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How Much Water Does a Data Centre Use? Data centres power the internet—from streaming and cloud storage to AI tools—but behind the scenes, they also consume significant amounts of water.  So how much are we really talking about, and why does it matter? Why Data Centres Use Water At their core, data centres are filled with servers that generate heat 24/7. To prevent overheating, operators rely on cooling systems—and many of these use water. There are two main cooling approaches: • Air cooling: Uses chilled air (less water, more electricity) • Liquid cooling: Uses water directly or indirectly (more efficient, but water-intensive) Water is especially common in evaporative cooling systems, where heat is removed through evaporation—similar to how sweat cools your body. So, How Much Water Are We Talking About? The answer varies depending on size, climate, and technology—but here are realistic benchmarks: A medium-to-large data centre can use 300,000 to 5 million gallons (1–19 million li...