Water risk and infrastructure investment

The world has entered what the United Nations describes as an era of “global water bankruptcy”, in which many river basins and aquifers can no longer return to historical baselines. Infrastructure performance depends on the condition of the water systems it relies on; reliable supply, natural flood attenuation, and catchment filtration are operating inputs, not externalities. When these systems degrade, financial consequences flow directly through to operating costs, revenue, reliability, and asset lifespan. The report identifies four key findings: grey and green infrastructure are rarely evaluated as a single system, residual ecosystem risk is often implicitly carried by projects, stewardship is uncontracted and underfunded, and no established insurance market exists for water ecosystem risk.

Multiple drivers accelerate this instability, including climate change, which intensifies precipitation by approximately 2–3% per degree of warming, and global water demand, projected to increase by 20–30% by 2050. Furthermore, ecosystem degradation has seen wetlands decline by 35% since 1970. These risks are not future problems but are already cascading through systems, eroding asset performance and straining public finances. The report uses the World Wide Fund for Nature (WWF) Water Risk Filter to categorise risks across physical, regulatory, and reputational dimensions.

Water risk and infrastructure performance

In Africa, the dominant risk channels are hydropower vulnerability and urban service delivery failure. Water demand in sub-Saharan Africa is projected to increase by 163% by 2050, compounding an existing infrastructure deficit. For instance, the 2024 El Niño drought in Southern Africa collapsed hydropower generation at the Kariba Dam, which forced plant shutdown and triggered 21-hour blackouts across two economies reliant on hydropower for over 80% of generation. Similarly, in Nepal, September 2024 floods damaged at least 20 hydropower plants, reducing output by over 1.1 GW. In Asia, risks are defined by intensity at scale, with 74% of the population exposed to extremely high water stress and major rivers like the Indus expected to reach “peak water” by 2050.

Three case studies illustrate these challenges and potential solutions. The Xuan Mai project in Vietnam used a credit enhancement guarantee to mobilise local institutional capital for a surface-water system, avoiding arsenic-contaminated groundwater. In Cape Town, South Africa, the “Day Zero” crisis led to the clearing of invasive plants, which recovered 17.5 billion litres of water annually at a fraction of the cost of desalination. In China, the Wuhan “Sponge City” programme used hybrid green-grey infrastructure to manage flooding, saving an estimated CNY 4 billion compared to traditional grey alternatives. However, private capital mobilisation for such projects often falls short because the primary value—avoided damages—does not generate a contractable revenue stream.

Ecosystem services and infrastructure resilience

Infrastructure relies on ecosystem services for water supply, water quality, sediment control, and flood regulation. These dependencies become financially material when they weaken debt service coverage or project returns. For example, catchment degradation increases sediment loads, raising treatment costs and accelerating mechanical wear on equipment. The report recommends using valuation methodologies, such as cost-based methods or shadow water pricing, to translate these biophysical metrics into financial variables like CAPEX, OPEX, and asset life. The Panama Canal demonstrates the consequences of treating these dependencies as invisible, where transit restrictions during the 2023–24 drought caused significant losses.

Financing ecosystem-dependent infrastructure

Water infrastructure faces an estimated USD 6.7 trillion financing gap by 2030. Public sources currently provide 91% of funding, while private capital contributes less than 2%. This mismatch is structural, as financial markets require predictable cash flows within conventional horizons, whereas ecosystem services deliver benefits over extended timeframes. To address this, mechanisms such as green and blue bonds, blended finance, and payment for ecosystem services (PES) can be utilised. Parametric insurance can also provide rapid payouts after acute shocks, protecting downside scenarios. A core challenge remains converting avoided costs into contractable revenue that can service debt.

Decision framework for infrastructure developers and investors

A seven-step decision framework is proposed to identify, assess, and price water-related risks. The steps include identifying approaches (grey, green, or hybrid), selecting a response based on lifecycle economics, assessing material dependencies, and pricing risk into financial models using scenario stress testing. Investors are then encouraged to translate these findings into deal terms, such as specific covenants or tariff provisions, and structure the response using appropriate financing instruments. Finally, lifecycle governance must ensure that maintenance budgets for both grey and green components are ring-fenced and that monitoring tracks hydrological, ecological, and financial indicators.

Recommendations for infrastructure investors and financiers

The report provides recommendations across three layers. For the enabling environment, it suggests treating water risk as systemic and building standing coordination capabilities between utilities, land managers, and governments. In project design, ecosystem condition should be treated as a financial variable, and grey and green components must be appraised as a single system. In financing, the focus should be on funding the full lifecycle, including stewardship and risk transfer for shocks, rather than just the initial construction phase. Successful credit enhancement models, such as the Xuan Mai guarantee, should be standardised to make them replicable through standard templates rather than bespoke design.