Columbus officials are seriously exploring whether highly cleaned wastewater, instead of treated drinking water, can be used to run and cool the region’s booming data centers. City staff say the move could help protect tap-water supplies and ease strain on utility infrastructure as hyperscale server farms and population growth both push demand higher. The proposal is still in an early study phase, but it would mark a major shift for a Midwestern city that has quickly become a national data-center hub.
Central Ohio already hosts scores of server farms, and large facilities can consume millions of gallons of water a day for cooling. That has raised alarms about both long-term supply and how used water is discharged, according to Spectrum News 1. The city has already started moving to expand capacity: Columbus' 2026 utilities rate materials list a fourth water-plant project among investments topping more than $2 billion, per the City of Columbus.
How the reuse plan would work
Under the concept on the table, treated effluent from the city's reclamation plants would get an extra round of treatment and then be routed back to data-center campuses for nonpotable cooling, instead of being sent downriver, Division of Water administrator John Newsome told Axios. "We'd have to have partners willing to financially contribute to the project," Newsome said, emphasizing that private financing and company buy-in would be required to make it work.
Columbus would not be the first city to try this kind of arrangement. An EPA case study describes a Microsoft-funded reuse utility in Quincy, Washington, built specifically to serve data-center cooling and reduce withdrawals of freshwater.
Regulatory and technical hurdles
Reusing water at this scale would require adjusted permits, new monitoring and treatment lines for problematic "blowdown" streams, and close coordination with state regulators. Those issues have already prompted Ohio EPA scrutiny of data-center discharges, according to Wastewater Digest.
Engineers also warn that without on-site or dedicated treatment, high mineral content and residual chemicals can chew up heat-exchange equipment, which means the utility buildout is not the only big-ticket item that operators and the city have to plan for.
Local politics and what comes next
City leaders have framed reuse as a way to protect tap water while still accommodating a lucrative industry. Some community members and several council members, however, say they want clearer disclosure about exactly what data centers would discharge and who would pick up the tab, attendees told Spectrum News 1.
Columbus water officials have started pitching the idea on national stages, including a WateReuse Association symposium that listed the city’s Division of Water administrator among the speakers. That is a sign local leaders want Columbus to serve as a regional test case, according to the WateReuse Association.
Officials stress that the reuse concept is still firmly in the study phase. Engineering work, funding negotiations and potential permit changes all have to come before any construction. At the same time, the Home Road water-plant project timeline shows the city is also building out traditional potable capacity for the decade ahead, according to Cbuswater.
If Columbus can crack the regulatory and cost puzzles, advocates say a municipal reclaimed-water system for data centers could become a model for the Midwest, a development that Axios reports other states are already watching closely.
