Why It Matters
Illinois legislators are weighing new state regulations that would mandate public reporting and planning requirements for data center water consumption. The proposed POWER Act would require facilities to disclose water usage quarterly and submit sustainability plans, as the state confronts rising demand for cooling resources from artificial intelligence infrastructure. Illinois already hosts multiple hyperscale data centers, and water use by these facilities has become a point of public concern.
What Happened
The House Executive Committee held its final hearing on data center regulation Wednesday, focusing on water resource management. State Representative Ann Williams, a Chicago Democrat, chaired the session and said Illinois needs a comprehensive water plan comparable to its energy planning process. The committee heard testimony from environmental groups supporting mandatory disclosure rules and from industry representatives who oppose the current bill.
One large data center can consume as much water as a small city in a single day, with usage varying based on facility size, ambient temperature, and cooling technology. The amount consumed depends heavily on whether a facility uses closed-loop systems or other methods.
By the Numbers
Supporters of the POWER Act say Illinois currently lacks statewide water use reporting standards or pre-approval evaluations for major withdrawals. The legislation would require quarterly public disclosure of water consumption and mandate closed-loop cooling or equivalent efficiency as a baseline standard. Data centers would also submit plans to the Illinois Water Survey, a non-governmental monitoring organization, and to the Illinois Power Agency.
Zoom Out
States across the country are grappling with data center water consumption as AI-driven facilities proliferate. Climate patterns are shifting toward hotter summers and more frequent droughts in the Midwest, according to environmental advocates, creating competing demands from agriculture, industry, residential users, and technology infrastructure. Illinois Senate committees have already conducted separate hearings on groundwater supply and resource management.
What’s Next
Lawmakers indicated that discussions on water policy will continue. The Data Center Coalition argues that the POWER Act unfairly targets one industry and that other high-volume water users such as agriculture, manufacturing, and golf courses should face similar transparency requirements. Environmental groups counter that public disclosure will ease community concerns if actual water usage proves lower than feared. The bill remains under consideration in the General Assembly.