• Microsoft reduced datacenter water use effectiveness from 2.3 L/kWh in the early 2000s to 0.27 L/kWh in 2025.
• The company says it has achieved a 25% cut in water-use intensity across its owned datacenter fleet, toward a 40% improvement target by 2030.
• Microsoft invested more than $500 million in over 75 water and wastewater infrastructure projects since 2020.

AI Growth Puts Water Use Under Scrutiny

Microsoft has cut the water intensity of its datacenters by nearly 90% since the early 2000s, as the company works to expand cloud and AI infrastructure without placing added pressure on local water systems.

The company said its average water use effectiveness, measured in liters per kilowatt-hour, fell from 2.3 L/kWh in its first-generation datacenters to 0.27 L/kWh in 2025. The metric has become more important as AI workloads increase energy demand and raise public scrutiny of datacenter resource use.

Microsoft has committed to a 40% improvement in datacenter water-use intensity across its owned fleet by 2030. By 2025, it had achieved a 25% reduction. The company also said it replenished more water than it withdrew across global operations in FY25, as part of its pledge to become water positive by 2030.

The push comes as governments, utilities and local communities examine how fast-growing digital infrastructure affects power grids, water supplies and municipal systems. For executives and investors, the issue is no longer operational alone. Water strategy now sits inside broader governance, site selection and license-to-operate decisions.

Cooling Technology Drives Efficiency Gains

Microsoft said much of the reduction came from changes in datacenter cooling. Since 2008, the company has used direct air cooling with evaporative assist as a primary approach across much of its fleet.

That system uses outside air for cooling and adds water only when temperatures rise above 85°F, or 29.4°C. In cooler regions, such as parts of Northern Europe, no water is needed for cooling throughout the year. In Dublin and Amsterdam, water is used less than 5% of the time. In Virginia, water is typically required about 10% of the year.

The picture changes in hotter regions. In Phoenix, water use for cooling can rise to as much as 40% of the year. Even so, Microsoft said about 90% of its 2025 owned datacenter fleet now operates with low- to zero-water cooling systems.

In 2024, the company introduced a new datacenter design for AI workloads that uses zero water for cooling during operations. The system relies on closed-loop, direct-to-chip cooling. Instead of evaporating water, it recirculates water inside sealed systems and targets heat at chip level.

That design matters for AI infrastructure. High-performance chips create dense heat loads. Older cooling models can strain both energy and water systems. Direct-to-chip systems can reduce that pressure, while helping operators support larger AI workloads.

Existing Sites Get Smarter Controls

Microsoft is also improving existing datacenters that still use water. The company said it is refining temperature and humidity setpoints to reduce overcooling. It also audits actual water use against design expectations, using real-time weather data and operational analytics.

Those changes are already producing results in high-stress water regions. In Phoenix, Microsoft reported a 23% year-over-year improvement in water use effectiveness in FY25. The company is now deploying similar improvements across its direct-evaporatively cooled datacenters globally.

These operational gains are important for investors tracking infrastructure risk. Retrofitting existing sites can reduce exposure faster than waiting for new facilities. It can also help companies manage community concerns in regions already facing water stress.

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Recycled Water and Rain Harvesting Expand

Microsoft is increasing its use of recycled, reused and non-potable water. In Quincy, Washington, 74% of water used at key facilities comes from those sources. In Singapore, the share is 99%. In San Antonio, Texas, it is 79%.

The company has also installed rainwater harvesting systems at select datacenters in the Netherlands, Sweden and Ireland. More systems are planned in Canada, the United Kingdom, Finland, Italy, South Africa and Austria.

In Quebec, Microsoft expects new datacenters to collect up to 1.5 million liters of rainwater a year, depending on local rainfall. The water can help offset already low withdrawals at those sites.

The approach reflects a wider trend in corporate water stewardship. Companies are moving beyond efficiency targets and looking at local water context, alternative sourcing and infrastructure resilience.

Community Infrastructure Becomes Part of the Deal

Microsoft said it works with utilities to plan for sourcing and infrastructure needs linked to its operations. Where system upgrades are required, the company said it funds those upgrades so communities do not carry the cost.

Near its datacenter in Leesburg, Virginia, Microsoft is funding more than $25 million in water and sewer improvements. Since 2020, it has invested more than $500 million in more than 75 water and wastewater infrastructure projects.

The company is also backing replenishment projects beyond its own sites. In the greater Phoenix area and nearby Nevada communities, it works with FIDO Tech and local utilities on AI-enabled leak detection. These systems find hidden breaks in aging water networks and help prevent water loss.

Across the Midwest, Microsoft works with The Nature Conservancy to restore historic oxbow wetlands. These crescent-shaped water bodies help recharge groundwater, reduce flood risk and support biodiversity.

What Executives and Investors Should Watch

Microsoft’s water strategy shows how AI infrastructure is moving into a new phase of ESG scrutiny. Datacenter growth now depends on more than land, power and fiber access. Water availability, utility capacity and community trust are becoming core business risks.

The company’s progress also shows that digital growth and lower water intensity can move together. Yet the challenge will grow as AI demand accelerates. More facilities will be built in markets with different climates, regulations and water pressures.

For C-suite leaders, the takeaway is clear. Water stewardship must be designed into infrastructure from the start. It also needs capital, governance and transparent local engagement.

Microsoft’s next test will be whether it can sustain water positive performance while scaling AI capacity. That outcome will matter beyond one company. It will shape how communities, regulators and investors judge the next wave of global digital infrastructure.

ESG News Editorial Team

The ESG News Editorial Team is comprised of veteran financial journalists and sustainability analysts dedicated to providing real-time, objective reporting on global ESG regulations, climate finance, and corporate governance. Our desk monitors daily developments from the SEC, IFRS, CSRD and international regulatory bodies to ensure our 1M+ readers receive accurate, data-driven insights into the evolving sustainable investment landscape. Follow the ESG News Editorial Team for expert reporting on global sustainability standards, ESG disclosures, and climate policy. Access over 10,000 investigative reports and real-time updates.