The massive cooling towers at xAI’s Colossus supercomputer facility in South Memphis were supposed to come with a safeguard: a closed-loop water-recycling system designed to treat and recirculate millions of gallons a day, limiting how much the operation would pull from the Memphis Sand Aquifer. That system is not running. And as of spring 2026, no public timeline exists for when it will be.
Without the recycling infrastructure, Colossus draws fresh water directly from the aquifer for its evaporative cooling needs. The Memphis Sand Aquifer is one of the largest artesian systems in the world and the sole drinking water source for roughly one million people across the metro area. Memphis Light, Gas and Water, the public utility that manages aquifer access, pumps approximately 180 to 200 million gallons per day to serve the region. A single facility permitted to intake up to 13.5 million gallons daily would represent a significant new claim on that supply.
What the permit filings show
The Tennessee Department of Environment and Conservation, known as TDEC, accepted a permit application (State Operating Permit SOP-24025) filed by CTC Properties LLC on behalf of xAI’s data center. According to TDEC’s public notice, the proposed water-reuse system would intake up to 13.5 million gallons per day from the aquifer and produce up to 13 million gallons per day of treated water for industrial evaporative cooling. The permit specifies no discharge, meaning every gallon pulled from the aquifer would be consumed on site through evaporation rather than returned to any waterway or treatment plant.
TDEC scheduled a public hearing on the permit for June 25, 2025. As of May 2026, no public record confirms whether the hearing resulted in an approval, denial, or modification of the application. TDEC has not published an updated status for SOP-24025 in its online docket, and neither xAI nor CTC Properties LLC has issued a statement explaining why the recycling system remains inactive or when construction might resume.
The recycling system was the centerpiece of xAI’s pitch to regulators that Colossus could operate at scale without overtaxing the aquifer. By treating and recirculating wastewater internally, the system was designed to cut the net volume the facility would need from the public supply. With that system on hold, the conservation benefit the permit was supposed to deliver has not materialized, and the facility’s cooling towers rely entirely on fresh groundwater.
Legal pressure on a second front
The water situation is not the only regulatory challenge facing xAI in Memphis. In 2025, the NAACP and the Southern Environmental Law Center filed a 60-day notice of intent to sue the company under the Clean Air Act, citing pollution from the Colossus facility. Associated Press reporting detailed the notice, which alleged that xAI operated without proper air permits and that the company’s claimed exemption timeline did not hold up under federal law.
A 60-day notice is a required legal step before filing a federal citizen suit. That window closed months ago. As of May 2026, no public court filing confirming a formal lawsuit has surfaced in federal docket searches, and neither the NAACP nor xAI has announced a settlement or resolution. The gap leaves open the question of whether the parties reached an agreement behind closed doors, whether litigation is still being prepared, or whether the matter was dropped.
Some community advocates in South Memphis have speculated that xAI may have slowed its permit applications as a strategic response to the legal threat, choosing to limit its regulatory exposure while the air-quality dispute played out. No on-the-record statement from xAI or its attorneys supports that theory, and no public filing connects the water permit process to the air-pollution dispute. Still, the overlap is hard to ignore: a company facing accusations on two environmental fronts simultaneously has reason to tread carefully with regulators.
What residents still don’t know
The most basic question for Memphis households remains unanswered: how much water is xAI actually using right now? The 13.5 million gallons per day figure represents the maximum the recycling system was designed to handle, not necessarily the facility’s current consumption. Memphis Light, Gas and Water has not released updated usage records specific to the Colossus site, and xAI has not voluntarily disclosed its daily withdrawal figures.
Without that data, neither advocates nor regulators can quantify the gap between what xAI uses today and what it would use with a functioning recycling system. Community groups have relied on worst-case projections based on the maximum permitted intake, which may overstate the current impact but accurately reflect the risk ceiling if the facility scales up to full capacity without recycling in place.
No independent environmental assessment of Colossus’s effect on the aquifer has been published by a government agency or academic institution. The Memphis Sand Aquifer has historically been considered robust, but hydrologists have warned for years that large-scale industrial withdrawals, combined with population growth and climate variability, could strain recharge rates over time. A facility of this magnitude operating without its planned conservation system adds a new variable to that equation.
Where the aquifer question goes from here
For the neighborhoods surrounding the Colossus site, the frustration is concrete. South Memphis communities already shoulder a disproportionate share of the city’s industrial activity, from warehouses to chemical plants. Residents who spoke at public forums in 2025 described the xAI facility as the latest in a long line of projects that promised economic benefits but delivered environmental burdens. The water-recycling pause sharpens that grievance: a system explicitly designed to protect the aquifer is sitting idle, and no one with authority has explained why.
TDEC retains the power to attach conditions to any future permit approval, including limits on intake volumes, mandatory monitoring, and specific conservation benchmarks. Memphis Light, Gas and Water could also impose restrictions on large industrial users if aquifer data warrants it. But neither agency has signaled imminent action, and xAI has shown no public urgency to restart the recycling project.
Residents tracking the issue should monitor TDEC’s permit docket for SOP-24025, watch for any enforcement actions or court filings tied to the Clean Air Act dispute, and press Memphis Light, Gas and Water for facility-specific usage data. Until the recycling system is operational or xAI discloses its actual water consumption, the central tension holds: a critical aquifer serving a million people has a major new industrial user drawing from it with fewer safeguards than regulators were told to expect.
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*This article was researched with the help of AI, with human editors creating the final content.
