Microsoft's AI Datacenter is So Noisy it Ends Up in Court

The large Fairwater datacenter of Microsoft, located in Mount Pleasant in the state of Wisconsin, is at the center of a legal action initiated by several residents who complain about a noise level considered excessive and persistent. The lawsuit, filed on July 1, 2026, seeks compensation for damages suffered without specifying the economic entity.

The facility, inaugurated in September 2025, represents one of the most advanced AI datacenters built by Microsoft. The site was launched using NVIDIA GB200 accelerators, with racks capable of processing up to 865,000 tokens per second, a configuration that requires a substantial cooling system.

According to the documentation filed in court, Microsoft allegedly did not adopt adequate industry practices to prevent the noise produced by the infrastructure from propagating beyond the datacenter's perimeter. The plaintiffs argue that the sound invades homes and private properties, describing the phenomenon as a constant, widespread hum, attributed also to very low-frequency components akin to infrasound, difficult to quantify through traditional decibel measurements. Reported consequences also include sleep disturbances.

The matter had already emerged in previous months during the commissioning phase of the facility. On April 10, Microsoft confirmed awareness of reports from the local community, announcing the start of a technical investigation to identify the cause of the problem and stating its intention to cooperate with residents.

Five days later, the company provided further details, explaining that the noise was traced back to the cooling system fans, temporarily forced to operate at high speeds during the startup operations. Microsoft clarified that the sound levels were in compliance with local regulatory limits but acknowledged that it had not anticipated that the particular tone of the noise could propagate to such high distances.

To limit the phenomenon, the company announced manual adjustment of the fans during the completion of startup activities, the introduction of permanent operational limits for fan speeds, and the installation, in the following months, of additional components aimed at noise reduction.

The most recent update, published on June 18, reports that the team of engineers and consultants appointed have identified the acoustic source, conducted tests, and implemented mitigation measures. According to Microsoft, independent monitoring conducted onsite would have shown that the interventions have completely resolved the issue, an assessment that has also been confirmed by several local residents. The company has nevertheless stated that it will continue to install additional soundproofing systems in the coming months and to continuously monitor the site.

Despite these reassurances, the lawsuit was still filed a few weeks later. It will now be the judicial process to determine whether the measures adopted by Microsoft are sufficient or whether the claims made have a legal basis.