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Microsoft Data Center Lawsuits: The Fairwater Noise Class Action and the Wisconsin Build-Out

Microsoft faces the first noise class action ever filed against a hyperscale AI data center: three Sturtevant, Wisconsin residents sued in July 2026 over the 1.2 million square foot Fairwater campus in Mount Pleasant, seeking to represent more than 1,000 households within 1.5 miles. Microsoft has acknowledged a tonal humming sound from the cooling fans. The case, the company's wider footprint, and what it means.

By the SueDataCenters.org editorial teamUpdated 6 min read Sourced to court records and primary reporting
Overhead view of flat open farm fields divided by section roads and a rail line, with a single large industrial building at the western edge and scattered farmhouses.

land now occupied by the Fairwater data center in Mount Pleasant, Wisconsin, photographed 2022-06-23. This is the ground in 2022, graded years earlier for the Foxconn project and still farmland. By 2026 a 1.2 million square foot campus stood on it and more than 1,000 households were suing over the sound.

USDA Farm Service Agency / USGS National Map, National Agriculture Imagery Program. Cropped from NAIP 0.6 m aerial imagery, scene m_4208717_se_16_060_20220623. (original)

Microsoft on the tracker

Tracker entries
One: the Fairwater noise class action, U.S. District Court for the Eastern District of Wisconsin, filed July 2026, pending
Proposed class
Everyone within 1.5 miles of the Fairwater campus, more than 1,000 households; named plaintiffs Garret Ostergaard, David Wade, and Joy Wade
Microsoft's response
Acknowledged that residents north of the facility have noticed a tonal humming sound, attributed to cooling fans
Footprint in contested markets
Mount Pleasant, Wisconsin; Cheyenne, Wyoming; Arizona; Iowa; Virginia; Washington; and campuses across the Midwest

Key Takeaways

  • Microsoft is the defendant in the first noise class action against a hyperscale AI data center: Ostergaard v. Microsoft, filed in July 2026 in the Eastern District of Wisconsin over the 1.2 million square foot Fairwater campus in Mount Pleasant.
  • The proposed class covers more than 1,000 households within 1.5 miles, the widest radius among the 2026 AI campus noise cases, and the complaint targets diesel generators and HVAC equipment running around the clock.
  • Microsoft has publicly acknowledged a tonal humming sound noticed by residents north of the site and attributed it to cooling fans, an admission of the noise if not of liability.
  • The case borrows its playbook from the Granbury, Texas crypto mining suits and is the one every AI campus neighbor and operator is watching for the first class certification ruling.
  • Wisconsin has become a data center battleground beyond Fairwater: the Port Washington lawsuits over the Vantage project and 16 local moratoriums, including Madison's, are on the tracker.
In this article

Has Microsoft been sued over a data center? Yes, and the case is a first. In July 2026, three residents of Sturtevant, Wisconsin, Garret Ostergaard, David Wade, and Joy Wade, filed a proposed class action in the U.S. District Court for the Eastern District of Wisconsin over noise from Microsoft's Fairwater campus in neighboring Mount Pleasant, a 1.2 million square foot AI facility on the site originally graded for Foxconn. They seek to represent everyone within 1.5 miles, more than 1,000 households, over noise from diesel generators and HVAC systems, and they ask for damages and an order stopping it. It is the first noise class action against a hyperscale AI data center anywhere in the country, and Microsoft's acknowledgment that neighbors have noticed a tonal humming sound from the cooling fans is the rare operator statement that concedes the noise while contesting the claim.

Every case on the tracker

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

    Pending, U.S. District Court, E.D. Wisconsin (filed July 2026)

    Three Sturtevant, Wisconsin residents filed a 2026 class action over noise from Microsoft's 1.2 million square foot Fairwater data center in Mount Pleasant, seeking to represent everyone within 1.5 miles, more than 1,000 households. Per reporting, it is the first noise class action against a hyperscale AI data center. What the case claims, why it matters, and what class membership means for residents.

Every Microsoft site in the registry

45 sites on the public record in 16 states: 12 operating, 15 under construction, 6 permitted, 12 proposed. 9 carry documented opposition or litigation. 6.1 GW planned. Most contested first.

30 more in the full registry, or download the data and filter by company.

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Living near a Microsoft data center? See if you have a case.

Why Fairwater is the case the industry is watching

Every AI campus has the same acoustic signature: dense racks of hot computers and the cooling systems that keep them alive, running every hour of the year. Until Fairwater, the assumption was that noise complaints against a hyperscaler ended in mitigation talks, as they did for Amazon's Great Oak neighbors in Virginia, or in nothing. A certified class of a thousand households changes the economics: one homeowner cannot fund the acoustic experts a case like this needs, but a class can, and the operator's exposure is on the table all at once.

The doctrinal groundwork came from the Granbury, Texas crypto mining cases, which have been testing what continuous industrial fan noise is worth since 2024. Fairwater applies it to a company with a market value in the trillions. Our full report on the Fairwater class action covers the complaint, the class definition, and what class membership would mean for residents inside the radius.

What Microsoft's neighbors can do

If you live near a Microsoft campus, the Fairwater plaintiffs' record is the model: a dated log of the sound and its effect on sleep, readings at the property line, the local ordinance's decibel limit, and a count of neighbors with the same experience. Microsoft's own statement about the humming is the kind of admission that makes a nuisance case easier, and it is worth saving.

Our noise lawsuit guide explains how these claims are built and our class action guide explains what joining one involves. Our free case review connects you with an independent attorney in our network who handles data center cases in your state, at no cost and with no obligation.

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Living near a Microsoft data center?

Frequently asked questions

Has Microsoft been sued over data center noise?

Yes. In July 2026, three Sturtevant, Wisconsin residents filed a proposed class action in the U.S. District Court for the Eastern District of Wisconsin over noise from Microsoft's Fairwater data center in Mount Pleasant, seeking to represent more than 1,000 households within 1.5 miles. They ask for compensatory damages, attorney's fees, and an order stopping the noise. The case is pending.

What has Microsoft said about the Fairwater noise complaints?

Microsoft acknowledged that people living north of the facility have noticed a tonal humming sound and said the noise was coming from cooling fans operating at the facility.

Is the Microsoft Fairwater lawsuit a class action?

It is a proposed class action. If the court certifies the class as defined, everyone living within a 1.5 mile radius of the Fairwater campus would generally be included automatically and receive notice of their rights, including the right to opt out.

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