We've Been Here Before: What Data Centers Can Learn From the Water Industry

A case for holding data centers to the same standards farmers and municipalities have lived under for decades.

The water industry has a word for water that doesn’t come back. We call it consumptive use. It means the water is gone, evaporated, or otherwise removed from the local water cycle permanently. It doesn’t refill the aquifer. It doesn’t flow back to the river. It’s just gone.

The data center industry measures water differently. They track withdrawal, meaning how much enters the facility. Think of it like a bank account. When you withdraw money, nobody assumes it’s going back. The question that matters is: how much of what you withdrew gets recycled back into the system so you only have to withdraw it once?

Here’s what consumptive use looks like at data center scale: a single large facility uses up to 5 million gallons of water per day for cooling. That’s enough to fill 250 residential swimming pools every single day. There are approximately 4,000 of those buildings operating in the United States right now, with nearly 800 more under construction.

The AI boom is a water boom. It’s time we talked about it that way.

The Scale Is Hard to Comprehend

Numbers this large tend to wash over people. So let’s start small and build up.

One data center. Five million gallons a day. That’s 250 swimming pools every day from a single building. There are approximately 4,000 of those buildings operating in the United States right now, with nearly 800 more under construction.

Now multiply. The United States currently consumes approximately 17.4 billion gallons of water annually to cool its data centers. By 2028, just two years from now, that number is projected to range from 38 to 73 billion gallons. For context, that upper number represents roughly one-third of all the water Americans use to fill every swimming pool in the country. Every year.

Texas alone is projected to consume 399 billion gallons of water for data centers annually by 2030. That is the same Texas where the southern reaches of the Ogallala Aquifer, one of the great agricultural water reserves of North America, have already declined by more than 200 feet in some areas. The same Texas where Austin homeowners are limited to watering their lawns once a week under Stage 2 drought restrictions, with fines for violations. San Antonio has been under the most severe drought restrictions in its 30-year history since June 2024. Dallas permanently banned daytime lawn irrigation years ago, not as an emergency measure, but as a way of life.

Texas is telling its residents to let their lawns go brown. It is simultaneously welcoming hundreds of data centers with open arms.

This isn’t a future problem. The construction is happening right now. Tech companies invested $375 billion in new data center infrastructure in 2026, rising to $500 billion in 2027. Every one of those facilities needs water. Enormous amounts of it. And most of them are being built in places that can least afford to give it.

Withdrawal vs. Consumption: The Word That Changes Everything

When a data center operator says their facility withdraws water, they are being technically accurate. Water enters the cooling system. Some of it does go back. But here is what that measurement leaves out, and it is the part that matters most.

The dominant cooling method in data centers today is evaporative cooling. Water absorbs heat from the servers, then that heat is released into the atmosphere through evaporation. It works extraordinarily well. It also means that approximately 80 percent of the water withdrawn simply disappears into the air, permanently removed from the local water cycle. It does not recharge the aquifer. It does not flow back to the river. It evaporates. That is consumptive use, and it is exactly how irrigation professionals and water managers have measured water loss for decades.

For most data centers today, the recycle rate is roughly 20 percent. That means for every 10 gallons withdrawn, eight vanish into the sky. The other two that do come back are not clean water either. Cooling water returned to the supply carries higher concentrations of dissolved solids, including calcium, chloride, and silica, that can affect drinking water quality, reduce crop yields, and harm aquatic ecosystems.

A 20 percent recycling rate is not water management. It is water mining. And the industry is doing it at a scale that is about to collide with some of the most water-stressed communities in North America.

The Geography Problem Is the Real Problem

Here is something the water industry has understood for generations that the tech industry is only beginning to confront: it doesn’t matter how efficiently you use water if you’re using it in the wrong place.

A farmer in the San Joaquin Valley managing drip irrigation on half an inch of allocation knows this. A water manager in Phoenix rationing Colorado River allocations knows this. A landscape contractor in Las Vegas designing to the Southern Nevada Water Authority’s strict water budget knows this. Location is destiny when it comes to water.

So where are the data centers being built?

