Illinois' data centers drain millions of gallons—threatening water security

Illinois faces growing concerns over the massive water consumption of data centres across the state. These facilities now use millions of gallons daily, raising alarms about long-term water security. Experts warn that without action, drinking supplies and agriculture could be at risk. A single data centre can consume up to 5 million gallons of water in one day—enough to supply a medium-sized town. Most facilities in the Chicago area rely on municipal drinking water for cooling, but this water is lost after use. With Lake Michigan as the primary source, officials stress that even its vast supply is not unlimited.

Scientists and advocates are pushing Illinois to adopt stricter water management policies. They point to states like California, where similar measures have already been introduced. Nationwide, data centres used 17.4 billion gallons in 2023, with projections nearing 72.6 billion gallons by 2028. One proposed solution is using treated wastewater from treatment plants to cool data centres. This approach could ease pressure on freshwater reserves while maintaining critical operations.

The rising demand from data centres threatens Illinois’ water resources if left unchecked. State officials and experts agree that immediate steps, such as wastewater reuse, are needed to balance industrial needs with drinking water and farming requirements. Without intervention, the strain on Lake Michigan and local supplies will only intensify.