Data Centers potentially use a lot of water – What are the other options ?

May 19, 2026 | By Brian

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Data Centers potential use a lot of water – what are the other options ?

Data centers primarily consume water for cooling high-density servers, especially with the rise of AI workloads that generate significant heat. Traditional evaporative cooling (using cooling towers) is efficient for energy but leads to high consumptive use—water is lost to evaporation, often millions of gallons per day for large facilities. A typical large data center might use hundreds of thousands to millions of gallons daily, with evaporative systems losing 30-40% or more to the atmosphere. (Source:eesi.org)

Consumptive use refers to water that’s withdrawn and not returned to the source (mainly via evaporation). Indirect use (from electricity generation) also adds to the footprint, but direct options focus on on-site cooling. (Source:spectrum.ieee.org)

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Main Cooling Approaches and Water Impact

Evaporative (water-based) cooling: Common, energy-efficient, but high water consumption (open-loop or hybrid towers). Up to 80% of withdrawn water can evaporate. (Source:fwpcoa.org)
Air/dry cooling: Uses ambient air and fans/chillers with no or minimal evaporation. Virtually zero consumptive water use (beyond minor humidification). More energy-intensive, especially in hot climates. (Source:blog.equinix.com)
Liquid cooling (server-level): Direct-to-chip (cold plates on CPUs/GPUs) or immersion (servers submerged in dielectric fluid). Highly efficient for heat transfer; pairs with closed-loop systems for very low water use. Ideal for high-density AI racks. (Source:vertiv.com)

Key Options to Reduce Consumptive Water Use

Here are practical, deployed, or emerging strategies:

Dry/Air Cooling Systems (including free cooling with ambient air)
- Use air-cooled chillers, dry coolers, or economizers that leverage cool outside air.
- Water savings: Near-zero evaporation in many setups (e.g., Novva Data Centers in desert regions use ambient air + occasional refrigeration).
- Trade-off: Higher electricity use; best in cooler or water-stressed areas. Some operators switch to this proactively in drought-prone zones. (Source:novva.com)
Closed-Loop Systems
- Water (or coolant) recirculates in sealed pipes/loops with minimal makeup water added for losses. Heat is rejected via dry coolers or heat exchangers.
- Water savings: Up to 70%+ reduction vs. open evaporative; some achieve near-zero evaporation. Microsoft has deployed designs with zero water consumption for cooling. (Source: microsoft.com)
- Often combined with liquid cooling for efficiency.
Advanced Liquid Cooling (Direct-to-Chip or Immersion)
- Fluids transfer heat more effectively than air (higher thermal capacity).
- Water savings: Dramatically lower facility water needs; can reduce overall consumption by 20-90% depending on design and climate. Enables higher densities with less bulk cooling. (Source: weforum.org)
- Dielectric fluids in immersion often require no water evaporation at all once the loop is closed.
Geothermal and Natural Source Cooling
- Aquifer thermal energy storage (ATES), deep lake water cooling (DLWC), or seawater.
- Examples: Equinix uses lake water in Toronto (reduced energy 50%, low water impact as it’s returned).
- Water savings: Minimal consumptive use; leverages stable ground/water temperatures. (Source: blog.equinix.com)
Hybrid and Efficiency Optimizations
- Combine air/liquid with thermal storage, side-stream filtration, or reverse osmosis for better reuse.
- Reclaimed/wastewater instead of potable sources.
- Heat reuse (export to district heating) reduces overall cooling demand.
- Operational tweaks: Better maintenance, humidity control, and monitoring (e.g., Water Usage Effectiveness – WUE metric). (Source:energy.gov)

Additional Considerations

Location matters: Prioritize cooler climates, areas with abundant non-potable water, or where energy-water trade-offs favor dry systems. Many new builds target water-stressed regions with low-water tech. (Source:spectrum.ieee.org)
Trade-offs: Water-saving methods often increase energy use (and indirect water via power plants). Balancing both is key—e.g., via renewables.
Industry Trends: Hyperscalers (Microsoft, Google, Equinix) are committing to water-positive goals, closed-loop/zero-evaporation designs, and reporting. Startups focus on microfluidics, advanced dry coolers, and immersion. Projections show water demand rising sharply with AI, making these shifts urgent. (Source: netzeroinsights.com)

Overall, shifting from open evaporative to closed-loop, dry, and liquid-based systems offers the strongest path to minimizing consumptive water use while supporting growth. Implementation depends on climate, density needs, and costs, but many proven options exist today. For site-specific advice, factors like local regulations and PUE (Power Usage Effectiveness)/WUE (Water Usage Effectiveness) targets should guide choices.