Published
July 9, 2026
If you live near a giant new AI data center, this suit is the one to watch: neighbors of Microsoft's Wisconsin campus say the noise has taken over their homes — but at this stage there is nothing to file.
Allegations Only · No Settlement Yet
This article describes a class action complaint. The statements below are unproven allegations. Microsoft has not been found liable, there is no certified class, and nothing to claim at this time. This page is informational and is not legal advice.
What Is This About?
The boom in artificial-intelligence infrastructure has a new legal flashpoint: the noise it makes. A group of Wisconsin residents has filed a proposed class action against Microsoft over the constant sound coming from its Fairwater data center, a roughly $7.3 billion AI campus in Mount Pleasant, in Racine County. The case, Ostergaard v. Microsoft Corporation, No. 2:26-cv-01169, was filed in the U.S. District Court for the Eastern District of Wisconsin on July 1, 2026, and is brought as a private-nuisance claim on behalf of the surrounding neighborhood.The named plaintiffs are residents who live within about a mile and a half of the facility. They say the campus runs around the clock and that the noise — which the complaint likens to a parked freight train that never leaves — has made it hard to sleep, sit outside, or enjoy their own homes. Microsoft has said publicly that it is committed to being a good neighbor and had previously indicated it was addressing noise concerns. None of the allegations has been tested in court.
Status
Complaint Filed
Ostergaard v. Microsoft Corporation · E.D. Wis. · filed July 1, 2026
Who's Affected
Residents within ~1.5 miles of the Fairwater data center
Reportedly more than 1,000 households · class certification requested, not granted
Alleged Harms
24/7 noise, light pollution, dust & truck traffic
Loss of use and enjoyment of homes · alleged reduced property values
Can I Claim?
No — nothing to claim yet
No settlement, no fund, no claim form
What the Lawsuit Alleges
The complaint frames the data center as an around-the-clock industrial neighbor dropped into a residential area. According to the plaintiffs, the noise comes from equipment such as diesel generators and the facility's large cooling systems — chillers, cooling towers, and banks of fans that run continuously to keep thousands of AI servers from overheating. The suit alleges the sound is unreasonable and invasive, and that Microsoft failed to install adequate acoustic barriers or walls to contain it.Beyond noise, the complaint describes light pollution that has dimmed the night sky, dust, and heavy truck traffic tied to the still-expanding campus. The alleged result is a loss of the use and enjoyment of nearby homes — one plaintiff reportedly changed work shifts because of disrupted sleep — and a hit to property values. The plaintiffs are asking the court to certify a class, award compensatory damages for lost enjoyment and diminished property value, and issue an injunction ordering Microsoft to abate the noise. All of this is what the plaintiffs allege; Microsoft has not yet responded to the complaint on the merits.
Who Would Be in the Class
The proposed class covers property owners and residents within roughly a 1.5-mile radius of the Fairwater facility — reportedly more than 1,000 households. Importantly, "proposed" is the operative word: no class has been certified. A judge still has to decide whether the case can proceed on behalf of the whole neighborhood or only the named plaintiffs, and Microsoft will have the chance to contest both certification and the underlying claims.The Bigger Picture: AI Data Centers vs. Their Neighbors
The Microsoft suit is part of a fast-emerging pattern. The infrastructure powering the AI boom — enormous, power-hungry data centers that need constant cooling — is being built at a pace and scale that is bringing heavy industrial operations right up against residential neighborhoods. Noise, in particular, has become the flashpoint, because cooling equipment and backup generators run continuously and are audible far beyond the property line.This is not the first such case. A separate proposed class action targets xAI over turbine noise at its facility near Memphis — see our coverage of the xAI Southaven turbine noise class action. The two suits share a theory — that a data center is running as an industrial nuisance in a residential area — but they involve different companies, different sites, and different equipment, and each will rise or fall on its own facts.
Is There Anything to Claim?
No. A filed complaint is the start of a case, not a settlement. There is no fund, no claim form, and no deadline, and no class has been certified. If the case were later to settle or produce a judgment, any relief would be worked out through the court and a notice process. For now, the case is worth watching — especially for anyone living near a large data center — but there is nothing to file.This page is informational and is not legal advice.
Frequently Asked Questions
Has a class action been filed over the Microsoft Fairwater data center noise?
Yes — Ostergaard v. Microsoft Corporation, No. 2:26-cv-01169 (E.D. Wis.), filed July 1, 2026, as a private-nuisance suit. The allegations are unproven and no class is certified.Who would be part of the proposed class?
Property owners and residents within about a 1.5-mile radius of the Fairwater data center in Mount Pleasant, Wisconsin — reportedly more than 1,000 households. Certification has been requested, not granted.What does the lawsuit allege?
Constant noise from generators and cooling systems, plus light pollution, dust, and truck traffic, causing loss of enjoyment of homes and reduced property values, with Microsoft alleged to have failed to install adequate noise barriers. These are unproven allegations.Is there money to claim right now?
No. There is no settlement, fund, or claim form. The plaintiffs seek damages and a court order to reduce the noise; nothing has been awarded.Is this the same as the xAI data center noise lawsuit?
No. This case is against Microsoft over its Wisconsin facility; the xAI case concerns turbine noise at its Memphis-area site in Southaven, Mississippi. Different defendants, sites, and cases.Sources
• Justia Dockets — Ostergaard v. Microsoft Corporation, 2:26-cv-01169 (E.D. Wis.)• Law360 — Microsoft Hit With Class Action Over AI Data Center Noise
• Wisconsin Public Radio — Neighbors Sue Over Microsoft Mount Pleasant Data Center Noise
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Status
Complaint filed — no class certified, no settlement
Case Title
Ostergaard v. Microsoft Corporation
Case Number
2:26-cv-01169
Court
U.S. District Court, Eastern District of Wisconsin
Date Filed
July 1, 2026
Claim Type
Private nuisance (environmental class action)
Official Website
Justia Docket — Ostergaard v. Microsoft
