Meta data center discharge halted over rare bacterium
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- The Cheyenne Board of Public Utilities revoked fill-and-flush discharge privileges for Meta contractor Goat Systems LLC on March 24, finding the firm in "significant noncompliance" for discharging water carrying Cupriavidus gilardii, a metal-resistant bacterium that interfered with two water reclamation plants and pushed the reuse system offline for months of cleanup.
- Goat Systems purchased fill water from the Board itself and routed flush water from the data center's closed-loop cooling commissioning into the sanitary sewer; lab staff caught the bacterium in February during routine fecal-bacteria sampling, per engineering manager Frank Strong, who told the Wyoming Tribune Eagle, "This isn't something we normally test for."
- Meta general contractor Fortis stopped discharging and began hauling wastewater offsite, and independent testing found no trace of the substance, according to Meta; testing at the Dry Creek and Crow Creek facilities cleared in late June, putting the reuse system back online.
- Cheyenne City Councilman Pete Laybourn called the disclosure "a very, very unpleasant surprise," and the Board has not said how the suspension affects other Cheyenne data centers still under construction.
- The Board's concerns extend beyond the bacterium: closed-loop systems can carry glycol and other chemicals that municipal treatment plants aren't built to process, and because Cheyenne sprays its reclaimed water on parks and golf courses, the Board worried the bacterium could become an aerosol hazard during irrigation.
- Microsoft and Nvidia market sealed liquid loops as a near-zero-water cooling alternative—Nvidia's Rubin platform runs a 75% water, 25% propylene glycol coolant—but the one-time fill step that produces a discharge happens before the loop is sealed, undermining the "zero-water" pitch during commissioning.
Why it matters: The incident exposes a gap in the "near-zero-water" closed-loop cooling pitch that Microsoft and Nvidia market to AI data center communities: the commissioning flush is precisely where the discharge occurs. For Cheyenne, the suspension now extends to every data center connected to city services, and the Board is silent on how it affects projects still under construction.
