Cheyenne Names Meta Contractor Behind Water System Contamination
A bacterium nobody was testing for showed up in Cheyenne's water system in February. It took four months, and mounting public pressure, before the city said who was responsible.
Cheyenne's Board of Public Utilities named Goat Systems LLC, the contractor Meta uses to build its Cheyenne data center campus, as the source of a discharge that introduced the bacteria Cupriavidus gilardii into the city's wastewater treatment system.
How the Contamination Happened
Goat Systems discharged fill-and-flush water into the city's sanitary sewer, and that water already contained the bacterium when it arrived.
Fill-and-flush is a commissioning step where crews fill a cooling loop's piping with water, flush it to clear construction debris, then drain the used water.
BOPU engineering manager Frank Strong said the board doesn't know where the bacteria originated, only that the water Goat Systems discharged carried it, and that water had itself been purchased from the utility.
Lab staff caught the contamination in February during routine fecal-bacteria testing, not a test specifically designed to catch this organism.
"This isn't something we normally test for," Strong said.
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Why It Took Months to Name a Company
BOPU revoked Goat Systems' industrial discharge privileges for the operation on 24 March, but didn't publicly identify the company until this week's notice.
Cheyenne City Councilman Pete Laybourn called the disclosure "a very, very unpleasant surprise."
A local resident and House District 9 candidate had specifically pushed BOPU to release the contractor's name in the days before the announcement finally came.
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What the Bacteria Actually Does
Cupriavidus gilardii occurs naturally in soil and water and typically lives harmlessly in the environment, according to the National Institutes of Health.
It can occasionally act as an opportunistic pathogen, meaning it mostly threatens people who are already sick or immunocompromised.
BOPU's concern centered on Cheyenne's reclaimed water program, which sprays treated wastewater on parks, golf courses and other green spaces — officials worried the bacterium could become airborne during irrigation and expose people nearby.
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The Response Goes Beyond One Contractor
BOPU suspended acceptance of industrial wastewater from all data center fill-and-flush and closed-loop cooling operations across the city, not just Meta's project, while it evaluates how to prevent future incidents.
Testing at the Dry Creek and Crow Creek treatment facilities cleared in late June, and the reclaimed water system is back online.
A Meta spokesperson said the company is supporting its general contractor, Fortis, and that independent testing has found no trace of the bacterium.
The Bigger Pattern This Fits
Cheyenne's episode lands amid a broader wave of local pushback against AI data center construction across the US, with cities increasingly debating limits, zoning restrictions and even outright bans as water and power demands from AI infrastructure grow.
Meta's Cheyenne campus is part of an approximately $8.3 billion buildout expected to host roughly 251,000 H100-equivalent AI chips, supported by 220 megawatts of power — a scale that makes Cheyenne's regulatory response a live test case for how smaller cities manage the physical footprint of AI expansion.
Microsoft and Nvidia both market closed-loop cooling systems as a near-zero-water alternative to older evaporative methods, but Cheyenne's experience shows that even sealed systems still generate commissioning wastewater that has to go somewhere.
TL;DR
- Cheyenne named Goat Systems LLC, a Meta contractor, as the source of bacteria found in its water system.
- The bacterium, Cupriavidus gilardii, was discovered during routine testing in February but only publicly attributed this week.
- BOPU suspended all data center wastewater discharges from fill-and-flush and closed-loop cooling operations citywide.
- Meta's Cheyenne campus is part of an $8.3 billion AI data center buildout.
- Testing has since cleared, and the city's reclaimed water system is back online.
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Technology Reporter
Priya Nair writes about emerging technologies, cybersecurity, and the intersection of tech and society. She keeps a close eye on Silicon Valley and the global startup scene.
