US datacenter operators are under mounting scrutiny over what flows out of their facilities as well as how much water they draw in, according to a report published 10 September that documents enforcement actions, permit fights and a threatened lawsuit across at least six states (The Guardian). The report cites rare-bacteria findings at a Wyoming campus, Virginia permit violations, stormwater flooding in West Virginia and a planned lawsuit in Georgia over alleged metals discharges.
Key takeaways
- Cheyenne, Wyoming officials stopped accepting wastewater from contractor Goat Systems working on Meta's $800m, 960-acre AI campus in July after detecting the rare bacterium Cupriavidus gilardii in 801,000 gallons of discharge; Meta disputes the test (The Guardian).
- Flint Riverkeeper says it will sue the QTS datacenter in Fayetteville, Georgia for allegedly discharging dirt and metals into the Flint River over the past two years (The Guardian).
- 55 Waterkeeper Alliance affiliates are working on datacenter issues, with 80% of campaigns focused on pollutants in discharged water (The Guardian).
- Authorities in Virginia have brought enforcement actions against several datacenters for wastewater and wetland permit violations, and stormwater runoff from an incomplete West Virginia datacenter has twice flooded surrounding houses (The Guardian).
- Critics want a discharge-temperature cap: heated water from a gas-fired facility pivoting from crypto mining to AI could be released at 108F (42C) into Lake Seneca, where trout stress begins at 70F (21C) (The Guardian).
What happened
Wyoming: rare bacterium triggers a discharge shutdown
During a routine test on water being discharged from Meta's under-construction AI datacenter campus in Cheyenne, Wyoming, city officials found the rare and potentially hazardous bacterium Cupriavidus gilardii in 801,000 gallons of water ejected earlier this year by the contractor Goat Systems (The Guardian). The water was destined for sewer, not drinking supply, but concern that residents could be exposed through evaporating droplets from irrigation reuse led the board of public utilities to stop accepting the wastewater in July; the contractor is now appealing that decision (The Guardian). "It was a big surprise," said Frank Strong, water resources manager at the city's board of public utilities, about the discovery. "Out of a sense of caution we've shut it down until we can find out more information" (The Guardian). Meta, which is behind the $800m, 960-acre campus, said independent testing by its contractor found no evidence of the bacterium and questioned the validity of the city's tests, while a company spokesman added: "Meta is committed to being a good neighbor in Cheyenne, which includes helping protect local water resources" (The Guardian).
Enforcement actions and a threatened lawsuit
The Wyoming incident is part of a wider pattern. In Virginia, authorities have brought enforcement actions against several datacenters for wastewater and wetland permit violations, and in West Virginia, stormwater runoff from an incomplete datacenter has twice flooded surrounding houses, the report says (The Guardian). In Georgia, Flint Riverkeeper has said it will sue the QTS datacenter in Fayetteville for allegedly ejecting "massive amounts of dirt [and] massive concentrations of metals" into the Flint River over the past two years (The Guardian). A Waterkeeper Alliance spokeswoman said datacenters have been documented as sources of "a wide range of toxic pollutants, including Pfas, heavy metals and antibiotic-resistant bacteria" (The Guardian).
Heat, chemicals and the cooling-water debate
The report notes that after water is used for cooling or, as at the Meta site, for "fill and flush" pipe cleaning, liquid is discharged back for reuse under pretreatment permits set by counties or local wastewater utilities, and that this stream can carry heavy metals or Pfas from "closed loop" cooling systems (The Guardian). Critics of a gas-fired facility pivoting from crypto mining to AI, which draws water from Lake Seneca, point to a possible 108F (42C) discharge temperature ("It's going into a trout stream, where trout are stressed at temperatures of 70F (21C) or higher"), according to Yvonne Taylor, vice-president of Seneca Lake Guardian and president of the National Coalition Against Cryptomining (The Guardian). Vulcan Infrastructure and Power, which is behind the revamped facility, has previously stressed it has complied with all relevant environmental laws, the report adds (The Guardian). New York has issued a temporary moratorium on huge, hyperscale datacenters, and Taylor claimed there was swelling support for a national pause (The Guardian).
