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The global water supply is dwindling, according to a report from the World Meteorological Organization (WMO) released on Thursday. The European Central and Eastern regions are particularly hard hit by the decrease in groundwater levels in 2025, according to the WMO's State of Global Water Resources annual report. Several other areas reported significant deficits compared to the 2014-2024 period, while most of Northern Europe's groundwater levels remained above the long-term average.

Human-induced climate change, increased demand for water from a growing global population, and declining natural recharge all contribute to changes in water resources, said Wayne Jenkinson, head of WMO's Hydrology and Cryosphere Section. Water reserves have been continually shrinking over the past few decades, including groundwater, lake water, glacial ice, soil moisture, vegetation, snow, and ice.

WMO Chief Celeste Saulo likened the water deficit to a savings account that has been depleted. Nearly two-thirds of monitored reservoirs had less water last year than the long-term average, according to the report. Water flowing through rivers worldwide is also at an all-time low, with 2025 being one of three years in the past 35 years with the lowest river runoff.