Water infrastructure challenges in data centers

14 October 2025
Tiempo de lectura : 6 Minutes

As demand for data infrastructure skyrockets, water emerges as a critical design constraint—one that’s too often overlooked until it’s too late

In the race to build the digital backbone of the global economy, data centers have proliferated at an unprecedented pace. Massive campuses are now rising in regions once considered too remote or infrastructure-poor for high-tech development. While much attention has been paid to securing utility power and fiber connectivity, long considered the two cornerstones of site selection, another infrastructure factor has quietly become a critical bottleneck: water.

Unlike power and fiber, water usage at a data center isn’t fixed, it depends heavily on the type of cooling system employed. And yet, that very dependency means water availability, treatment, and disposal can quickly become deal-breakers for otherwise promising sites. For developers, planners, and municipalities alike, understanding the full lifecycle of water use, from sourcing to discharge, is now essential for resilient, efficient data center design.

Cooling Strategies and the Role of Water

Cooling is the largest non-IT energy consumer in most data centers, and heat rejection is critical to both uptime and equipment reliability. Operators generally have two main approaches, each defined by a trade-off between water and electricity use.

Air-cooled chillers do not require on-site water but consume significantly more power, sometimes as much as twenty percent more than water-based systems. By contrast, water-cooled chillers and direct evaporative systems use much less electricity but rely heavily on water. Because water is typically an order of magnitude cheaper than electricity, many facilities favor water-based cooling when supply is available, particularly at large campuses with high compute density.

Even when a site chooses air-based systems, water still plays an indirect role. Most electricity generation, especially from fossil fuel and nuclear power plants, depends on water for cooling. Whether used directly at the site or indirectly through the grid, water remains an integral part of every data center’s cooling strategy.

Site Selection and Water Realities

As data centers are increasingly developed outside major urban areas, site selection often runs into infrastructure limitations. Remote locations provide lower land costs and more space for large campuses, but they frequently lack the municipal capacity needed to support such facilities. Water supply is a particularly common challenge.

At some sites, engineers find undersized mains, low pressure, or insufficient flow that limit both operations and fire protection capacity. In many cases, new data centers must install dedicated fire water storage because the local system cannot deliver enough volume during an emergency. When the design also relies on water-intensive cooling, the gap between demand and available infrastructure becomes much greater. In some situations, entire new transmission mains measuring eighteen or even twenty-four inches in diameter must be constructed to meet projected water needs. Projects of this scale bring significant costs, additional permitting requirements, and long-term coordination with municipalities.

Richard Donaldson

Estados Unidos

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Water Supply Drives Cooling Choices

Because water availability varies greatly from site to site, it often determines which cooling strategies are viable. A location with limited flow and pressure may require the use of air-cooled systems, even though they consume more electricity. Where a reliable and abundant supply is present, water-based cooling can provide higher efficiency and allow for denser compute loads.

In practice, developers and planners must balance water use against power demand. Choosing a low-water option may preserve limited supply but increase electrical consumption to the point where it constrains overall capacity. Conversely, prioritizing energy efficiency through water-intensive cooling requires robust infrastructure that may not be feasible at every site. When these considerations are addressed early in the design process, it becomes far easier to achieve the right balance between operational capacity, efficiency, and long-term resilience.

Discharge and Disposal: The Other Half of the Equation

Sourcing water is only half the challenge. Managing what remains after cooling is just as important. Both water-cooled chillers and direct evaporative systems depend on evaporation, which leaves behind water with elevated concentrations of dissolved solids. Over time, these solids accumulate to levels that make treatment or reuse difficult and costly. The result is that much of this concentrated water, known as blowdown, must be discharged.

Disposal of this water brings its own set of issues. Municipal sewer systems often require permits for high-volume or high-salinity effluent, and local treatment plants may impose strict limits on what can be accepted. To avoid unnecessary sewer charges, many facilities now meter both incoming water and cooling tower discharge separately so that they are billed only for the water that actually enters the sewer system rather than for the portion lost through evaporation.

Although blowdown water can theoretically be treated for reuse, in practice the chemistry and cost make this approach difficult to justify on a large scale. Until more economical treatment options are available, data centers that rely on evaporative cooling will need to account for significant discharge management as a permanent part of their water strategy.

Water Infrastructure is No Longer Just Plumbing

Gone are the days when mechanical engineers could manage all aspects of water system design. Today’s high-demand campuses require hydraulic modeling, municipal-scale pipe sizing, and regional watershed impact assessments that are all outside the typical scope of mechanical and electrical (MEP) disciplines.

Projects now often require hydrologists, civil engineers, and regulatory specialists to work in parallel with traditional MEP teams. That includes evaluating the ability of a local aquifer or treatment facility to support the site long-term, performing fire flow simulations, and even assisting with permitting for new mains or storage infrastructure.

Water has become a site-defining constraint, not just an afterthought. And because water systems are deeply embedded in the local context, unlike power which can sometimes be imported at a premium, it’s critical to engage technical experts early in the process.

Strategic Planning Starts at the Beginning

Water considerations cannot be bolted on at the end of a design process. They must be integrated from the outset, ideally during site evaluation and master planning. Early trade-off analysis between power and water, infrastructure build-out, and long-term operational flexibility can prevent costly missteps.

What starts as a question of “can we cool this efficiently?” quickly becomes “can we get the water to do it, and where will it go after?”

As data centers continue to scale and spread, particularly into regions experiencing water scarcity, these questions will only grow in urgency and complexity. Industry stakeholders, from developers to municipalities, must recognize that water is not an infinite or free-flowing resource. It’s a limiting factor that directly influences site feasibility, operational efficiency, and long-term resilience.

Addressing these challenges requires more than basic utilities planning; it demands thoughtful, multidisciplinary engineering from the earliest stages of site selection through to system design and permitting. We bring the specialized expertise needed to navigate this terrain—combining hydrological analysis, water stewardship programs, infrastructure modeling, and data center systems design to ensure water constraints are understood, planned for, and strategically managed. Whether evaluating multiple sites, optimizing cooling trade-offs, or coordinating with municipal systems, clients need this valuable information to make critical decisions that align with both operational goals and resource realities.