Quick Answer
A blocked drain usually gives you plenty of warning. Water drains slower than it used to, the plughole gurgles, a sewer smell hangs around the bathroom or laundry, or water rises in the shower when someone flushes the toilet. One slow drain on its own usually means a blockage close to that fixture. Several drains playing up at once, or wastewater spilling out of the grated pipe outside your house, points to a blocked main line, and that one definitely needs a licensed plumber the same day. On the Sunshine Coast, the usual culprits are tree roots, fat and grease, wet wipes and older pipes that have cracked or shifted, and wet weather tends to make every one of them worse.
Why Blocked Drains Sneak Up on You
Drains almost never go from perfectly fine to completely blocked overnight. Grease coats the inside of a pipe a thin layer at a time. A root finds a hairline gap in an old joint and keeps growing. Wipes catch on that build-up, and then everything else catches on the wipes. Unitywater, which runs the sewer network across the Sunshine Coast and Noosa, makes the same point in its own guidance: blockages generally start well before anyone notices them, and get steadily worse.
That slow build is the reason the early signs matter. A blockage caught while the shower's just draining a bit sluggishly is a far smaller job, and a far smaller bill, than one discovered when wastewater is coming up through the floor grate.
Signs You Have a Blocked Drain
Water drains slowly, then slower
A basin or shower that takes a little longer to empty each week is the most common early sign. Most people put it down to an older house or think they can wait it out and see. Usually it's build-up narrowing the pipe.
Gurgling from the plughole or toilet
That glugging noise after you pull the plug is air being forced back up because water can't get past something further down. Gurgling from the toilet when the shower or washing machine drains is a particularly strong hint that the problem is in a shared line.
A smell that won't go away
A sewer smell in the bathroom, laundry or yard that keeps coming back after you've cleaned is worth taking seriously. Trapped waste sitting in a partially blocked pipe tends to announce itself this way.
Water turning up where it shouldn't
If water rises in the shower base when the toilet flushes, or the laundry tub bubbles when the washing machine empties, wastewater is looking for another way out because its normal path is blocked.
More than one fixture playing up at once
This is the big one. One slow basin is usually a local problem. The shower, toilet and laundry all struggling at the same time usually means the main drain carrying everything to the sewer is blocked.
Your overflow relief gully is overflowing
Most homes connected to sewer have an overflow relief gully (ORG): a small pipe with a loose grate, sitting just above ground level outside, usually near the bathroom or laundry. It's designed as a release point. If the sewer line blocks, wastewater should spill out of the ORG outside rather than backing up through your shower or floor waste inside. If you ever see yours overflowing, the sewer line is blocked and it's time to call a plumber straight away. Unitywater's advice is to keep the ORG clear and uncovered, so it can do its job, which means no pot plants, pavers or garden beds on top of it.
Soggy patches or suspiciously green grass
A patch of lawn over your sewer line that's always damp, or noticeably greener than everywhere else, can point to a cracked or broken pipe leaking underground. It's worth having looked at before it becomes a blockage, or worse.
One Slow Drain vs Every Drain: What It Tells You
Think of your drains as branches feeding into one trunk. Each fixture (basin, shower, toilet, laundry tub, kitchen sink) has its own short branch, and those branches join up into the main line that runs out to the sewer connection.
When a single branch blocks, only that fixture misbehaves. Hair and soap in a bathroom basin, or grease and food scraps in a kitchen sink, are the classic examples. It's annoying, and it should still be looked at, but wastewater has other places to go.
When the trunk blocks, everything upstream of the blockage backs up together, and the lowest fixtures in the house (often the shower or floor waste) are where it shows first. That's the scenario that turns into an emergency, because wastewater has nowhere to go but back inside.
What Causes Blocked Drains on the Sunshine Coast
Tree roots
Roots go looking for water, and a sewer pipe is a reliable supply of it. They work their way in through old joints and small cracks, then keep growing inside the pipe until very little can get past. Established Sunshine Coast yards with big trees near the sewer line are prime territory, and root intrusion tends to come back after a basic clear-out if the cause isn't dealt with properly. Unitywater recommends never planting trees over or around sewer lines for exactly this reason.
Fat, oil and grease
Pan drippings go down the sink as a liquid and set solid once they cool inside the pipe. Each layer gives the next one something to stick to, and coffee grounds and food scraps bind into it. Kitchen drain blockages are very often years of this in the making.
Wet wipes and things that aren't toilet paper
Unitywater's rule for toilets is simple: only the three Ps go down (pee, poo and toilet paper). It specifically warns that wet wipes aren't flushable even when the packaging says they are, and lists cotton buds, nappies and sanitary products among the things that belong in the bin.
Hair, soap and everyday build-up
Bathroom drains collect hair and soap scum steadily. On their own they usually cause a slow basin or shower. Combined with an older, narrower or rougher pipe, they can cause a full blockage.
Ageing, cracked or shifted pipes
Older pipes crack, joints separate, and ground movement can cause a section of pipe to sag or collapse. Any of those creates a spot where waste collects, and a sagging section can keep blocking no matter how many times it's cleared.
