As rainfall continues to decline, Perth is attempting to balance its reliance on energy-intensive desalination and declining groundwater aquifers.
Perth is situated in one of the world's most rapidly drying climate zones. Since the 1970s, the south-west of Western Australia has seen a drastic and sustained reduction in winter rainfall. This shift fundamentally broke the city’s historical reliance on surface water dams to support its booming suburban population and extensive agriculture.
To survive climatic drying, Perth successfully engineered its way out of immediate water scarcity over the past two decades. The city now relies heavily on two primary sources: a network of energy-intensive ocean desalination plants, and the massive extraction of groundwater from the Gnangara Mound, a shallow aquifer network sitting directly beneath the city.
However, the balancing act is becoming increasingly precarious. The ongoing depletion of the groundwater aquifers is threatening urban wetlands, suburban lakes, and native bushland. To save the aquifers from ecological collapse, the state government has been forced to steadily wind back the amount of groundwater that local councils, agriculture, and private households are allowed to extract.
There is a growing cultural and political clash between Perth's traditional aesthetic and environmental reality. The sprawling, green, lawn-heavy garden suburb is deeply ingrained in the local lifestyle, heavily subsidized in the past by easily accessible, cheap groundwater ("garden bores").
Environmental scientists and the state water corporation argue that strict, ongoing reductions in domestic and civic watering limits are non-negotiable to protect the remaining aquifers. However, restricting water access is deeply unpopular. Local councils fear the loss of green public spaces, sporting fields, and tree canopy, arguing that a browner urban environment will increase the "urban heat island" effect during Perth's already brutal summers.
The long-term infrastructure response to declining groundwater is the construction of more desalination capacity. Watch the progress and environmental approvals of new major desalination projects along the coast, which are heavily reliant on massive amounts of renewable energy to ensure they don't contribute to the carbon emissions driving the drying trend in the first place. Furthermore, monitor ongoing community pushback as tighter water restrictions invariably come into effect over the hotter months.