A blocked drain rarely happens without warning. It might start with a sink that drains a little slower than usual, a toilet that gurgles after flushing or an unpleasant smell coming from a floor waste.
It’s easy to pass off these issues as minor at first, but don’t be too quick to dismiss it. In many cases, they often indicate a blockage that will only become worse over time.
Unfortunately, many homeowners wait until water starts backing up or overflowing before calling a plumber. By this point, the problem has become more complex, more disruptive and more expensive to repair.
In this guide, we’ll discuss what causes blocked drains and how recognising the warning signs early can save you significant time, money and stress.
The Early Warning Signs of a Blocked Drain
Blocked drains rarely happen without warning, so understanding the early signs can help prevent costly repairs.
Slow-draining sinks or showers often indicate a developing blockage, while gurgling sounds from toilets, basins or drains can signal trapped air caused by restricted pipes.
Persistent unpleasant odours may mean wastewater isn’t flowing properly, especially if smells remain after cleaning.
If multiple fixtures are affected at once, such as the toilet bubbling when the washing machine drains or water backing up into the shower after flushing, the blockage is likely in the main sewer line.
Outside, pooling water around stormwater pits, downpipes or drains after rain can also point to a blockage that should be addressed before it causes flooding.
Why Do Drains Become Blocked?
Drains are designed to carry wastewater away from your property, but over time materials can build up inside the pipework and restrict the flow of water.
Sometimes the blockage develops gradually over months, while other times it can occur suddenly after heavy rainfall or something unsuitable is flushed down the toilet.
Tree Root Intrusion
One of the most common causes of blocked drains in Melbourne is tree root intrusion. Many older suburbs still have clay sewer pipes with joints that naturally weaken over time.
Tree roots are attracted to the moisture inside these pipes and can force their way through tiny gaps.
Once inside, they continue growing, eventually trapping toilet paper, grease and other debris until the pipe becomes completely blocked.
Food Scraps, Fats, Oils and Grease
Kitchen drains become blocked by a gradual build of grease, oils, fats and food scraps. Although cooking oil may appear harmless when poured down the sink, it cools and solidifies inside the pipework.
Animal fats such as beef tallow and lard and plant based oils like coconut and olive oil are some of the biggest culprits.
Over time this sticky layer collects additional debris and gradually narrows the pipe until water can no longer flow freely.
Soap Residue and Bathroom Waste
Bathroom drains develop their own type of blockage. Hair, soap residue, shampoo and general bathroom waste slowly accumulate, particularly around bends in the pipe.
Even with regularly cleaning, the chemicals you use to wash your bathroom don’t always break down the materials hidden inside the pipes.
While these blockages usually develop more slowly than tree root problems, they can still lead to complete drainage failure if left untreated.
Wet wipes and non-flushable products
Toilets are another common source of drainage issues. There’s a good reason why plumbers say not to flush wet wipes down the toilet as they do not break down.
Even products marketed as “flushable” often fail to break down properly and can contribute to significant sewer obstructions.
Other culprits such as paper towels, sanitary products, nappies and children’s toys are regularly responsible for serious blockages.
Heavy Rainfall
Melbourne’s unpredictable weather also plays a role. Heavy rainfall, particularly in summer can overwhelm stormwater systems, washing leaves, silt and garden debris into drains and causing blockages that prevent water from flowing away effectively.
As stated by the Yarra City Council, “As our cities become more densely developed, rainwater also flows faster off hard surfaces like concrete, instead of filtering into soils. This can increase flooding along waterways and low-lying land”. Source: (https://www.yarracity.vic.gov.au/about-us/news-and-media/melbourne-water-releases-updated-flood-mapping-yarra)
Why DIY Drain Clearing Often Doesn’t Solve the Problem
Many people reach for chemical drain cleaners or a basic plunger as soon as a drain slows down. While these methods can occasionally clear minor surface obstructions, they rarely remove the underlying cause of the problem.
Chemical drain cleaners may temporarily improve water flow, but they can also damage older pipework and are generally ineffective against tree roots or significant grease build-up. Plungers too, often push a blockage slightly further along the pipe rather than removing it completely.
Drain snakes and handheld augers may punch a small hole through the obstruction, allowing water to flow again temporarily. However, the remaining debris usually stays inside the pipe and quickly causes another blockage.
This is why recurring blocked drains are so common. Unless the entire obstruction is removed and the pipe inspected, the problem simply returns.
