Water shortages are threatening major cities across multiple regions of the world, according to coordinated reports released on November 8, 2024, with rapid urbanisation, the accumulating effects of climate change, and the deterioration of ageing infrastructure combining to produce conditions in which the reliable supply of water to populations of millions has become increasingly precarious. The reports, prepared by international water organisations, national and regional authorities, and specialist research institutions, describe a situation that is unfolding in parallel across very different cities in very different climates, and that requires urgent attention to both immediate crisis management and longer-term structural investment.

The specific cities identified in the reports as currently facing acute water stress span multiple continents and climatic zones. Cities in regions historically prone to drought have been facing particularly acute conditions. Cities in regions not historically considered water-stressed have been experiencing the combined effects of population growth, infrastructure ageing, and shifting climate patterns in ways that are producing specific pressures unprecedented in their recent history. Cities dependent on single primary water sources have been particularly vulnerable to specific disruptions, while cities with more diversified water systems have generally fared better but are not immune to the broader pressures affecting the sector.

The Scale of the Challenge

The specific indicators documented in the reports describe the scale of the current challenge. Reservoir levels in many of the affected cities have been running at historically low levels for extended periods, in some cases at percentages of capacity that require specific emergency measures to maintain continuity of supply. Groundwater aquifers underlying many major cities have been experiencing specific drawdown rates that exceed the natural rates of recharge, producing specific long-term concerns about the sustainability of that resource as a component of urban supply. Specific water-quality issues, including the deterioration of source water quality under specific climate and pollution pressures, have been adding further complications to the supply picture.

Per capita water availability in many affected cities has been falling as populations grow and as the specific per-capita demand of different segments of population has been shifting. Specific patterns of water use — across domestic, commercial, industrial, and agricultural sectors — have been changing, producing specific demand profiles that require specific management responses. The cumulative effect has been pressure on water systems that in many cases exceeds the capacity they were designed to handle, and that will require specific investments and specific policy responses to address sustainably.

The Drivers of the Situation

Several interacting drivers have produced the current situation. Rapid urbanisation has been perhaps the most fundamental, with city populations growing substantially across many regions and with specific patterns of growth that have placed specific pressures on water systems. Urban populations require specific infrastructure to deliver water reliably, and the pace at which infrastructure has been built has in many cases lagged the pace of population growth. The specific demographic transitions underway in many regions will continue to drive urban population growth for decades, and the specific pressures on water systems will continue to intensify in the absence of specific responses.

Climate change has been adding specific pressures through multiple pathways. Changes in precipitation patterns — including both reduced overall rainfall in specific regions and increased variability of rainfall across seasons and years — have been affecting the reliability of the sources on which urban water systems depend. Rising temperatures have been increasing evaporation from reservoirs and specific demand for water across several sectors. Specific extreme events — including floods that damage infrastructure, droughts that reduce availability, and specific storms that affect water quality — have been producing specific disruptions. Sea-level rise has been producing specific pressures on coastal aquifers through saltwater intrusion.

Infrastructure ageing has been a particular concern in many cities. Water systems built decades ago, often to standards and capacities that reflected the conditions of their time, have been deteriorating and have in many cases not received the sustained investment required to maintain their performance. Specific infrastructure losses — through leaks in distribution networks, through specific failures of treatment plants, and through specific deterioration of specific system components — have been reducing effective capacity and adding to operational costs. In several high-profile cases, specific infrastructure failures have produced acute crises that have required specific emergency responses and that have drawn attention to the cumulative consequences of deferred investment.

Specific pollution of water sources, through a combination of agricultural runoff, industrial discharge, urban wastewater, and specific emerging contaminants, has been adding to the complexity of producing safe drinking water. Treatment requirements have been increasing, and specific categories of contaminants — including specific chemicals that conventional treatment cannot fully address — have been requiring specific investments in advanced treatment capabilities. The specific costs of maintaining water quality have been rising in many systems, with specific consequences for the overall economics of urban water supply.

