7 Signs You Have a Blocked Drain

Blocked drains don't really happen overnight. It's more of a gradual thing — stuff builds up inside the pipe bit by bit, and that's exactly why people tend to miss the early signs or just put it down to a minor annoyance. The good news is that sorting it out early makes the whole job easier and cheaper. Once you're dealing with a proper backup though, it gets messier, more of a disruption, and you're paying more for the privilege.

1. Water drains slowly

For most people, this is the first thing they notice. The kitchen sink starts taking longer to empty, or the shower tray fills up round your ankles a bit before the water finally goes down. Hair, soap residue, grease and bits of food are usually what's building up in there. If it's just one drain acting funny, that's normally a localised issue. Two or three fixtures all draining slow at the same time is a different story — that points to the problem being further down the main line.

2. Gurgling sounds

You flush the toilet or run the tap and hear this gurgling from the plughole. That sound is air being pushed back up through the water by a partial blockage somewhere further along. People shrug it off all the time, but it almost never sorts itself out on its own. Think of it as the drain giving you a nudge — better to deal with it now before the whole thing packs in.

3. Bad smells

A foul smell, something rotten or sewage-ish, hanging around a drain, a sink or even outside near a gully. What's happening is waste is sitting there in the pipe, not getting washed away. Food scraps, grease and other organic material decompose and the stink comes back up through the drain. Give the plughole a decent clean first — if the smell's still there after that, the source is further down the line.

4. Water pooling or backing up

You run the basin tap and water starts rising in the shower tray. Or you use one fixture and water surfaces somewhere completely different. That's a fairly strong indicator of a shared blockage further downstream. Wastewater has to go somewhere, and when it can't get through, it finds the lowest open exit — which is why a blocked main line sometimes shows up as water appearing in a spot you'd never expect.

5. A toilet that won't flush properly

Your toilet clears sluggishly, the water level creeps up higher than it should before it drops, or you notice bubbles when you flush. The blockage could be sitting in the toilet trap or further along in the sewer line. Honestly, a toilet backing up is something you want to take seriously — it's the fixture most likely to end in an unhygienic, messy overflow right inside your home.

6. Overflowing drains or gully traps

An outdoor gully or drain overflowing, especially with dark and smelly water, tells you the main line is fairly seriously blocked. Wastewater is escaping wherever it can first find an opening. This one is often the last warning you get before the backup comes indoors, so it's worth getting a plumber out pretty quickly. Our blocked drains service can get it cleared before it reaches your floors.

7. Recurring blockages in the same spot

Same drain, keeps blocking no matter what you throw at it? There's usually something structural going on — a bit of a collapse, scale build-up inside the pipe, or tree roots that have found their way in. Plunging really only clears the symptom for a while. A CCTV drain inspection will show you exactly what the problem is so it can actually be fixed, not just temporarily shifted.

Should you worry about a single slow drain?

Not necessarily, though you shouldn't just ignore it completely either. One drain going slow in a basin or shower is usually a local build-up, and there's a decent chance you can sort it yourself — it's also a good excuse to give that drain a bit of attention before things escalate. What actually matters is the pattern. If several fixtures slow down together, if the toilet's getting involved, or if smells and gurgling turn up alongside the slow drainage, then the problem is probably deeper in the main line. At that stage you want a professional to have a look. The real difference between a minor nuisance and a genuine warning sign is pretty much how many of these signs are showing up at the same time.

What causes blocked drains?

Most household blockages come from a pretty short list of culprits:

• Hair and soap scum in showers and basins

• Fat, oil and grease tipped down the kitchen sink, which cools and hardens as it goes

• Food scraps and coffee grounds

• Wet wipes and sanitary items — even the ones labelled "flushable" don't break down the way toilet paper does

• Tree roots going hunting for moisture in older or cracked pipes

• Foreign objects — toys, cotton buds, dental floss, that kind of thing

Can you clear a blocked drain yourself?

Sometimes, yeah. A plunger can sort a lot of minor blockages out, or even just hot water with a squirt of dish soap if it's a kitchen or basin issue. A drain snake lets you get a bit further in. What you should avoid are chemical drain cleaners — they can damage your pipes, they're nasty to handle, and half the time they just shove the problem further down the line instead of actually removing it. If the blockage keeps coming back, if it's affecting more than one fixture, or if it's the toilet or the main line involved, that's when you bring in someone with the right equipment like a drain camera and a hydro jetter.

The thing a licensed plumber actually brings to the table isn't just raw clearing power — it's working out what's really going on. A hydro jetter cleans the pipe walls with high-pressure water instead of just poking a hole through whatever's blocking it, so it's much less likely to recur. Couple that with a CCTV camera and the plumber can see exactly what caused the blockage and whether the pipe itself is damaged. That turns what felt like a repeating problem into a one-off repair.

When to call a plumber

You want a licensed plumber if multiple drains are slow at the same time, if there's sewage smells or actual backups, if an outside gully is overflowing, or if a blockage keeps coming back no matter how many times you clear it. Those signs point to something going on in the main line that needs proper diagnosis. Figuring out how to prevent blocked drains in the first place will save you a fair bit of hassle further down the track.

Got a drain that's slow, smelly or backing up? Call our licensed Canning Vale plumbers and we'll clear it properly.

Frequently asked questions