How Professional Drain Clearing Works
Professional plumbers like the team here at Around Town Plumbers use specialised equipment designed to identify the exact cause of the blockage before beginning any cleaning work.
The process starts with a CCTV drain camera inspection. A small waterproof camera is carefully fed through the pipe, providing a live view of the drainage system. This allows our plumbers to locate the blockage precisely while identifying whether tree roots, grease, pipe damage or another issue is responsible.
Using a drain camera removes the guesswork from the job. Rather than attempting different clearing methods blindly, the plumber knows exactly where the obstruction is located and what equipment will produce the best result.
Once the blockage has been identified, high-pressure water jetting is commonly used to clear the drain.
Why High-Pressure Water Jetting Is So Effective
Unlike traditional drain rods or handheld snakes, high-pressure water jetting removes the blockage while also cleaning the inside of the pipe.
A specialised hose delivers water at extremely high pressure, cutting through tree roots, grease, sludge and accumulated debris.
Rather than just punching a hole through the blockage, the water scours the entire internal surface of the pipe, leaving it much cleaner and reducing the likelihood of another blockage developing soon afterwards.
High-pressure jetting is effective across residential, commercial and industrial drainage systems and is particularly useful for removing stubborn root intrusion from older sewer lines.
Once the drain has been cleared, another CCTV inspection is usually carried out to confirm the blockage has been completely removed and to identify any structural damage that may require repair.
When a Blocked Drain Is Actually a Broken Pipe
Sometimes the blockage itself isn’t the main problem.
A CCTV inspection may reveal cracked, collapsed or sagging pipework that repeatedly catches debris. In these situations, simply clearing the blockage provides only a temporary solution because the damaged section will continue causing problems.
Identifying structural defects early allows repairs to be planned before the issue develops into a major excavation or emergency plumbing situation.
Sewer Drains and Stormwater Drains Are Different Systems
Many property owners assume all underground drains work the same way, but sewer and stormwater systems perform very different functions.
Your sewer system carries wastewater from toilets, sinks, showers, laundries and other household plumbing fixtures. These pipes commonly become blocked by tree roots, grease, wipes and foreign objects.
Stormwater drains, on the other hand, collect rainwater from roofs, gutters, driveways and paved areas. They typically become blocked by leaves, soil, branches and other outdoor debris, particularly during Melbourne’s wetter months.
Correctly identifying which system is blocked is an important part of diagnosing the problem and selecting the most effective repair method.
Preventing Future Drain Blockages
While not every drain blockage can be prevented, good habits significantly reduce the likelihood of recurring problems.
Avoid pouring cooking fats or oils down the kitchen sink, as they harden inside the pipework over time. Dispose of grease in a sealed container instead.
Only flush toilet paper down the toilet. Wet wipes, sanitary products, paper towels and other household items should always be placed in the rubbish, even if the packaging claims they are flushable.
Around the outside of the property, keeping gutters, grates and stormwater pits free from leaves and garden debris helps maintain proper water flow during heavy rain.
Properties with mature trees may also benefit from periodic CCTV inspections, particularly if previous root intrusion has occurred. Detecting roots early often allows them to be removed before they cause a complete blockage.
When Should You Call a Professional Plumber?
Some minor drainage issues may appear manageable initially, but recurring blockages nearly always indicate a larger underlying problem.
If multiple fixtures are backing up, sewage is overflowing, unpleasant smells continue to return or outdoor drains regularly overflow after rainfall, professional assistance should be arranged as soon as possible.
Ignoring these symptoms often allows the blockage to worsen, increasing the likelihood of pipe damage, internal flooding and more extensive repairs. Speak to Around Town Plumbing as soon as you notice the first sign of a plumbing issue.
Professional Blocked Drain Services Across Melbourne
Blocked drains are one of the most common plumbing problems affecting both homes and commercial properties throughout Melbourne. While many issues start off as minor inconveniences, they rarely resolve themselves without professional intervention.
Whether the problem is caused by tree roots, grease build-up, stormwater debris or damaged pipework, having the drain properly inspected and cleared helps restore your plumbing system while reducing the risk of future blockages.
If you’re experiencing blocked drains around Melbourne’s CBD and surrounding suburbs, get in touch with Around Town Plumbing today on 03 7023 5494. We’re committed to unmatched quality, ensuring every job meets superior standards.
