CHICAGO, Illinois, August 18, 2026 — On Tuesday Mayor Brandon Johnson signed an executive order to increase regulation of the data center industry in Chicago. The measure also instructs that City Council pass a moratorium on new sites. About 39 data centers currently operate in the city.
New Reviews for Air and Noise
The order directs city departments to seek stricter review of air permits for diesel backup generators” or whatever the order specifically does.The order also imposes new restrictions on noise emitted by devices such as air conditioning units and machinery powered by mechanical systems close to residential blocks. Projects will now undergo interdisciplinary review to assess power needs, water use and cumulative local impacts.
“Chicago will not allow unchecked development to strain our water supply, drive up energy costs, or compromise the health of our communities,” Mayor Brandon Johnson said during Tuesday’s announcement. City officials call the order the most stringent regulatory framework around data centers in any large American city. A new task force will draft permanent zoning and code changes over the next few months.
Why Now
Chicago’s current rules were built around facilities that draw far less power and water than modern data centers. Residents living near active sites have complained about incessant machinery noise and higher local utility bills. Those complaints were cited in a citywide panel recommendation for the overhaul just one month before Johnson’s order.
In the spring, a burgeoning movement to restrict noise from industrial facilities spread to nearby municipalities, including Aurora, where the City Council approved comparable limits in March after residents raised similar concerns. This year, both Denver and New York state passed their own data center policies. The order in Chicago is an extension of that regional trend.
Springfield Under Pressure
Johnson leveraged the announcement to encourage state lawmakers to impose more robust statewide protections. Speaking on broader legislative goals, Johnson emphasized: “The state has to step up and guarantee adequate water protection when it comes to data centers and pay attention to our energy affordability issue.” At the legislative level, Illinois’ POWER Act—introduced last session but stalled in the legislature—would impose environmental reviews and community benefit agreements.
Sixty-eight percent of likely Illinois voters back tougher regulation of data centers, a statewide poll has found. Environmental groups say that Illinois stands now behind Texas and Florida on local control over the industry. The endorsement was welcomed by Illinois Environmental Council City Government Affairs Director Iyana Simba, who said, “Chicagoans have voiced concerns around data center impacts—from energy affordability and grid reliability to pollution and water consumption—that should be urgently addressed.”
Federal and state lawmakers have monitored Chicago’s charge as other suburbs debate similar moves. The municipal framework passed in the region serves as a model that other local governments are now looking at for their own data-center regulations. Unlike other cities, though, Chicago’s order explicitly requests a moratorium alongside new departmental review requirements.
Flashpoint on the Southeast Side
The opposition revolves around a proposed quantum computing facility that is an aspect of the plans for redevelopment of the former U.S. Steel South Works property. The development’s projected environmental footprint and its suitability for the area had residents rallying against it during a May City Council meeting. The recommendations of the task force, expected by March 15, will dictate how similar projects are reviewed in the future.
Most current data centers also use municipal drinking water for cooling, putting further stress on an infrastructure already under strain. Full details of the mayor’s order and task force are available on the City of Chicago Official Website. Approval of the moratorium still needs to come from City Council before any legally-binding pause on new construction can go into effect.
Even though industry representatives have not publicly opposed the order, they insist on a seat at the table of the new task force. They contend the jobs and tax revenue brought by data centers offset their environmental costs. Balancing that argument during negotiations will guide the efforts of the task force as it writes permanent rules before a March deadline.