Virginia and Texas are the two largest data center markets in the country, and they sit at opposite ends of the water stress map, yet share the same absence of mandatory water consumption reporting. Virginia’s Data Center Alley already holds nearly 35 percent of global data center capacity and sits in a region where groundwater levels have been declining for decades. Texas, the fastest-growing market, is telling its residents to let their lawns go brown while welcoming hundreds of new facilities with open arms.

An assessment of more than 9,000 data center facilities worldwide found that nearly 45 percent face high water-stress exposure by the 2050s. Many aren’t waiting until the 2050s to feel it. They are drawing from the same municipal systems, the same aquifers, and, in some cases, the same water-rights pools that agriculture has been managing and fighting over for a century.

This is familiar territory for anyone in the irrigation industry. We have been navigating water allocation battles, junior-versus-senior water rights, and drought curtailments for generations. Data centers are a new and enormously powerful player entering that same arena, backed by trillion-dollar balance sheets, significant political influence, and the full momentum of the AI boom.

The question is not whether data centers and agriculture will compete for water. In many regions, they already are. The question is whether anyone will require data centers to play by the same rules everyone else has lived under for decades.

What Good Looks Like and Why It Matters That It Already Exists

This is the part the doom-and-gloom coverage usually skips. So let’s be clear: the technology to solve the data center water problem is not theoretical. It exists today. It is operating at scale in some of the world’s largest facilities. The question is not whether it can be done. The question is why it isn’t being required everywhere.

Recycled and Reclaimed Water

The single most important shift available to the industry right now doesn’t require new technology at all. It requires a different water source. Several major operators are already proving it works.

Amazon Web Services now cools data centers across Virginia using treated municipal wastewater, water that would otherwise be discharged into waterways. In fact, AWS became the first data center operator in Virginia approved to use recycled water with direct evaporative cooling systems, reducing water usage by up to 85 percent compared to conventional methods. After cooling the servers, the water returns for re-treatment and reuse. Amazon plans to expand this model to more than 120 facilities by 2030, saving an estimated 530 million gallons of fresh water annually. That is real. That is significant. And it is a model that should be the baseline requirement for every new facility built in a water-stressed region, not a voluntary commitment from one operator.

This is not a new idea to anyone in the water industry. Recycled water has been used for landscape irrigation, agricultural applications, and industrial cooling for decades. The infrastructure exists in most major metros. The regulatory frameworks exist. What has been missing is the requirement to use them.

Closed-Loop Cooling Systems

Conventional evaporative cooling loses 80 percent of its water to the atmosphere. Closed-loop systems recirculate the same water continuously, dramatically reducing that loss. The numbers are not theoretical. Vantage Data Centers operates a closed-loop campus in Wisconsin that uses approximately 22,000 gallons of water per day. A comparable facility using evaporative cooling would use 5 million gallons per day. Same size building. One uses the daily water consumption of 65 homes. The other uses the equivalent of a small city. That is what closed-loop cooling actually delivers, and it exists right now.

Immersion Cooling

This is where the technology is heading, and the water savings are most dramatic. In immersion cooling, servers are submerged directly in a thermally conductive but electrically non-conductive liquid. The liquid absorbs heat directly from the chips with no evaporation, no cooling towers, and no water loss to the atmosphere. Water consumption drops by 90-95% compared with conventional evaporative systems. Several hyperscale operators are deploying immersion cooling in new AI-optimized facilities right now. It is more expensive up front. It is also the future, and the water math makes the case for it better than any engineering argument could.

Zero-Water Evaporation Design

Microsoft has gone further still. Beginning in August 2024, every new Microsoft data center design uses chip-level cooling technology that circulates water through a closed loop, eliminating evaporation entirely. No cooling towers. No water lost to the atmosphere. Each facility built to this standard avoids more than 125 million liters of water consumption per year. The technology is currently being piloted in Phoenix, Arizona, one of the most water-stressed cities in North America. If Microsoft can build zero-water data centers in Phoenix, the argument that it can’t be done anywhere is finished.

