As we move into the next few months, the broader weather outlook is worth paying attention to, especially if you want to stay ahead of plumbing issues before they turn into expensive repairs.
According to the Bureau of Meteorology, the current outlook for April to June and May to July points to an ENSO-neutral pattern for now, with the tropical Pacific expected to keep warming in coming months. The Bureau’s latest long-range forecast also says rainfall is likely to be below average across much of eastern Australia, while daytime and overnight temperatures are likely to be above average across much of the country. The Bureau also notes that warmer ocean temperatures can add moisture and energy to storm systems, which means a drier overall pattern does not rule out sharp rain events when storms do develop.
For Brisbane and south-east Queensland, that means the next few months are less about constant wet weather and more about a mix of warmer conditions, patchier rainfall, and the possibility of intense bursts of rain when the weather does turn. That combination can create very specific plumbing risks around older drains, sewer lines, stormwater systems and overflow points.
1. Tree roots and hidden drain blockages
One of the biggest things to watch for over the coming months is tree root intrusion. Utilities note that tree roots enter pipes through small cracks or joints while searching for water, and once inside they keep growing, damaging the pipe and creating blockages. Sydney Water’s annual environmental report is even more direct: during dry weather, dry soil conditions can drive tree roots to seek moisture through pipes, causing blockages that often result in dry-weather overflows.
This matters because the current outlook leans warmer and broadly drier across eastern Australia. If you have older earthenware pipes, mature trees near the sewer line, or you have had a blockage before, the next few months are exactly the kind of period where the problem can quietly get worse underground before you notice it inside the home.
The warning signs are usually fairly obvious once they start: slow-draining sinks, showers or baths, gurgling toilets, poor flushing, or an overflow at the inspection opening or overflow relief gully.
2. Slow drains after rain
Even if the season overall is not forecast to be especially wet, heavy rain events can still expose weaknesses in your plumbing. Councils across Queensland warn that when stormwater enters the sewer network, it can overload the system and contribute to surcharging, overflows and sluggish drainage.
That means if your toilets start gurgling, your drains become slow after rain, or wastewater appears around your overflow point during wet weather, it may not just be “one of those things”. It can be a sign that stormwater is getting where it should not, or that an existing blockage is being made worse when the system is under pressure.
3. Overflow relief gullies that are buried, blocked or taking in stormwater
A lot of homeowners do not think about their overflow relief gully until there is a mess in the yard. But these fittings are there for a reason. Councils warn that heavy rainfall can overload the sewer network, especially when stormwater enters through private plumbing faults, and that a properly installed ORG helps protect the home by giving sewage a controlled outlet point instead of letting it back up inside.
Problems start when the ORG is buried under landscaping, covered by pots or garden beds, set at the wrong height, or mistaken for a drain and allowed to collect stormwater. Queensland councils specifically warn that ORGs should not take stormwater, and that downpipes or landscape drainage should not be connected into the sewer system.
Over the next few months, it is worth physically checking that your ORG is visible, clear, not damaged, and not acting like a stormwater drain. That is a simple check that can save a major clean-up later.
4. Illegal or incorrect stormwater connections
Heavy rain does not have to be constant to cause a problem. The issue is often volume over a short period. The City of Gold Coast states that wet weather sewage overflows during heavy rain are typically caused by excessive and often illegal stormwater entering the sewer network. Toowoomba Regional Council says the same thing in plainer terms: stormwater must stay separate from sewerage to prevent overloading and sewer overflows during heavy rain.
So if your property has older plumbing, past renovations, unusual yard drainage, or downpipes located suspiciously close to sewer lines, this is a smart time to have it checked. A fault may stay hidden in dry weather and only show itself when the next strong storm rolls through.
5. Existing minor drain issues becoming bigger problems
The next few months are also the kind of period where a “small” drain issue becomes a bigger one. Redland City Council lists common causes of sewer blockages and overflows as tree roots entering pipework and stormwater entering and overloading the sewerage network, while Sydney Water notes that most wastewater blockages are also driven by roots, unflushables, fats, oils and grease.
In other words, if a pipe is already partially restricted, weather stress can be the thing that tips it over. A root mass that was only causing occasional slow drainage in March can become a full blockage by winter. A poor stormwater connection that never seemed urgent can suddenly matter the next time a heavy downpour hits.
What homeowners should do now
The smartest move is not to wait for a full overflow or complete blockage. Based on the current outlook, the biggest things worth checking over the next few months are:
- slow drains or gurgling toilets
- trees or large shrubs near sewer lines
- overflow relief gullies that are covered, buried or damaged
- downpipes and yard drainage that may be incorrectly connected
- recurring blockages that never seem fully resolved
With the Bureau forecasting warmer-than-average conditions and a broader drier signal across eastern Australia, but still warning that warmer seas can enhance storms and rain systems, this is a season where both dry-weather sewer issues and sudden wet-weather plumbing failures are worth taking seriously.
We recommend checking now rather than dealing with sewage backing up into the house, a flooded yard, or an emergency callout when the weather turns.
Contact RJT, your local Plumbing and Gas experts in North Lakes and Surrounding Suburbs
