LONDON — The global water footprint embedded in international food and agricultural trade has roughly tripled over the past four decades, pushing water stress and supply-chain risk deeper into the world’s grocery basket, according to a new analysis by Chatham House, Dec. 25, 2025.
The report says “virtual water” moved through traded crops and farm goods swelled to about 2,800 cubic kilometers from 1986 to 2022, as diets, incomes and population growth boosted demand for water-intensive products — while weak pricing and regulation often left exporting regions carrying the environmental costs. In its policy recommendations, the paper calls for governments to overhaul farm subsidies that reward water-hungry production and for importing markets to require stronger disclosure and due diligence across supply chains.
Water footprint risks are rising faster than consumers can see
Chatham House frames the trend as a widening gap between consumption and impact: trade concentrates water use in producer regions, but the consequences — depleted aquifers, polluted waterways and reduced resilience to drought — are frequently “invisible” to end buyers. The report argues that where water scarcity is not reflected in prices, trade can accelerate depletion even if it improves global “efficiency” on paper.
Those pressures matter because agriculture remains the planet’s biggest freshwater user. The U.N. Food and Agriculture Organization estimates farming accounts for about 70% of global freshwater withdrawals, leaving little slack as heat and rainfall patterns shift. The Chatham House authors warn that water stress can quickly become a market problem: crop failures, export restrictions and price spikes travel as easily as grain shipments.
Subsidies, disclosure and who pays for the water footprint
The report’s sharpest critique targets policy incentives. Subsidies and price supports, it says, can encourage production in places already running short of water, effectively exporting scarcity. Chatham House urges governments to redirect support toward water-smart cropping, irrigation upgrades and basin-level limits — and to stop rewarding expansion where withdrawals are unsustainable.
It also presses importing countries and major retailers to treat the water footprint like a material supply-chain risk, not a niche sustainability metric. That means mandatory reporting on water use and pollution in sourcing regions, plus procurement rules that favor suppliers operating within local water limits. Corporate disclosure frameworks already exist, but participation is uneven and enforcement is limited.
Water footprint research has been building for years
The new findings extend a line of work dating back more than a decade. A Water Footprint Network report on virtual water trade helped popularize the idea that imports and exports quietly redistribute water use across borders. Later studies warned that climate change could reshape these flows — including a Nature Communications paper on future changes in virtual water trade — and research has mapped how trade links local water conditions to global markets, such as work on global virtual water trade and the hydrological cycle.
Chatham House argues the takeaway is no longer theoretical: the water footprint is growing, concentrated and, in many basins, unsustainable — a combination that can undermine food security and political stability. “Virtual” does not mean harmless, the authors suggest; it means distant.
The full analysis is published as “The water footprints of global food and agriculture trade”. For broader context on agriculture’s share of freshwater use, see FAO’s water and agriculture overview. Related recent warnings on trade and inequity appear in a U.N. University report, while the policy debate over pricing and governance is echoed in modeling and recommendations from the Global Commission on the Economics of Water.
