Cheyenne Water System Bacteria Issue Sparks Citywide Alert—What Residents Must Do Now

CHEYENNE, Wyo. — The Cheyenne Board of Public Utilities (BOPU) has traced a rare bacterium, Cupriavidus gilardii, to construction water discharged by Goat Systems LLC, a contractor building Meta’s new artificial-intelligence data-center campus on the city’s south side. BOPU staff detected the organism during routine February sampling of the municipal wastewater treatment system. Although the pathogen is naturally found in soil and water, it can infect people with weakened immune systems. To eliminate any public-health risk, BOPU immediately shut down Cheyenne’s reclaimed-water irrigation network, halted the city’s reuse start-up for 2026 and began a weeks-long investigation. Construction crews had been performing a “fill-and-flush” of closed-loop cooling pipes, then pumping the spent water into the sanitary sewer. Testing confirmed that the water already contained C. gilardii before it entered city infrastructure. Meta’s general contractor, Fortis, voluntarily stopped all industrial discharges and began hauling construction effluent off-site for treatment, the company said in an emailed statement to local media. Public-health impact and creek release • Drinking water was never threatened; the organism was confined to the wastewater and reclaimed-water loops. • Some bacteria bypassed treatment and flowed into Crow Creek, but officials call the risk “very low” because people rarely contact creek water directly. • After multiple clean tests at both of Cheyenne’s wastewater plants, BOPU re-started reclaimed-water deliveries to parks and golf courses on 29 June. New policy for data centers To prevent another incident, BOPU has permanently banned industrial discharges from closed-loop cooling and fill-and-flush operations. Future projects must capture and truck that water instead of piping it to the sewer. Existing hyperscale campuses that rely on evaporative cooling are mostly unaffected, but any new phases of Meta’s build that switch to closed-loop technology will need separate holding tanks. Economic ripple effects Cheyenne LEADS, the city’s economic-development arm, emphasized that the contamination occurred during construction, not regular data-center operations. Still, the episode spotlights the balancing act between courting multi-billion-dollar tech investment and safeguarding scarce High Plains water supplies. What happens next 1. BOPU is evaluating whether Goat Systems or Meta will pay for remediation costs. 2. State environmental regulators are reviewing whether additional permits should be required for data-center cooling water. 3. Researchers at the University of Wyoming are sampling nearby waterways to build a baseline data set on C. gilardii in the region. Residents who notice reclaimed-water sprinklers back in operation can be reassured the system has been cleared. Still, officials advise immunocompromised individuals to avoid direct contact with irrigation overspray as an extra precaution. Bottom line: Cheyenne’s water utilities acted quickly to contain a rare bacterium linked to high-tech construction, and the city has now tightened rules to keep future data-center wastewater — and any unwelcome microbes — out of public infrastructure.