A tap that drips after you’ve turned it off isn’t being stubborn. A small part inside has worn down to the point where it can’t form a seal anymore, and the water pressure behind it does the rest.
The good news is that it’s a cheap part and a quick repair, as long as it’s caught before the dripping damages anything else inside the tap.
Most people live with it for months because it seems harmless. In Hurstville homes the taps are often the originals, and by the time someone calls, the drip has usually worn a second part as well, which is what turns a ten minute job into a bigger one.
How urgent is your sewer smell?
A faint smell from one drain may be less urgent if there are no other symptoms. A smell that returns, gurgles or appears with slow drainage is more likely to need inspection. The serious cases are the ones involving wastewater, outside gullies or several fixtures reacting together. This tool helps guide the next step, but it does not diagnose the drain.
What Causes a Sewer Smell Indoors?
Under every drain in your house is a U-shaped bend that holds a small amount of water. That water is the only thing standing between your bathroom and the sewer, and it works like a plug. Air from the drain can’t get past it. When a drain goes unused for weeks, that water slowly evaporates, the plug disappears and the smell comes straight up. The same thing happens when a drain is blocked, because the trapped waste sitting in the pipe gives off its own smell no matter how much water is in the bend.
1
Dry trap
The water in an unused drain evaporates and lets drain air up.
2
Buildup
Hair, soap and grime coat the pipe and give off their own smell.
3
Blockage
Waste sitting in the pipe can’t get away and the smell rises.
4
Tree roots
Roots break into older pipes and slow everything moving past.
5
Damaged pipe
A cracked pipe lets sewer air escape where it shouldn’t.
Signs the Smell Isn’t Just Dirt
Where the smell is, and when it shows up, tells you a lot about what’s causing it.
It comes back
You clean, it smells fresh, and two days later it’s back. Cleaning never fixes a drain problem.
Drains gurgle
Gurgling with the smell means air is being forced past something in the pipe.
Only one room
A smell in one bathroom or laundry usually points to a drain in that room.
It’s worse outside
If you can smell it outside near the drain grate too, the problem is further down the line.
Why unused drains matter
Guest bathrooms, laundry floor drains and ensuites in homes where only one shower gets used are the usual culprits. In warm weather the water in those bends can dry out in a few weeks. It’s also why the smell often appears after a holiday, when nothing has been run for days.
How we track down a drain smell
We check which rooms smell, when it’s worst and whether the drains gurgle or run slow. Timing matters, especially if it shows up after the house has been empty.
Step 01
Read the pattern
The first step is checking whether the smell comes from one drain, one room or several fixtures. Timing matters too, especially if odour appears after showers, flushing or washing.
What we look for
What we look for
- Which drains are affected
- Gurgling or slow flow
- Whether the smell keeps returning
Step 02
Match the cause
A dry bend is handled differently to a blockage or a cracked pipe. We match the method to what’s actually letting the air through.
Step 03
Confirm the source
Once it’s sorted, we check the drain runs clear and the smell has gone, so you’re not back to guessing in a fortnight.
- Source found
- Drain checked
- Cause explained
Method matched to cause
Odour depends on the cause
Where a smell keeps coming back after the simple fixes, a camera down the line shows exactly what’s going on inside the pipe.
- CCTV inspection
- High-pressure jetting
- Electric Eel
- Flex Shaft
What affects the cost?
A dry bend costs nothing to fix yourself. A smell caused by buildup or a blockage takes longer, and one caused by a damaged pipe takes longer again, because it has to be found before it can be fixed. Access to the drain and the age of the pipework both make a difference.
| Situation | Likely method | What affects the job |
|---|---|---|
| Smell from one drain | Clear and flush | Access and pipe condition |
| Smell with slow draining | Clear the drain line | Where the blockage sits |
| Smell keeps coming back | Camera inspection | Pipe condition and root damage |
| Smell in several rooms | Inspect the main line | How far along the problem is |
The one minute fix worth trying first
Find the drain nearest the smell, including any floor drain, and pour a jug of water slowly down it. That refills the bend and blocks the drain air again. If the smell is gone by the next day, that was it. Do the same for any drain you rarely use, and repeat it every few weeks.
Safe to try yourself
- Pour water down unused drains
- Run taps in spare bathrooms
- Note where the smell is strongest
- Check whether drains gurgle
Time to call a professional
- The smell returns after watering drains
- Drains gurgle along with the smell
- More than one room smells
- Water drains slowly as well
The bottom line
A returning smell has a cause
A smell that disappears with cleaning and comes back is telling you something in the drain system isn’t sealing. Often it’s a bend that’s dried out, which costs a jug of water to fix. When it isn’t, the smell is the early warning for a blockage or a damaged pipe, and those get worse on their own.
Remember this
A sewer smell isn’t a cleaning problem. It’s a sign that drain air is getting somewhere it shouldn’t.
Sewer Smell FAQs
Why does my bathroom smell like sewage?
Air is coming up out of a drain instead of being blocked by the water sitting in the bend below it. That water usually evaporates in drains nobody uses.
Why does it come back after cleaning?
Because cleaning only treats the surface. If the smell is coming from inside the drain, scrubbing the room makes no difference to it.
What is a drain trap?
It’s the curved section of pipe under every drain. It holds a little water at all times, and that water is what stops drain smells coming into the room.
Why does my laundry smell worse than the bathroom?
Laundry floor drains often go months without water. Once the bend dries out, there’s nothing left to block the smell.
Is a sewer smell dangerous?
It’s unpleasant rather than an emergency, but it shouldn’t be ignored. A smell that keeps returning usually means a blockage or a damaged pipe behind it.
Who fixes a sewer smell?
A licensed plumber. They’ll find which drain it’s coming from, deal with the cause rather than the smell and check it’s actually gone.
Smell keeps coming back? Let’s sort it out
Water Workx Plumbing looks after homes across Mortdale and the surrounding suburbs. We’ll find where the smell is coming from, explain it in plain English and give you a fixed price before any work starts. Call Peter and the team.
Contact Details
Please feel free to contact us with any questions and queries you might have. We are always happy to offer advice and FREE Quotes.
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