Stormwater getting into the sewer
The stormwater system and the sewer are two separate networks and aren't meant to mix. During heavy rain, stormwater can still get into the sewer through incorrectly connected downpipes or cracked pipes, and Unitywater notes that storms and heavy wet weather can overload the network and cause wastewater overflows, including on private property. It's also illegal to connect a stormwater pipe to the sewer, and if one is found, the homeowner needs a licensed plumber to fix it. With storm season on its way, it's a good time to make sure your property isn't adding to the problem.
Is It Your Pipe or Unitywater's?
This is one of the most useful things to know before you pick up the phone. On the Sunshine Coast, Unitywater's position is that the property owner is responsible for all the pipework and plumbing fixtures on their own property, along with any blockages in them. Pipes on public land, such as under the footpath or road, are Unitywater's responsibility.
So a blockage in your yard is a job for a licensed plumber, and the cost sits with the property owner. A blockage on Unitywater's side of the boundary is theirs to fix. Working out which side the problem is on is part of the job when a plumber attends, and a CCTV drain camera makes that far more precise than guessing.
For property managers and body corporates, this distinction matters on every callout. Knowing where the blockage sits before anyone starts digging keeps the right party paying for the right work.
When to Call a Plumber, and How Fast
Call straight away, day or night
- Wastewater or sewage coming up through a shower, floor waste, bath or toilet
- Your ORG overflowing outside
- Several fixtures blocked or backing up at once
- Your only toilet is blocked
- Wastewater pooling in the yard with a sewage smell
Book in this week
- A single drain that's slow and getting slower
- Gurgling or smells that keep coming back
- A drain that has blocked again after being cleared before
- Big trees near your sewer line and a history of slow drains
Why This Guide Doesn't Include "Try This First"
You might notice there's no list here of things to try yourself before calling someone. That's deliberate. Once a drain is showing signs of a blockage, the quickest and cheapest path is finding out exactly what's in the pipe and where, and that's work for a licensed plumber. Plumbing and drainage requirements can vary between council areas, and a well-meaning hardware-store fix can push a blockage further down the line, or clear just enough to hide the real cause until it comes back worse.
Where you can make a real difference is in what goes into your drains in the first place. Scrape plates and pans into the bin or compost, let cooking fat cool and bin it, put wipes and everything other than toilet paper in the bin, and keep your ORG uncovered. Those habits cost nothing and take a lot of pressure off your pipes.
What Happens When RK Plumbing & Gas Comes Out for a Blocked Drain
Every blocked drain job starts with finding out what's actually going on. Here's how Riley and the team work through it:
Find the cause. A CCTV drain camera goes into the pipe so we can see exactly what's causing the problem, whether that's roots, grease, a foreign object, or a cracked or collapsed section, without digging up your yard to find out.
Clear it properly. High-pressure water jetting scours roots, grease and build-up from the pipe along its length, giving the drain its full diameter back.
Fix what caused it. Where the camera shows damage, we can repair or reline the affected section, remove root intrusion, or replace the drain where that's genuinely the better option.
Keep it clear. For properties with recurring problems, such as big trees near the line or a rental that keeps generating the same callout, we offer drain maintenance plans with regular inspections and cleaning.
You'll get an itemised quote before any work starts, with no hidden fees and no unnecessary upselling. If the camera shows the problem is on Unitywater's side of the boundary, we'll tell you that too.
Frequently Asked Questions
Is a blocked drain an emergency? It depends on what it's doing. Wastewater coming up inside the house, an overflowing ORG, several fixtures blocked at once or your only toilet out of action all need a plumber that day, and RK Plumbing & Gas is available 24/7 for exactly those situations. A single slow drain isn't an emergency, but it's worth booking in before it becomes one.
Will Unitywater fix my blocked drain? Only if the blockage is in their pipes, which are the ones on public land. Unitywater's guidance is that pipes and fixtures on private property, and blockages in them, are the property owner's responsibility. A licensed plumber can work out which side of the boundary the blockage is on.
Why does my drain keep blocking after it's been cleared? Usually because the cause is still there. Tree roots, a sagging section of pipe or years of built-up grease can all let a drain run for a while after a basic clear before blocking again. A CCTV inspection shows what's causing it so the fix goes after whatever keeps causing it.
Can "flushable" wipes really block a drain? Yes. Unitywater states plainly that wet wipes aren't flushable, even when the packaging says they are. They belong in the bin, along with cotton buds, nappies and sanitary products.
How much does it cost to clear a blocked drain? It depends on where the blockage is, what's causing it, and whether the pipe needs repairing once it's cleared. That's exactly why we quote after looking at the problem. You'll get an itemised quote before we start, so you know what you're paying for.
Which areas do you cover for blocked drains? RK Plumbing & Gas is based in Caloundra and covers the Sunshine Coast from Noosa to Caloundra, including Maroochydore, Nambour and the suburbs in between.
Blocked Drain? Get It Sorted Properly
If your drains are gurgling, smelling or backing up, the sooner someone finds the cause, the smaller the job tends to be. RK Plumbing & Gas is QBCC licensed, fully insured and rated 5 stars across 150+ Google reviews, with a CCTV drain camera and high-pressure jetting equipment ready to go. Call 0421 322 141 (24/7, including weekends and public holidays), book online, or get a free quote.
