Microsoft has reported a significant reduction in the water intensity of its global datacenter operations, achieving a 25% improvement in water-use intensity as of 2025 toward its 2030 goal of a 40% reduction. The company, which is pursuing a commitment to become “water positive” by 2030, managed to replenish more water than it withdrew across its global operations during the 2025 fiscal year, according to company disclosures.
Microsoft’s strategy to address this involves a combination of engineering design, such as closed-loop cooling systems, and direct investment in community water infrastructure.
Two Decades of Cooling Innovation
The company’s approach to water stewardship has evolved since it began building datacenters in the early 2000s. According to internal engineering data, Microsoft has improved its water use effectiveness (WUE)—a metric measuring liters of water used per kilowatt-hour of energy—by nearly 90% since those early facilities. The average WUE dropped from 2.3 L/kWh to 0.27 L/kWh by 2025.
Design choices have been central to these gains. Starting in 2008, Microsoft transitioned to direct air cooling with evaporative assist. This method relies on ambient air temperatures to cool hardware, using water only when external temperatures exceed 85°F (29.4°C). In cooler climates, such as parts of Northern Europe, these systems can operate without consuming water for cooling throughout the year. Data indicates that approximately 90% of the company’s owned datacenter fleet now utilizes low- to zero-water cooling systems.
In 2024, Microsoft introduced a new generation of datacenter designs specifically optimized for AI workloads. These facilities utilize a closed-loop, direct-to-chip cooling system that recirculates water without evaporation, providing precise zonal temperature control. This shift toward liquid-cooled architectures is intended to support the high-density computing requirements of modern AI models while eliminating water consumption for cooling at those sites.
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Operational Efficiency and Alternative Water Sources
Beyond hardware design, Microsoft is applying real-time analytics to manage existing facilities. By using operational data and weather patterns, the company adjusts temperature and humidity setpoints to prevent overcooling. In Phoenix, Arizona, these optimization efforts resulted in a 23% year-over-year improvement in WUE during fiscal year 2025.
The company is also diversifying its water supply by prioritizing non-potable sources. In locations such as Singapore, Quincy, Washington, and San Antonio, Texas, Microsoft utilizes recycled or non-potable water for 99%, 74%, and 79% of its operational needs, respectively. Additionally, the firm has implemented rainwater harvesting systems in the Netherlands, Sweden, and Ireland, with plans to expand these installations to the United Kingdom, Finland, Italy, Austria, and South Africa.
For example, new facilities in Quebec are designed to capture up to 1.5 million liters of rainwater annually, depending on local precipitation, which helps reduce reliance on municipal freshwater supplies.
Community Infrastructure and Watershed Protection
Microsoft’s “Datacenter Community Pledge” includes commitments to protect local watersheds and invest in regional water resilience. Since 2020, the company has invested more than $500 million in over 75 water and wastewater infrastructure projects globally. These projects are intended to modernize systems and ensure that the expansion of digital infrastructure does not place an undue burden on local ratepayers.
In Leesburg, Virginia, Microsoft committed more than $25 million toward water and sewer upgrades to support local infrastructure needs. The company also partners with organizations like The Nature Conservancy to restore wetlands, such as historic oxbows in the U.S. Midwest, which assist in natural groundwater recharge and flood mitigation.
Additionally, the company is deploying AI-enabled leak-detection technology in partnership with FIDO Tech and local utilities in Arizona and Nevada. This technology identifies hidden breaks in aging municipal water systems, preventing waste and increasing the volume of usable water available to local residents.
The Path Toward 2030
The milestone reached in fiscal year 2025—where the company replenished more water than it withdrew—marks a key step in its 2030 water positive commitment. To maintain this trajectory, Microsoft is exploring zonal cooling architectures that align cooling methods with the specific hardware requirements of varying AI and traditional cloud workloads.
As the company continues to scale its global cloud infrastructure, it faces the challenge of decoupling growth from resource consumption. Future updates on these initiatives are expected as the company publishes subsequent environmental data fact sheets.