Whose water? SpaceX, the river, and the farms downstream

BROWNSVILLE — When Brownsville’s utility board agreed in June 2025 to pipe drinking water to Starbase, it attached a condition that sounds technical and is not. SpaceX would have to “purchase or donate water rights for all volumes required.”

On the Lower Rio Grande, that sentence reaches every farm in the Valley.

The river is run like a bank. The Rio Grande Watermaster, an arm of the Texas Commission on Environmental Quality, keeps accounts for every water right from Fort Quitman to the Gulf. Each month it “determines how much unallocated water assigned to the United States is contained in the Falcon-Amistad system” and credits the accounts. Cities and industries come first. “Priority is given to all municipal accounts,” the agency says, backed by a guaranteed reserve of 225,000 acre-feet. Farms come after. “Irrigation accounts must rely on balances that are carried forward.”

Rights can be bought and sold. The state posts a running list of Rio Grande water rights for sale. When a city or a company needs more, it buys an irrigation right and converts it. The water that used to go to a field goes to a tap, or a launch pad.

An acre-foot is the water it takes to cover one acre a foot deep, about 326,000 gallons. A water right is a permit to take a set number of acre-feet from the river each year. There are only so many. New users don’t get new water; they buy someone else’s right.

A customer with no utility

The utility’s June 2025 presentation described the customer it was about to take on. The SpaceX site “is not located within an active CCN issued by the PUCT and does not receive sufficient retail water service.” SpaceX “requires potable water for its operations and the residents in the area.”

In other words, the newest city in Texas has no water system. Its supply is Brownsville’s, delivered first by tanker truck and now by a pipeline SpaceX will build and own. The utility would widen a segment of its own line to 16 inches using impact-fee money, and phase the trucks out.

How much water SpaceX may take, and which rights it has bought to cover it, is not in any packet the board has published. The presentation says only “all volumes required.”

Two plants and a promise

The land vote on Aug. 29 came with money for water. According to the Texas Tribune, SpaceX agreed to fund a wastewater reclamation project that would add 8 million gallons a day and an expansion of a water plant adding about 10 million gallons a day, with $40 million into escrow and up to $220 million in all. Mayor John Cowen Jr. said the investment would “reduce or completely eliminate our reliance on the Rio Grande River.”

That is a large claim in a basin where the river is the supply. Brownsville’s utility already runs a brackish-groundwater desalination plant through the Southmost Regional Water Authority, a board whose president is Dr. Joseph L. Hollmann, the same director who abstained on both SpaceX votes at the utility. Five days after the city vote, that authority posted a special meeting with a single closed-session item: “Consideration of a Proposal for an Agreement Regarding Expansion of the Southmost Regional Water Authority Water Production Facilities.” Public comments, in writing only, an hour ahead.

SpaceX’s own representative was careful about what the money buys. “We’re not guaranteed any water by [the Brownsville Public Utility Board] through this agreement,” Sheila McCorkle, a company vice president, told the commission, as the Tribune reported.

What it means for the Valley

If the plants are built and the mayor’s claim holds, Brownsville would lean less on the river and more on reclaimed wastewater and groundwater. That would leave more river water in the accounts farms draw from. If SpaceX’s pipeline volumes are large and its water rights come from converted irrigation rights, the effect runs the other way.

Nobody outside the utility and the company can say which, because the numbers have not been released: the pipeline’s volume, the rights SpaceX has acquired, the price, and the terms of the $220 million. The utility’s public information officer has been asked for each.

The next contract is electric

Buried on page 346 of a 368-page board packet in May, the utility proposed a new kind of contract. It would let the general manager negotiate and sign a “Non-Standard Service Agreement” for electricity with any commercial customer whose needs are “not shared by or representative of” ordinary ratepayers. The draft does not say who the customer is. The utility has used the same instrument twice in the past year, for water and for sewer, and both times the customer turned out to be SpaceX.

The language is specific about what such a deal must contain. Each agreement “shall be supported by a documented cost-of-service analysis demonstrating that the customer will pay no less than the full cost of providing service,” and “shall not result in subsidization by current or” other customers. The board must approve it before signing.

The load is coming. At a joint session with the City Commission on Dec. 10, 2024, Mayor Cowen spoke of “preparing the city for future growth, particularly in light of Space X’s plans to increase the frequency of launches and expand manufacturing operations.” General Manager Marilyn D. Gilbert told the same meeting the utility was working on “integrated resource plans, which include assessments of electrical needs and substation requirements.” Starbase has since nominated a “Starship Infrastructure Expansion Project” for state tax benefits and is holding a hearing this week on annexing about 7,133 acres. Manufacturing at that scale runs on electricity. The utility that sells it is Brownsville’s.

Who to watch

The Brownsville Public Utilities Board, at its next regular meeting, where any August agreement would come up for ratification, and where the first electric agreement would arrive the way the water and sewer ones did: named in the packet, passed on consent. The Southmost Regional Water Authority, whose recording of the Sept. 3 meeting is promised on its website. The Rio Grande Watermaster’s sales list, where any transfer of an irrigation right to SpaceX would appear. The cost-of-service study, once one exists, is a public record. It has been requested.

Sources

TCEQ, Rio Grande Watermaster Program; TCEQ, Rio Grande water rights for sale; TCEQ, Rio Grande Watermaster contractual sales; BPUB June 2, 2025 packet, pp. 358–359; SRWA Sept. 3, 2026 agenda; BPUB May 11, 2026 packet, pp. 345–347; Joint City Commission–BPUB minutes, Dec. 10, 2024, p. 3. Existing coverage: Texas Tribune, Aug. 31, 2026.

This series continues when the utility’s contracts are released.