| Location | Reported issue | Reported figure / status |
|---|---|---|
| Cheyenne, Wyoming (Meta / Goat Systems) | Rare bacterium Cupriavidus gilardii detected in fill-and-flush discharge | 801,000 gallons; discharge stopped July; appeal pending |
| Virginia (multiple operators) | Wastewater and wetland permit violations | Enforcement actions brought |
| West Virginia (incomplete datacenter) | Stormwater runoff flooding | Two flood events reported |
| Fayetteville, Georgia (QTS) | Alleged metals and sediment discharges into Flint River | Lawsuit threatened by Flint Riverkeeper |
| Lake Seneca, New York (Vulcan facility) | Heated cooling water to trout stream | Reported discharge 108F (42C); trout stress at 70F (21C) |
Specification read
The reported 801,000 gallons of fill-and-flush water from the Cheyenne campus is a single episodic volume tied to pipe cleaning on an under-construction site, not steady-state cooling-tower blowdown; converting to operator units, 801,000 US gallons is about 3,034 m³ (general conversion, not from the sources). Steady-state demand is reported separately: "a mid-sized datacenter can consume about 300,000 gallons of water a day," which is roughly 1,135 m³/day for one mid-sized site (general industry range, not from the sources). The contaminant profile the source flags for this wastewater class is heavy metals and Pfas from cooling loops, plus microbial risk from construction and pipe-cleaning water, with discharge governed by county or utility pretreatment permits. The relevant treatment train for fill-and-flush and cooling-tower blowdown at this scale is screening and equalisation, followed by physico-chemical removal of metals and Pfas (typically coagulation/DGF, ion exchange or granular activated carbon, and high-recovery RO where reuse is targeted), biological polishing only if the stream is blended with biodegradable load, and finally disinfection before sewer discharge or reuse. The Wyoming case bears on the front end of that train (source control and discharge acceptance), while the Georgia, Virginia and Lake Seneca cases bear on the metals, solids and temperature controls applied later in the train.
Buyers running a campus or industrial park where pretreatment acceptances are tightening around Pfas, metals and microbiology should be looking at high-recovery RO or ZLD for cooling-tower blowdown, dedicated fill-and-flush handling with biological safety, and tighter heat-rejection design where discharge temperature is a permit trigger. Two related reads for specifiers sizing these stages: ZLD vs High-Recovery RO for Data Center Cooling Tower Blowdown: 2026 Brine Mandate Verdict and MBR vs Conventional Activated Sludge for Mining Wastewater: 2026 Ellwood City Guide. Pretreatment equipment lines for the municipal and chemical side of the plant sit on the Municipal and Chemical hubs.
FAQ
What flow rate should a mid-sized datacenter cooling-tower blowdown system be sized for?
The source reports "a mid-sized datacenter can consume about 300,000 gallons of water a day," or roughly 1,135 m³/day of total make-up; blowdown is a fraction of that, typically a few percent in closed loops, so a single mid-sized site would justify a packaged RO or high-recovery unit in the tens of m³/day range (general industry range, not from the sources). Reported reuse framing is in the source (The Guardian).
Which treatment stages matter most for Pfas and metals in datacenter discharge?
The report flags Pfas and heavy metals as the documented pollutants of concern in datacenter wastewater, with metals specifically called out in the threatened Georgia lawsuit over the Flint River (The Guardian). The standard industrial response is coagulation and media filtration upstream of ion exchange, GAC or high-recovery RO, with brine management handled by ZLD where reuse or disposal is constrained (general industry range, not from the sources).
How quickly can a fill-and-flush discharge acceptance be shut off, and what is the appeal path?
In Cheyenne, city officials halted acceptance in July after the bacterium was detected earlier in 2026, and the contractor Goat Systems is now appealing the decision (The Guardian). For a buyer, the practical signal is that a single failed test can pause discharge; pretreatment skids with redundant monitoring and documented chain-of-custody are a defensible hedge.
Are there any current moratoriums or pause campaigns affecting hyperscale datacenter projects?
New York has issued a temporary moratorium on huge, hyperscale datacenters, and campaigners cited in the report say there is growing support for a national pause; the Waterkeeper Alliance counts 55 affiliates working datacenter issues, with 80% focused on discharge (The Guardian). For procurement, that means longer environmental review windows and stricter pretreatment terms on new bids in affected states.
