A total of 5,700 gallons of nitric acid was spilled at a chemical company in Minneapolis on Friday.
The spill at Hawkins Chemical has been contained, but an estimated 600 to 700 gallons of nitric acid were poured into the storm drain, a report said, citing fire officials.
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At least 2,000 gallons of nitric acid were spilled when a valve was knocked from a tank, the Minneapolis Star Tribune reported.
The building was evacuated and no injuries have been reported, Minnesota's Fox 9 reported.
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Nitric acid is a highly corrosive chemical used in manufacturing and fertilizer, the station reported.
Although this incident was a hazardous chemical spill, nitric acid is one of the easier ones for fire crews to handle, a fire official told the Tribune.