Joliet Plans Massive Data Center on Dwindling Aquifer

Proposed facility would be Illinois' largest, but concerns linger over water supply and environmental impact.

Published on Mar. 4, 2026

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The city of Joliet is moving forward with plans to build the largest data center in Illinois, which would be located directly on top of an underground aquifer that has been steadily depleting over the past 150 years due to heavy pumping. While the project's proponents argue that advances in data center technology and access to water from Lake Michigan could make the facility viable, many Joliet residents have expressed alarm over the potential environmental impact.

Why it matters

Data centers are increasingly seen as essential infrastructure for the modern digital economy, but their water and energy demands can put a significant strain on local resources. Joliet's plan to build its facility atop a dwindling aquifer has raised concerns about the long-term sustainability of the project and its effects on the surrounding community.

The details

Joliet's proposed data center would be the largest in Illinois, occupying a significant footprint directly on top of the region's underground aquifer. This aquifer has been steadily depleted over the past 150 years due to heavy pumping, raising concerns about the availability of water to support the data center's operations. Proponents of the project argue that advances in data center technology and access to water from nearby Lake Michigan could help mitigate these concerns, but many Joliet residents remain skeptical about the environmental impact.

  • Joliet has been planning the data center project for several years.
  • The city is now nearing final approval for the facility.

The players

Joliet

The city of Joliet, Illinois, which is proposing to build the largest data center in the state.

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What’s next

The Joliet City Council is expected to make a final decision on the data center project in the coming weeks.

The takeaway

Joliet's plan to build a massive data center on top of a dwindling aquifer highlights the growing tension between the tech industry's need for reliable infrastructure and the environmental concerns of local communities. As data centers become increasingly essential, finding sustainable solutions that balance economic and ecological priorities will be a key challenge for policymakers and industry leaders.