The Policy Is Already Being Written

Some states are not waiting. Santa Clara County in California now requires new data centers above certain capacity thresholds to use recycled water for cooling. Virginia conditions state grant funding on the use of treated wastewater rather than potable water. South Carolina and Kansas are advancing legislation mandating cooling technologies that don’t rely on water evaporation. At the federal level, a bipartisan bill called the Advancing Water Reuse Act would establish a 30 percent tax credit for data centers that replace freshwater with recycled municipal water. The framework is being built. The question is whether it will move fast enough to keep pace with 800 new facilities currently under construction.

The Bottom Line on Solutions

Agricultural irrigation withdrawals in the United States dropped more than 20 percent from their peak, even as irrigated acreage grew, not because operators volunteered to do it, but because smart technology became accessible, incentives made adoption practical, and regulation set the floor everyone had to meet. Data centers need the same framework. The technology is ready. The models are proven. What is needed now is the policy will to require them.

The Transparency Gap: You Can’t Manage What You Don’t Measure

Anyone who has worked in water management knows that sentence. It is the first principle of conservation. You cannot reduce what you are not tracking. You cannot regulate what is not reported. It is why agricultural water users file reports. It is why municipalities publish consumption data. It is why irrigation audits exist.

Data centers are largely exempt from that principle at the federal level. There is no national requirement for data centers to disclose how much water they consume. A handful of states are beginning to act, with Minnesota establishing water permitting requirements in 2025 and California, Iowa, and Michigan considering reporting bills. But the majority of states have nothing in place. And in most communities, residents have no idea how much water a proposed facility will use until after permits are approved and construction has begun. By then, the conversation is over.

Consider what that looks like on the ground. A Meta Data center in Newton County, Georgia, uses 500,000 gallons of water per day, representing roughly 10 percent of the entire county’s water consumption from a single building. The county is now on track to face a water deficit by 2030, with water rates already set to surge by 33 percent. Meanwhile, the county is reviewing permit applications from companies requesting up to 9 million gallons of water per day, the equivalent of 30,000 households. Residents learned about it after the fact. They had no seat at the table when it mattered.

This is not an isolated case. It is the norm.

Agricultural water users in the western United States have operated under mandatory reporting requirements for generations. In California, water rights holders file detailed reports with the State Water Resources Control Board. In Colorado, every drop diverted from a stream is recorded under the prior appropriation doctrine. Farmers, irrigation districts, and municipalities have all accepted that water use is a public matter because water is a shared resource.

Data centers should be held to the same standard. Mandatory water consumption reporting as a condition of permitting is not a radical idea. It is the baseline accountability that every other major water user already accepts.

Your Water. Their Servers. Time for New Rules.

Let’s bring this home.

The data center industry is not the enemy. The infrastructure they build powers tools that genuinely improve lives, from precision agriculture platforms that help farmers manage irrigation more efficiently to AI models that help water utilities predict pipe failures before they happen. Technology and water conservation are not opposing forces. They can and should work together.

But good intentions are not a water management strategy.

The irrigation industry spent thirty years proving that dramatic water savings are achievable without sacrificing productivity or quality of life. We did it with smart technology, tiered pricing, mandatory efficiency standards, and relentless measurement. We did it because the alternative, running out of water, was not acceptable. The data center industry is arriving at that same reckoning. The difference is they are arriving with far more political leverage, far less regulatory oversight, and a growth trajectory that makes the irrigation boom of the 1990s look modest.

Here is what needs to happen, and none of it requires waiting for new technology.

Mandatory water consumption disclosure as a condition of permitting. If you want to build in a water-stressed region, the community has a right to know exactly what you are taking and what you are giving back.

Recycled and reclaimed water requirements for new facilities in drought-designated regions. The infrastructure exists. The regulatory framework exists. Make it the starting point, not the gold star.

Consumptive use standards, not withdrawal standards. Measure what doesn’t come back. That is the number that matters. That is the number the irrigation industry has always used. It is time the data center industry used it too.

The technology to do all of this right already exists. The models are proven. The water is not unlimited.

The AI boom is the story of our era. Water is the resource that will determine whether it is sustainable. Those of us who have spent careers in water management have been saying for a long time that the next great resource conflict will be fought over water, not oil, not rare earth minerals, not bandwidth.

We weren’t wrong. We just didn’t know the data center would be the one sitting across the table.

H2O Trends | Richard Restuccia | h2otrends.com

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