A badly blocked toilet is one of those household emergencies that needs sorting fast. The good news is that many blockages — even stubborn ones — can be cleared without calling a plumber, as long as you have the right tools and a bit of patience. Here's a practical, step-by-step guide to getting your toilet flowing again.
Safety First
Before you start, protect yourself. Toilet water can carry harmful bacteria, so always wear rubber gloves (ideally elbow-length), and consider safety glasses if you're plunging vigorously. Keep old towels or rags handy to mop up spills, and make sure the bathroom is well ventilated. Never mix chemical drain cleaners — the fumes can be dangerous. WorkSafe NZ has general guidance on handling hazardous household substances safely.
Step 1 — Stop the Toilet Overflowing
If the bowl is full to the brim, do not flush again. Remove the lid from the cistern and push the flapper valve (the rubber seal at the bottom of the cistern) down by hand to stop more water entering the bowl. This buys you time to work without a flood on your bathroom floor.
Step 2 — Gather Your Tools
Having the right gear makes a huge difference. Here's what you'll want:
| Tool | Why It Helps |
|---|---|
| Toilet plunger (flange type) | The rubber flange fits the toilet outlet for a proper seal — far more effective than a flat cup plunger |
| Toilet auger (drain snake) | A flexible cable that reaches deeper blockages the plunger can't shift |
| Rubber gloves | Hygiene and protection |
| Bucket | For bailing excess water if the bowl is too full |
| Old towels / plastic sheeting | Protect the floor |
A good flange plunger and a toilet auger are available from Bunnings or Mitre 10. Avoid cheap flat plungers — they rarely create enough suction on a toilet outlet.
Step 3 — Try the Plunger First
- If the water level is very high, bail some out into a bucket so the bowl is roughly half full.
- Warm the rubber plunger cup briefly under hot tap water — this softens it and improves the seal.
- Insert the flange into the toilet outlet at the bottom of the bowl and press down firmly to create a seal.
- Push and pull with firm, steady strokes — about 15–20 pumps — keeping the seal intact. The pulling stroke is just as important as the push.
- On the final stroke, pull the plunger away sharply to break the seal. This sudden pressure change often dislodges the blockage.
- Flush to test. Repeat 3–4 times if needed before moving on.
Step 4 — Use a Toilet Auger for Stubborn Blockages
If plunging hasn't worked after several attempts, a toilet auger (also called a closet auger or drain snake) is your next move. This is a flexible metal cable with a protective rubber sleeve that won't scratch the porcelain.
- Insert the curved end of the auger into the toilet outlet.
- Crank the handle clockwise while gently pushing the cable further into the drain.
- When you feel resistance, you've hit the blockage — keep cranking to either break it up or hook it so you can pull it out.
- Slowly retract the cable, then flush to test.
Augers can reach blockages 60–90 cm into the drain — well past where a plunger can reach.
Step 5 — Hot Water and Dish Soap (Gentle Method)
For softer blockages (organic matter, too much toilet paper), this old trick sometimes works on its own or alongside plunging:
- Squirt a generous amount of dish soap into the bowl.
- Pour in a bucket of hot (not boiling) water from waist height — the force and heat help shift the blockage.
- Wait 10–15 minutes, then try flushing.
Avoid boiling water — it can crack porcelain.
What About Chemical Drain Cleaners?
Be cautious. Most standard drain cleaners are formulated for sink and shower drains, not toilets. Some can damage rubber seals and older ceramic. If you do use one, choose a product specifically labelled safe for toilets and follow the manufacturer's instructions exactly. They work best on organic blockages and are useless against solid objects.
Common Causes of Toilet Blockages in NZ Homes
- Excess toilet paper (especially thick or "quilted" types)
- Wet wipes — even those labelled "flushable" are a major cause of blockages and should go in the bin
- Children's toys or other foreign objects
- Build-up in older cast-iron or clay drain pipes (common in pre-1980s NZ homes)
- Tree root intrusion into outdoor drain lines
When to Call a Professional
Some blockages are beyond DIY — and attempting to force them can cause damage or make things worse. Call a licensed plumber if:
- The toilet is still blocked after multiple attempts with a plunger and auger
- Multiple fixtures (e.g. toilet, shower, and basin) are draining slowly or backing up at the same time — this suggests a main drain blockage
- You suspect a foreign object (toy, sanitary product) is lodged deep in the drain
- There is sewage backing up into other fixtures
- You notice gurgling sounds from other drains when you flush
- The blockage is in an outdoor drain or the main sewer line
Main drain and sewer line work often requires a CCTV drain inspection and high-pressure water jetting — specialist equipment that only a licensed plumber or drainlayer will have. Under the Plumbers, Gasfitters and Drainlayers Act, certain drainlaying work is restricted and must be carried out by a licensed tradesperson. You can find a qualified local plumber on tradedirectory.co.nz.