The Microsoft Fairwater Noise Class Action: 1,000 Households Take On a Hyperscale AI Campus

Microsoft's Fairwater campus in Mount Pleasant, Wisconsin sits in the Racine County corridor originally graded for the Foxconn project, and at 1.2 million square feet it is one of the largest AI data centers in the country. Facilities at that scale move enormous amounts of air and water to keep servers cool, and the mechanical systems that do it run day and night.

In 2026, three residents of Sturtevant, the village next door, filed a class action over the noise. Their complaint frames the sound as a private nuisance: an ongoing interference with residents' ability to use and enjoy their own homes. Rather than suing only over their own three properties, the plaintiffs asked the court to let them represent every household within a 1.5 mile radius of the facility, a class reported at more than 1,000 households.

Per reporting on the filing, no one has ever brought a noise class action against a hyperscale AI data center before. That makes this case, whatever its outcome, the one that every data center operator and every data center neighbor in America now has a reason to watch.

The suit also lands in a state that has become one of the country's busiest data center battlegrounds almost overnight. Wisconsin's build-out now stretches from Fairwater in Mount Pleasant to the Vantage project in Port Washington to development around Beaver Dam, and the courts are filling up alongside the construction sites: the Sierra Club and a residents' group are separately suing over the Port Washington approvals, and Oracle has sued the state's utility regulator over data center power rules. The Fairwater class action is the piece of that wave aimed squarely at what life next to a finished facility sounds like.

The Fairwater suit did not appear out of nowhere. Its legal DNA comes from the crypto mining noise litigation of the last few years, above all the fight in Granbury, Texas. There, Earthjustice filed a private nuisance suit in October 2024 on behalf of residents living near Marathon Digital Holdings' bitcoin mine at the Wolf Hollow power plant, documenting migraines, tinnitus, and sleep loss among more than two dozen neighbors of the site's 24/7 cooling fans. A separate federal complaint by nine Hood County property owners followed in May 2026.

Crypto mines and AI data centers are different businesses with the same acoustic signature: dense racks of hot computers, massive cooling systems, and a hum that never stops. The Granbury cases have been working through exactly the questions the Wisconsin case will face. How do you prove a continuous industrial sound is a legal nuisance rather than an ordinary annoyance? What evidence ties health effects like sleep loss to a specific facility? Can a court order a running facility to quiet down or shut down? Every answer the Texas courts produce becomes persuasive material in Wisconsin, which is why our full write-up of that litigation, the Granbury noise lawsuits, is the essential companion to this case.

The proposed class definition is geographic: everyone within a 1.5 mile radius of the Fairwater facility. If the court certifies a class along those lines, membership generally works like this:

• You do not need to sign up to be included. In a typical opt-out class action, everyone who fits the definition is automatically a member once a class is certified. You would receive formal notice explaining your rights.
• You can opt out. Residents who want to preserve their own individual claims, for example because their property sits closest to the facility or their damages are unusually severe, can exclude themselves and sue separately.
• Any settlement or judgment binds the class. Members share in whatever relief is won, whether that is money, an injunction requiring noise mitigation, or both, and they give up the right to bring the same claims again.

Certification is not automatic. Microsoft can be expected to argue that noise exposure varies too much from house to house for one case to cover everyone, which is a standard defense in geographic nuisance classes. How the court draws that line will shape every future data center class action. For a plain-English walkthrough of the mechanics, see our guide to how data center class actions work.

Wisconsin has quickly become a data center litigation hot spot, with this case joining the Port Washington lawsuits over the Vantage project up the lake. But the Fairwater class action matters far beyond the state line. Hyperscale AI campuses are being built next to residential neighborhoods across the country, and until now the assumption has been that noise complaints end in mitigation talks, as they did for the Great Oak neighbors of Amazon in Virginia, or in nothing at all. A certified class and a serious damages award would change that assumption overnight.

If you live near an operating data center and the noise is affecting your sleep, your health, or your ability to use your home, the practical steps are the same whether or not a class action ever reaches you. Keep a dated log of the noise and its effects. Note times, conditions, and symptoms. Learn what your local ordinance allows in decibel terms, and review our data center noise lawsuit guide for how these claims are built. Then talk to a lawyer about where you stand, especially if you may fall inside a class area like the Fairwater radius. A free case review can connect you with an independent attorney in our network who handles data center cases in your state and can tell you whether joining a class, opting out, or filing your own claim makes the most sense.