The Environmental Protection Agency says preliminary tests indicate iron-contaminated wastewater that leaked from the Portage U.S. Steel plant into a Lake Michigan tributary presents no risk to public health.
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The EPA said Wednesday that surface water samples were taken near the outfall at the U.S. Steel Midwest plant.
Federal and state agencies continue to investigate the cause of the discharge.
U.S. Steel idled the plant after it said a wastewater treatment facility experienced “an upset condition” on Sunday that sent a rusty colored plume containing elevated lead levels into the Burns Waterway.