Microsoft Reaches Water Positive Milestone Ahead of 2030 Goal

Microsoft has announced that in fiscal year 2025 it replenished more water than it withdrew globally, marking a significant milestone in its journey toward its 2030 water positive commitment, while also reporting that water use effectiveness has improved by nearly 90 percent since its first generation of data centres in the early 2000s, declining from 2.3 litres per kilowatt-hour to 0.27 litres per kilowatt-hour in 2025. The company has reduced water use intensity by 25 percent against its 2030 target of 40 percent improvement across its owned fleet, with approximately 90 percent of the 2025 owned fleet operating using highly efficient low to zero water cooling systems. Beyond its own operations, Microsoft has invested more than $500 million in more than 75 water and wastewater infrastructure projects since 2020 delivering community co-benefits, including more than $25 million in water and sewer improvements near its Leesburg, Virginia data centre campus to ensure local ratepayers do not shoulder the cost of supporting its facilities.

 

Two Decades of Cooling Technology Innovation

 

Microsoft's water efficiency journey began with foundational design choices in its earliest data centre builds, with the adoption in 2008 of direct air cooling with evaporative assist as the primary cooling approach across its fleet, a design using significantly less electricity and up to 90 percent less water than traditional water-based cooling systems by relying on water only when outside temperatures exceed 85 degrees Fahrenheit. The geographic variability of this approach demonstrates its efficiency in practice: in parts of Northern Europe no water is required for cooling throughout the year, in Dublin and Amsterdam water is used less than 5 percent of the time, in Virginia water is typically required only 10 percent of the year and in Phoenix it may increase to as much as 40 percent of the year. In 2024 Microsoft introduced a new data centre design optimised for AI workloads that consumes zero water for cooling during operations through a closed-loop direct-to-chip cooling system that delivers precise zonal temperature control without water evaporation, with the addition of these zero-water designs expected to further reduce water use intensity as the fleet expands.

Operational improvements to existing facilities have complemented the architectural innovations, with continuous optimisation of temperature and humidity setpoints, real-time weather data and operational analytics for auditing water use against design expectations and ongoing hardware improvements all contributing to meaningful efficiency gains. In Phoenix, Arizona specifically, implementation of these operational advancements delivered a 23 percent year-over-year improvement in water use effectiveness in fiscal year 2025 alone, a result now being deployed across direct evaporatively cooled data centres globally. Judy Priest, Corporate Vice President and Chief Technology Officer of Cloud Operations and Innovation at Microsoft, and Steve Solomon, Vice President of Datacenter Engineering, co-authored the disclosure, providing senior leadership visibility into water stewardship that signals its strategic priority within Microsoft's infrastructure organisation.

 

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Recycled Water and Alternative Source Expansion

 

Beyond efficiency improvement, Microsoft prioritises the substitution of recycled, reused and non-potable water for freshwater wherever possible, with Quincy, Washington using 74 percent recycled or non-potable sources, Singapore using 99 percent and San Antonio, Texas using 79 percent, demonstrating that near-complete displacement of freshwater with recycled sources is operationally achievable in favourable regulatory and infrastructure environments. Rainwater harvesting systems are now operational at select data centres in the Netherlands, Sweden and Ireland with additional installations planned in Canada, the United Kingdom, Finland, Italy, South Africa and Austria, with Microsoft's new Quebec data centres expected to collect up to 1.5 million litres of rainwater annually. On-site water treatment systems that recycle water multiple times for cooling operations are deployed as needed, producing purified water suitable for reuse within cooling systems and reducing dependence on utility water supplies across the most water-intensive facility types.

The combination of efficiency improvement, recycled source substitution and rainwater harvesting creates a layered water stewardship architecture that addresses water consumption through multiple complementary pathways simultaneously rather than relying on any single approach. This multi-pathway water management strategy is particularly important for a hyperscale operator with facilities across diverse climatic, regulatory and infrastructure environments where the optimal combination of water efficiency, source substitution and alternative supply varies significantly by location and season.

 

Community Water Investment and Replenishment

 

Microsoft's Datacenter Community Pledge commits the company to protecting local watersheds, engaging stakeholders and investing in projects that strengthen regional water resilience, with the company funding system improvements in full so communities do not bear the cost of supporting its operations. The $500 million invested in more than 75 water and wastewater infrastructure projects since 2020 provides a concrete financial measure of Microsoft's community water stewardship that goes beyond the operational footprint into the broader regional water systems that its data centres affect through their presence in local communities. Specific replenishment initiatives include AI-enabled leak detection deployed in partnership with FIDO Tech and local utilities in the Phoenix and Nevada areas to identify and repair hidden breaks in aging water systems, and the restoration of historic oxbow wetlands across the Midwest in partnership with The Nature Conservancy to recharge groundwater, reduce flood risk and enhance habitat.

The fiscal year 2025 achievement of global water positive status, replenishing more water than withdrawn across the full global operations, represents the most significant near-term milestone in Microsoft's water stewardship journey and demonstrates that the combination of efficiency improvement, recycled source substitution, rainwater harvesting and community replenishment investment can deliver net positive water outcomes at hyperscale even as data centre capacity continues to expand to meet growing cloud and AI demand.

 

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Outlook for Microsoft Data Centre Water Stewardship

 

Whether Microsoft can sustain water positive performance over time as its data centre fleet continues to expand and AI workload intensity creates new thermal management demands will be the long-term operational test of its 2030 water positive commitment, requiring that the pace of efficiency improvement and replenishment investment keeps pace with growing water demand from capacity expansion. The zero-water cooling design for AI workloads introduced in 2024 provides the foundational technology for decoupling future AI infrastructure growth from water consumption, but its deployment across the expanding fleet must accelerate at a rate that offsets the water demand of legacy and transitional facility types. The exploration of zonal cooling architectures that more precisely align cooling approaches with different hardware type requirements signals continued technology investment in water efficiency that will support the long-term water positive trajectory as the data centre portfolio evolves toward increasingly energy and thermally intensive AI workloads.

 

Source: Microsoft