the kind with a soft rubber sleeve that folds out from the cup.
- Don't reach in blind. If something was dropped in, fine. Otherwise you're risking a cut on porcelain you can't see.
- Don't keep plunging for twenty minutes. If six or eight firm attempts haven't moved it, it isn't a plunger problem.
Water on the floor right now?
One call connects you with a local plumber taking emergency work.
Call 1-877-916-1136 Free to call · 24 hours · No obligationOnce the water has stopped
You're no longer in an emergency, which means you can make better decisions. Bail the bowl down to about half full with a jug and a bucket — this gives a plunger room to work without splashing contaminated water around.
Then try a proper flange plunger. Insert it so the sleeve seats into the outlet, push down gently to expel air and establish a seal, then pull up sharply. The upstroke does the work, not the downstroke. Six to eight firm strokes.
When it needs a plumber
Call rather than keep trying if any of these apply:
| Sign | What it usually means |
|---|---|
| Other drains gurgle when you flush | Main line blockage or venting problem |
| More than one fixture backing up | Main line, not the toilet |
| Sewage smell through the house | Possible main line or vent failure |
| Water coming up in a shower or bath | Blockage downstream of both fixtures |
| It has happened repeatedly | Something structural — roots, a sag, or damage |
| Plunging has failed twice | Clog is beyond plunger reach |
The honest reason to stop early: a service call to clear a blockage is a known, bounded cost. Water damage to a subfloor is not. The gap between those two numbers is why plumbers get called at 2am rather than at 9am the next day.
Not urgent? Get a quote instead.
No active leak? Send your details and a local plumber will come back to you.
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