Cooling Water Supply and Reuse Lines for Texas Data Centers

A cooling tower can evaporate thousands of gallons on a hot afternoon, and in Texas the question of where that make-up water comes from has become part of siting. A chilled-water plant with evaporative cooling towers loses water continuously to evaporation and blowdown, and the make-up must arrive on a line sized for peak summer demand. A plant that uses air-cooled chillers or dry coolers needs far less, but pays for it in power. Neither answer is right for every site, and the supply line is where the choice becomes physical.

Data Center Builders of Texas builds the pipes, valves, pumps, storage tanks and metering that connect a site to its water source, and the reuse lines that return or recycle water inside the campus. That includes the tap and meter at the utility main, the domestic and fire service, the make-up line to the cooling plant, the connection to a reclaimed-water main where one exists and the drain and blowdown lines that leave the plant.

We start from the thermal design, because the plant's peak demand sets pipe sizes, tank volumes and pump heads. Then we check what the local utility can deliver. A gap between the two, such as a utility main that cannot support peak make-up, is the single most common reason we recommend on-site storage, a second source or a different cooling approach before the design is locked.

The supply scope covers the utility tap, backflow protection, the water meter vault, the main line to the plant and the fire protection loop. We install ductile iron, PVC or HDPE pipe according to the design, restrain joints, test pressure and disinfect domestic lines before they go into service. Where reclaimed water is used, the pipe is marked and colored per regulation, and cross-connection controls keep it separate from drinking water.

On site we build storage as required, whether a ground tank, a concrete cistern or a lined pond, with fill and overflow lines, level controls and pump stations. Storage acts as a buffer for a short supply interruption and as the reserve that lets the plant keep running while a utility repairs a main. We also build the blowdown and discharge lines to the permitted outfall, or to a sanitary sewer connection where that is allowed.

The state has begun to treat water supply as a funded priority. Texas voters approved Proposition 4 on November 4, 2025, directing up to $1 billion a year from existing sales tax revenue, starting in 2027, to water supply projects including desalination, pipe repair, reuse, conservation and permitted reservoirs, roughly $20 billion over two decades under the Texas Water Development Board. Transfers happen only when sales tax collections exceed $46.5 billion in a given year, so the funding depends on the economy.

For a data center buyer, that policy signal points toward reuse. Reclaimed water, municipal effluent and recycled process water are all easier to defend to a utility than a draw on a stressed potable source. Groundwater rules also vary: the Harris-Galveston Subsidence District, created by the Legislature in 1975, regulates groundwater withdrawal in Harris and Galveston counties, which means a well is not an easy answer in the Houston area. In Lewisville, water makes up about 14% of the city area, and a lake source is a different permitting path than a well.

A large water user needs an agreement with the utility before construction, and that agreement may set peak draw, minimum pressure, backflow rules and metering. For wells, a groundwater district permit is required where a district has jurisdiction. For discharge, the Texas Commission on Environmental Quality oversees permits for wastewater, and many cities regulate industrial discharge to the sewer through their own pretreatment programs.

We list these approvals in the first schedule and track them as hard milestones. A utility agreement is often the slowest item in the whole project because it depends on capacity studies and sometimes on main extensions that the utility must fund or schedule. Our permitting and utility interconnection team carries water on the same tracker as electric and fiber.

Hyperscale and AI operators ask the hardest questions about water, since their heat loads are the largest and their sites often sit on the edge of utility service areas. Hyperscale cloud providers and AI and GPU cloud operators often want the plant's water footprint settled early, because it affects public approvals and community response.

Enterprise and colocation buyers tend to ask more about reliability, a second source and the ability to ride through a main break. Whichever the buyer, we offer a straightforward comparison of options: evaporative with storage, air-cooled with higher power, or a hybrid. We lay out the infrastructure each requires and what it costs, and leave the choice to the owner and the thermal designer.

Distance to the main is the first driver, since pipe, trenching, road crossings and restoration scale with length. Pipe diameter and material come second. The third is storage, which can cost as much as the supply line when a site must hold days of make-up, and the fourth is treatment, such as filtration and chemical dosing, if the source water needs it.

Off-site work is the usual surprise. The utility may require a main extension, a booster station or a looped connection before it will commit to the flow, and those costs are often assigned to the developer. We ask the utility for its capacity letter during preconstruction and estimating, so the number in the budget includes what the utility will require and not just what the drawings show.

Tell us the plant's expected make-up demand and the nearest main, and we will price the supply, storage and reuse lines with the utility's requirements noted. We can also compare cooling approaches so the water decision is made on real numbers.

Can a Texas data center use reclaimed water for cooling?

Often yes, where a reclaimed main is nearby or can be extended. Reclaimed water needs distinct piping, labeling and sometimes added treatment for scale and biological control. The utility's availability and rules decide feasibility, so ask the utility early and in writing.

Do we need a well?

It depends on groundwater rules in the area. Some districts, like the one in Harris and Galveston counties, restrict withdrawals, and others have their own permits and spacing rules. A well can be a backup but is a poor sole source unless the aquifer and the permit support it.

How much storage should we plan?

Storage is set by how long the plant must run if supply is interrupted and by the operator's reliability target. We build storage to the design volume and make sure the fill lines can replenish it within an acceptable time. If your target is a day or more, plan land and budget for it early.

What about freeze protection and heat?

Texas winters can freeze exposed piping, and summers drive peak demand. We bury lines to the depth the design specifies, insulate and heat-trace exposed runs, and drain or protect equipment as required. Testing includes a winter-readiness check where the season allows.

Can this scope be bundled with the chiller pads?

Yes. The supply line ends at the plant, and the plant sits on a pad we also build, as described in our chiller and cooling plant pads work. Bundling saves a mobilization and removes a seam where schedules otherwise slip.