Blocked Toilet? How to Unblock It (and When to Call a Plumber)

Quick answer: Stop flushing so it does not overflow, then try a flange plunger with firm, steady plunges for a minute or two. If that does not clear it, a mix of hot (not boiling) water and dish soap or a toilet auger usually will. If the toilet keeps blocking, more than one drain is slow, or water rises in the shower when you flush, stop and call a plumber — that points to a problem deeper in the line.

A blocked toilet is stressful, but most are cleared in a few minutes with the right approach. Here is how to do it safely.

First: stop it overflowing

If the bowl is filling, take the lid off the cistern and push the flapper down to stop more water entering. Do not flush again to “see if it clears” — that is how bathrooms flood.

Method 1: the plunger (start here)

Use a flange plunger (the type with a soft rubber sleeve that folds out), not a flat cup plunger.

1. Make sure there is enough water in the bowl to cover the plunger head.
2. Seat it over the outlet to form a seal.
3. Plunge with firm, steady pushes for 60–90 seconds.
4. Pull off sharply on the last push to break the blockage.

This clears the majority of everyday blockages.

Method 2: hot water and dish soap

If plunging alone does not do it, squirt a generous amount of dish soap into the bowl, then pour in hot (not boiling) water from waist height. Boiling water can crack porcelain, so keep it hot-tap warm. Wait 10–15 minutes for the soap to lubricate the blockage, then try the plunger again.

Method 3: a toilet auger

A toilet auger (closet auger) is a flexible cable that feeds around the bowl’s trap to reach a blockage a plunger cannot. Feed it in gently, crank to hook or break up the obstruction, then withdraw. They are inexpensive and worth owning if your toilet blocks often.

What NOT to do

• Avoid chemical drain cleaners. They rarely shift a true toilet blockage, can damage older pipes, and make it dangerous for a plumber to work on the line afterwards.
• Do not keep flushing. Repeated flushing on a blocked toilet causes overflows.
• Do not use a wire coat hanger as an auger — it scratches the porcelain and seldom reaches the blockage.

When to call a plumber

Stop the DIY and call a professional if:

• The toilet blocks repeatedly despite clearing it
• Other fixtures are affected — the shower gurgles or the basin drains slowly when you flush
• Water or sewage backs up elsewhere in the house
• You can smell sewer gas (see sewer smell outside the house)

These usually mean the blockage is in the main drain, not the toilet itself — often tree roots or a collapsed pipe. Repeated blockages are also a good reason to read up on preventing blocked drains.

How I clear stubborn blockages

When a plunger will not cut it, I use a CCTV drain camera to find exactly what and where the blockage is, then high-pressure water jetting to clear it properly — not just punch a hole through it. That way it stays clear.

I cover blocked drains and toilets across Melbourne’s eastern and south-eastern suburbs, including Cranbourne, Dandenong, Berwick, Frankston and Pakenham.

Toilet still blocked? Call 0407 756 172 — I can usually be there the same day.