Public stormwater infrastructure in New South Wales (NSW) is at a critical juncture, facing a systemic funding crisis that threatens economic prosperity, environmental health, and community safety. The current framework for financing the lifecycle of these essential assets—from planning and construction to maintenance and renewal—is structurally inadequate, fragmented, and unsustainable. This has resulted in a significant and growing infrastructure renewal backlog, conservatively estimated in 2012 at over $633 million, a figure that has undoubtedly grown and is being dangerously accelerated by the impacts of climate change.
This report presents a comprehensive lifecycle analysis of public stormwater infrastructure funding in NSW. It finds that the governance of stormwater is fractured, with responsibilities divided between property owners, local councils, and state-owned corporations like Sydney Water. This fragmentation fundamentally obstructs the integrated, catchment-wide management necessary to address modern stormwater challenges. Local councils, who own and manage the vast majority of stormwater assets, are encumbered by an unfunded mandate: they hold the primary responsibility for service delivery but are constrained by state-imposed financial limitations, most notably rate-pegging and a severely deficient dedicated funding source.
The primary mechanism for funding ongoing maintenance and renewal, the Stormwater Management Service Charge (SMSC), is a structurally flawed instrument. Capped at a nominal $25 per residential property, it is inequitable, has its real value eroded by inflation annually, and is incapable of generating the revenue required to maintain a multi-billion-dollar asset base. Consequently, councils are forced to divert scarce funds from general revenue, creating an unsustainable competition with other essential services. While sophisticated Asset Management Plans are developed, they increasingly serve to document a strategy of “managed decline” rather than sustainable service delivery.
Capital funding for new assets, primarily sourced from developer contributions, exhibits a “greenfield bias,” effectively servicing new growth areas while leaving existing urban catchments without a viable funding stream for major renewal. Furthermore, this model creates a “lifecycle cost blind spot,” funding the creation of new assets without providing for their long-term operational and renewal costs, thus adding to the future unfunded liability.
In contrast, alternative funding models demonstrate superior outcomes. Melbourne Water’s integrated “Waterways and Drainage Charge” provides a powerful example of a catchment-based governance and funding structure that is equitable, scalable, and capable of funding a comprehensive suite of stormwater and waterway health services. Similarly, the impervious-area-based stormwater utility model, widely adopted internationally, establishes a fair ‘user-pays’ system that not only generates adequate revenue but also creates a powerful financial incentive for property owners to reduce runoff at its source.
This report concludes with a multi-layered framework of recommendations for reform. Immediate actions focus on stabilising the system by removing the cap on the SMSC and commissioning an urgent update of the infrastructure backlog. Medium-term reforms propose the foundational work for a new model, including mandating the mapping of impervious surfaces and piloting a user-pays utility fee. The long-term transformation requires structural change: enacting a new NSW Stormwater Management Act to establish a user-pays principle as the default funding mechanism and undertaking a comprehensive review of governance in Greater Sydney to create a more integrated, catchment-based management authority. Without these fundamental reforms, NSW will continue to defer a mounting liability, placing its communities, environment, and economy at increasing risk from the consequences of failing stormwater infrastructure.
