For a city that flooded as recently as last year, it can feel strange to talk about water scarcity. Yet southeast Queensland’s long-term storage picture is tighter than the recent wet seasons suggest.
Lake Wivenhoe, the region’s largest storage west of Brisbane, has gone more than five years without a significant inflow. It sat at 39 per cent capacity, its lowest level since the Millennium Drought, even as coastal dams topped up from passing storms.
The reason is geography. Much of the rain in recent wet seasons fell on the coastal catchments, while the inland catchment that feeds Wivenhoe stayed comparatively dry. 
Under the region’s drought plan, restrictions come back into consideration once combined dam levels fall toward the halfway mark. That puts outdoor water use, including cleaning, back on the agenda.
The Problem With the Old Approach
The traditional way to clean a wall or a driveway was to point a hose or a pressure washer at it and let volume do the work. It is effective and it is wasteful.
A standard pressure washer moves a surprising amount of water, and a long session cleaning a full house exterior and driveway can run through hundreds of litres.
In a region being asked to keep daily use down, that volume is hard to justify, particularly for what is essentially a cosmetic task. Surveys have found southeast Queenslanders already use slightly more per person than the drought plan targets.
The other problem is that high-volume blasting is not even the best method for a lot of surfaces. Living growth such as mould and lichen returns quickly when it is merely rinsed rather than treated.
So the wasteful approach is often the less effective one, which is an unusual position for a cleaning method to be in.
How Low-Water Methods Changed the Trade
Soft washing flips the equation. Instead of relying on water pressure and volume, it applies cleaning solutions that break down the organic growth, then uses a comparatively gentle rinse.
That means far less water for a result that lasts longer, because the treatment kills the growth at the root rather than blowing the surface layer off. For a household trying to get rid of exterior grime without running afoul of water-wise expectations, the lower-volume method is the obvious fit.
The approach also suits Brisbane’s housing stock. Delicate painted timber and older roof coatings respond better to a gentle, solution-based clean than to high pressure, so the water-saving method and the surface-safe method turn out to be the same method.
Harder surfaces still call for genuine pressure, but even there the trade has moved toward surface cleaners that contain the spray and use water more efficiently than an open wand.
Many operators also avoid harsh chemicals that could wash into stormwater drains and waterways, which matters more in a region conscious of catchment health.
A Practical Position for a Variable Climate
Brisbane’s water future is not a simple story of drought or flood. It is both, often in the same year, and that variability is the planning challenge.
A wet summer can fill the coastal dams while the main inland storage keeps falling, which is roughly what happened heading into 2026. Households cannot easily read the headline rainfall and know whether they should be conserving.
That uncertainty is an argument for adopting water-wise habits as a default rather than switching them on only when restrictions bite. Cleaning is a small part of household water use, but it is a visible one, and visible waste draws attention during a dry stretch.
Choosing a method that uses less water to begin with sidesteps the question. It works whether or not restrictions are in force, and it does not need to be abandoned the moment the dams dip.
For a region that swings between extremes, the sensible exterior-cleaning approach is the one that holds up in both. Less water, treated at the root, safe for the surface and the catchment.
The dams will rise and fall again. The case for cleaning a home efficiently, rather than blasting it, holds steady through either.
