Microsoft Sued: Wisconsin Class Action Targets Noisy Mount Pleasant Data Center
Microsoft is facing a federal class-action lawsuit from three Wisconsin residents who say the constant hum of its newly opened Fairwater AI data center in Mount Pleasant has wrecked their sleep and their property values. The suit, filed Wednesday, July 1, in the U.S. District Court for the Eastern District of Wisconsin, targets a facility Microsoft CEO Satya Nadella has called the “world’s most powerful AI data center.”
Fairwater’s $7.3 Billion AI Supercluster Sits Next to Sturtevant Homes
Earlier this year Nadella touted the $7.3 billion Fairwater campus, describing it as connecting “hundreds of thousands” of power-hungry chips “into a single seamless cluster.” According to Wisconsin Public Radio, a June 18 update on Microsoft’s website said “our engineering team and consultants on-site investigated the source of the sound, conducted tests, and put noise mitigations in place.” Wisconsin Examiner reports the facility spans roughly 1.2 million square feet, and an analysis by Clean Wisconsin found the Mount Pleasant data center, alongside another under construction in Port Washington, is projected to use more energy than every household in the state combined.
Diesel Generators and Cooling Towers Named as Noise Sources
The lawsuit was filed by three residents of the neighbouring village of Sturtevant. PC Gamer, citing court filings via Law360, reports the noise pollution is alleged to stem from “diesel generators and heating, ventilation, and air conditioning (HVAC) systems, including chillers, cooling towers, air-handling units, and condenser fans.” The complaint frames the disturbance in legal terms as ongoing property invasion, arguing that “through its operation and maintenance of the Data Center, Defendant has emitted, and continues to emit, unreasonable and excessive noise onto Plaintiffs’ properties, thereby causing property damages through private nuisance and negligence.”
Notably, the filing goes further than a simple decibel complaint. It argues “although some of the Data Center’s operations generate significant dBA levels from the backup generators, much of the ‘low hum’ noise is low-frequency infrasound that is not detected and reflected in dBA measurements.” PC Gamer notes the suit still cites measured community noise levels between 48 to 60 decibels.
1,000 Homes Could Join the Class, Plaintiffs’ Lawyers Say
The three named plaintiffs are Garret Ostergaard, David Wade and Joy Wade, all of whom live within 1.5 miles of the data center. PC Gamer reports the proposed class covers “all owner-occupants and renters of residential property residing within one and one-half (1.5) miles of Defendant’s Data Center at any time within the applicable statute of limitations,” a group attorneys estimate could ultimately include about 1,000 homes within a mile and a half of the facility.
The personal toll described in the complaint is stark. Wisconsin Examiner reports the excessive noise from the data center forced Ostergaard to change his work schedule from third to second shift because he couldn’t sleep. Fellow plaintiff Amy Cimbalnik, quoted by Futurism, said the facility emits a noise “similar to the whirring engine of a freight train parked nearby” around the clock, adding, “We heard it 24 hours a day, and eventually realized it was coming from the Microsoft campus.”
Microsoft Points to April Fixes, Village Reports No New Complaints
Microsoft has acknowledged the lawsuit without disputing its existence. A company spokesperson told reporters, “Microsoft is committed to being a good neighbor in the communities where we build, own, and operate our datacenters.” The company says engineering adjustments made in April addressed an earlier “tonal humming” problem, and that independent monitoring backed up the fix.
Local officials appear to agree the April changes had an effect. Mount Pleasant communications director Sean Ryan said, according to WPR, “the Village has received no formal complaints relating to Microsoft’s properties since the company completed the adjustments that were announced in mid-April to resolve a humming sound from the data center.” Even so, the lawsuit was filed weeks after that statement, suggesting the plaintiffs’ concerns weren’t resolved by the mitigation work Microsoft touted publicly.
Wisconsin Case Echoes Wider Backlash Against AI Data Centers
The Fairwater dispute isn’t isolated. Futurism notes a similar complaint has emerged in Michigan, where a resident measured noise from a nearby data center at “a very irritating 60 decibels” from his own porch, while Newser reports the Wisconsin suit resembles a complaint from a Mississippi community alleging an xAI data center sounds like an always-on jet engine.
For gamers and tech-watchers, the Fairwater buildout matters because it’s part of the same wave of hyperscale AI infrastructure investment underpinning Microsoft’s Azure cloud, Copilot rollout and long-term compute ambitions across its software and gaming businesses. As Microsoft, Google, Amazon and xAI race to build ever-larger AI superclusters, the Wisconsin case is an early test of how much friction that expansion will generate in the communities forced to live next door to it — and how courts will weigh property rights against the industrial noise of the AI boom.
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