Economic and governance factors have also been significant. The specific arrangements through which urban water systems are managed, financed, and regulated vary widely across cities, and the specific effectiveness of different models has been a continuing subject of research and policy debate. Specific public, private, and mixed models have each shown specific strengths and specific weaknesses, and the conditions under which each performs well have been clarified through accumulating experience.

The Impact on Residents

For the residents of affected cities, the specific experience of water shortages takes several forms. Periodic supply interruptions, in which water is available only during specific hours of the day, have become features of daily life in several of the worst-affected cities. Specific rationing programmes, in which households are limited to specific quantities of water per period, have been implemented in several contexts. Price increases have been substantial in some cases, with specific concerns about the affordability of water for low-income households. Specific quality issues have affected trust in public supply and have driven specific behaviours including the purchase of bottled water or the reliance on specific private supply arrangements.

The distribution of impacts across populations has been uneven. Low-income households, populations in informal settlements, and specific marginalised groups have typically been most affected by water shortages, both because they are more likely to live in areas where service is weakest and because they have fewer resources to buffer themselves from the specific effects of shortages. Specific concerns about water equity — about the distribution of water access and affordability across different segments of urban populations — have been central to the policy debates surrounding responses to the current challenges.

Health consequences of water shortages have been documented in specific contexts. When reliable piped water supply is interrupted, households may resort to alternative sources of variable quality, with specific consequences for waterborne illness. Specific hygiene practices may be affected when water availability is limited, with potential consequences for the transmission of other illnesses. Specific vulnerable populations — including elderly residents, young children, and residents with specific chronic conditions — may be particularly affected by the combined stresses of supply interruptions and their secondary consequences.

Economic consequences have been significant in specific contexts. Businesses that depend on reliable water supply — including hospitality, food service, healthcare, and specific industrial operations — have been affected by supply interruptions and have incurred specific costs for alternative arrangements. Tourism in some affected destinations has been affected by specific water-related developments. Specific sectors have had to make specific investments to adapt their operations to the available water resources, with implications for their competitiveness and their long-term viability in affected cities.

The Responses Being Mounted

City authorities across the affected regions have been mounting specific responses that combine immediate crisis management with longer-term structural investments. On the supply side, specific investments in new water sources have been significant, with specific projects to develop additional reservoirs, to expand groundwater access where sustainable, to develop desalination capacity in coastal cities, to increase water reuse and recycling, and to develop specific interbasin transfer arrangements all being implemented or planned in specific contexts. The specific mix of supply-side responses varies across cities depending on specific geographic, economic, and political conditions.

On the demand side, specific programmes to reduce water consumption have been central to many responses. These have included specific pricing mechanisms designed to reflect the true scarcity value of water, specific regulatory measures limiting particular uses of water during shortages, specific programmes to promote water-efficient technologies in households and businesses, and specific awareness and behaviour change campaigns. The specific effectiveness of different demand-side measures has been the subject of substantial research, and specific best practices have been identified and documented.

Infrastructure investment has been a third major area of response. Specific programmes to reduce water losses in distribution networks — which in many cities account for substantial proportions of water produced — have been producing measurable benefits where they have been implemented at scale. Specific investments in treatment infrastructure, in specific operational improvements, and in the modernisation of monitoring and control systems have all been contributing to system performance. The specific financing of infrastructure investment has been a recurring challenge, with specific implications for the specific political economy of water management in many cities.

Governance and institutional reforms have been the fourth major area. Specific reforms to the regulatory frameworks under which urban water systems operate, to the specific governance arrangements of water utilities, to the specific processes for setting prices and making investment decisions, and to the specific mechanisms for coordinating across the multiple actors involved in urban water have all been advancing in specific contexts. The specific effectiveness of different reforms has varied, and specific lessons from particular experiences have been informing wider debates about the governance of urban water.

Specific Cities and Specific Responses

The reports include specific case studies of cities that have been navigating water shortages with varying degrees of success. Cities that experienced acute crises in earlier years and that have since made substantial investments in supply diversification, demand management, infrastructure, and governance have generally been performing better than cities that have deferred such investments. Specific cities have developed specific innovative approaches — including specific approaches to water recycling, specific pricing mechanisms, specific partnerships with catchment-level actors, and specific approaches to community engagement — that have been drawing attention from other cities facing similar challenges.

