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Common Signs of a Blocked Drain
Drain blockages rarely happen overnight. In many cases, there are warning signs that indicate a blockage is beginning to form.
Some of the most common symptoms include:
- Water draining more slowly than usual
- Gurgling sounds from sinks, showers or toilets
- Unpleasant odours coming from drains
- Water backing up into sinks, showers or floor drains
- Toilets that flush poorly or overflow
- Pools of water forming around outdoor drains
If more than one fixture is affected at the same time, the blockage may be deeper within the plumbing system or even in the main sewer line.
What Causes Blocked Drains?
Almost anything that restricts the flow of water through your pipes can cause a blocked drain. The exact cause often depends on the location of the blockage and the type of plumbing system.
Some of the most common causes include:
Kitchen drains
Kitchen sinks often become blocked by grease, cooking oils, food scraps and coffee grounds. While hot water may temporarily wash grease away, it can solidify further down the pipe and gradually restrict water flow.
Bathroom drains
Hair, soap residue and personal care products commonly build up in bathroom pipes, creating stubborn clogs over time.
Toilets
Flushing items such as wet wipes, paper towels, sanitary products or excessive toilet paper can result in a clogged drain or even a blocked sewer if the obstruction travels further into the system.
Outdoor drains
Leaves, dirt, tree roots and storm debris are frequent causes of blocked outdoor drains. Tree roots are particularly problematic because they naturally seek out moisture and can grow into small cracks in underground pipes.
Can You Clear a Blocked Drain Yourself?
Some minor drain clogs can be cleared using simple methods such as a plunger or by manually removing visible debris from the drain opening.
However, recurring blockages often indicate a larger problem further inside the pipe. Chemical drain cleaners may seem like a quick solution, but frequent use can damage certain pipe materials and won't address the underlying cause if the blockage is caused by tree roots, collapsed pipes or heavy build-up.
If the blockage keeps returning, it's usually a sign that further investigation is needed.
How Plumbers Diagnose Blocked Drains
Professional plumbers use specialised equipment to locate and remove blockages without unnecessary guesswork.
Depending on the situation, this may include:
- CCTV drain cameras to inspect the inside of pipes
- High-pressure water jetting to remove grease, sludge and debris
- Mechanical drain snakes or augers for stubborn obstructions
If the inspection reveals cracked or damaged pipes, solutions such as pipe relining may be recommended. Pipe relining repairs the inside of an existing pipe, often avoiding the need for extensive excavation.
When Is a Blocked Drain an Emergency?
While many drainage issues can wait for a scheduled appointment, some situations require immediate attention.
Contact a plumber as soon as possible if you notice:
- Sewage backing up into your home or business
- Overflowing toilets that cannot be cleared
- Multiple blocked drains throughout the property
- Strong sewage odours inside the building
- Water pooling around internal floor drains
These symptoms may indicate a blocked sewer or a significant obstruction affecting the property's drainage system.
How to Help Prevent Blocked Drains
Good habits can significantly reduce the likelihood of future blockages.
Some simple preventative measures include:
- Avoid pouring fats, oils and grease down the sink.
- Use drain strainers to catch hair and food scraps.
- Only flush toilet paper down toilets.
- Regularly clear leaves and debris from outdoor drains.
- Arrange routine drain inspections if your property has older plumbing or large trees nearby.
Preventative maintenance is often much less expensive than repairing damage caused by a major blockage.
Finding the Right Help
If a blocked drain can't be cleared with simple measures or keeps returning, it's worth having the system professionally inspected. Identifying the cause early can prevent further damage and help avoid more extensive repairs in the future.
If you're looking for a local blocked drain plumber, Belong can connect you with vetted professionals so you can compare quotes and find the right expert for the job.
For more plumbing advice, visit our Plumbing Hub, explore our Blocked Drain Cost Guide, or browse our other plumbing how-to resources.
What a Blocked Drains Tradie Will Do
- CCTV drain cameras to inspect the inside of pipes
- High-pressure water jetting to remove grease, sludge and debris
- Mechanical drain snakes or augers for stubborn obstructions
- Pipe relining to repair the inside of an existing pipe
Typical Cost
Estimated Range
From $100 to $300 for simple blockages
This is a rough estimate. Your actual cost will depend on the size of the job, materials chosen, and your property's specific needs.
View full cost guide
Customer Reviews
“The plumber used a camera and found tree roots. Jetted it clear in under an hour. Great service.”
“Had a slow draining shower for months, they finally fixed it completely. Very tidy.”
“Professional and upfront about costs. Unblocked my kitchen sink quickly.”
Frequently Asked Questions
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Tree Roots in Pipes: What You Need to Know
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