What Actually Happened in Cheyenne

Here’s the short version. Cheyenne’s Board of Public Utilities found a rare bacterium called Cupriavidus gilardii in its wastewater treatment system back in February. It took months of testing to trace the source, and in July, officials confirmed it came from Goat Systems, a contractor working on Meta’s $800 million data center campus. The city pulled the contractor’s discharge privileges and had to take its entire reuse water system offline for cleanup.

To be fair, officials say the bacteria didn’t get into Cheyenne’s actual drinking water. It showed up in the reclaimed water used for irrigation. But residents weren’t told about the contamination until the end of June, months after it was first discovered, and Meta wasn’t publicly identified as the source until July. That gap between discovery and disclosure is exactly what’s making people uneasy, and honestly, it’s a fair thing to be uneasy about.

Why Data Centers Need So Much Water in the First Place

Servers generate a lot of heat, and keeping them from overheating takes a serious amount of water. Most large facilities lean on evaporative cooling because it’s the most energy efficient option, especially in warmer climates. The problem is that this method pulls water directly from a municipal supply, and it doesn’t come back the same way it went in.

There are roughly 5,300 data centers operating in the United States right now, running around the clock, every day of the year. One single AI query is estimated to use about 16 ounces of fresh water once you account for the cooling it takes to process it. Multiply that by the millions of queries submitted daily and you start to see the scale of what we’re talking about.

Where PFAS Fits Into the Picture

This is the part that concerns environmental scientists most. Some data centers use two-phase immersion cooling, where servers sit submerged in a chemical fluid that carries heat away. A lot of those fluids are PFAS based, the same “forever chemicals” linked to cancer, immune dysfunction, and reproductive harm. The EPA determined back in 2024 that there’s no safe level of exposure to certain PFAS compounds.

Chemours, one of the largest PFAS manufacturers in the world and a major supplier for data center coolants, already paid a $450 million settlement over PFAS contamination in the Cape Fear, Delaware, and Ohio rivers. And the company has said it plans to expand PFAS production specifically to keep up with data center growth. According to the Environmental and Energy Study Institute, airborne PFAS emissions from Chemours operations in North Carolina alone have already contaminated more than 7,000 drinking water wells.

There’s currently no single federal law requiring PFAS testing for data center discharge water. Virginia doesn’t require it. Neither does the EPA, at least not yet. That leaves a real gap between how fast these facilities are being built and how much anyone actually knows about what’s coming out of them.

It’s Not Just Wyoming

Cheyenne isn’t an isolated case. In Oregon, an Amazon data center agreed to a $20.5 million class action settlement after its server cooling process concentrated nitrate-heavy wastewater that was then applied to nearby farm fields. That wastewater seeped into groundwater and contaminated wells used by local families, and residents reported health issues including miscarriages, kidney problems, and cancer diagnoses.

In Virginia, residents near a proposed Amazon facility are pushing for PFAS testing on discharge water before permits get approved, something the state doesn’t currently mandate. Community members told the Virginia Mercury that the lack of required testing leaves a genuine information gap about what’s actually flowing into local creeks and rivers.

AI Data Centers and Your Water Supply: Should You Actually Be Worried?

Here’s the honest answer. If you live near a data center, especially one using immersion cooling or discharging directly into local waterways, it’s worth paying attention. If you don’t live near one, the direct risk to your own tap is lower, but PFAS contamination doesn’t stay put. It moves through groundwater, rivers, and soil, and it accumulates over time in the human body rather than breaking down.

That’s really the bigger issue with AI data centers and your water supply. It’s not that every home near a data center is in danger today. It’s that the regulatory system hasn’t caught up with how fast this industry is growing, and homeowners are often the last to find out when something goes wrong. Cheyenne residents didn’t know about their contamination for months.

What You Can Actually Do About It

You can’t control what a data center discharges upstream, but you can control what happens at your own kitchen sink. A few practical steps worth taking:

Check the Environmental Working Group’s tap water database to see what’s already been detected in your local supply. If your water comes from a well, get it tested by an EPA certified lab, especially for PFAS, nitrates, and heavy metals. And if you want ongoing protection rather than a one time check, a home filtration system built to reduce PFAS and other emerging contaminants gives you daily peace of mind that doesn’t depend on waiting for a city notice.

Not every filter handles PFAS the same way. Look for systems that are NSF certified for PFAS reduction, since standard carbon filtration alone isn’t always enough. This is exactly why AquaJoud’s multi-stage systems are built the way they are, to give you real protection at the point where water actually enters your home, not just a false sense of security.