The specific experience of cities that have come through major water crises has generated specific lessons that inform current responses. Key among these are the importance of early action rather than delayed response, the importance of sustained investment across multiple dimensions rather than reliance on any single intervention, the importance of clear communication with the public and specific engagement with affected communities, the importance of data and monitoring as foundations for decision-making, and the importance of governance arrangements that can sustain difficult choices over extended periods.

At the same time, specific cities that are currently facing acute pressures have been struggling to marshal the resources and the specific political support required for the scale of response that their situations demand. Specific barriers — including fiscal constraints, specific institutional weaknesses, specific political dynamics, and specific challenges in public communication — have been slowing the specific responses that current conditions would warrant. The contrast between cities that have invested consistently and cities that have not has been a recurring theme of the analyses, and it informs specific recommendations for cities that want to avoid the most severe consequences of water stress.

International Dimensions

International dimensions of urban water management have been receiving specific attention. Many of the river basins on which major cities depend cross political boundaries, and specific arrangements for the management of shared water resources have been essential elements of the water security of particular cities. Specific international frameworks for transboundary water management — including specific bilateral and multilateral agreements, specific river basin organisations, and specific international law principles — have been shaping how cities navigate their dependence on shared resources.

International support for urban water investment has been a continuing focus. Multilateral development banks, bilateral development agencies, and specific international funds have been providing significant financing for urban water infrastructure in many contexts. Specific partnerships — including between cities themselves through specific city-to-city networks — have been facilitating the exchange of expertise and specific practices. The specific challenges of financing urban water at the scale required, particularly in contexts where public resources are limited, have been subjects of specific innovation in recent years, with specific green finance instruments, specific blended finance arrangements, and specific resilience-focused investments all contributing.

Looking Ahead

The reports are explicit that the pressures on urban water systems will continue to intensify in the coming decades. Urbanisation will continue. Climate change will continue. Infrastructure will continue to age. Without specific and sustained investment across multiple dimensions, the specific consequences of current trends will accumulate into more acute and more widespread crises. The window for preventive action, while still open, is narrowing, and the specific costs of delayed response — in human terms, in economic terms, and in specific environmental terms — will continue to rise.

At the same time, the reports are explicit that effective responses are possible and that specific cities have demonstrated what can be achieved when sustained commitment meets adequate resources. The specific work of securing water for urban populations is demanding and complex, but it is not beyond the capacity of the global community if the sustained attention required can be mobilised.

For the residents of cities currently facing water shortages, the immediate experience is one of disruption, specific concern, and in some cases genuine hardship. The specific responses being mounted, while often insufficient in scale or pace, reflect the commitment of authorities, utilities, and communities to addressing the specific challenges they face. The specific choices being made now will shape not only the immediate experience but the conditions under which those cities will continue to function in the decades ahead.

A Shared Challenge

Water security is, ultimately, a shared challenge that connects the specific circumstances of individual cities to broader patterns of climate change, development, and governance. The specific responses of individual cities matter, but they operate within broader contexts that require specific action at national and international levels. The scale of investment required to address the aggregate water security challenges facing the world's cities is substantial, and specific commitments at multiple levels will be required to deliver it.

Today's reports are a contribution to the work of making the specific choices that will shape the water future of major cities in the coming decades. The specific evidence they assemble, the specific recommendations they make, and the specific lessons they draw from particular experiences are intended to inform the decisions of those who will determine how cities respond to the pressures now bearing on them. Whether those decisions will be made with the urgency the situation requires remains to be seen, but the case for action has been made as clearly as the available evidence permits.

For today, the message is straightforward. Major cities face growing water pressures. The tools to respond exist. The specific responses being mounted in various cities show what is possible. What remains is the sustained commitment — across governments, utilities, communities, and international partners — to apply those tools at the scale the challenge demands. The water futures of hundreds of millions of urban residents depend on whether that commitment can be mobilised, and on the choices being made, in specific cities, in specific institutions, and in specific international forums, in the months and years ahead.