DETROIT (WWJ) – A Detroit wastewater treatment plant was evacuated for about an hour and-a-half, early Wednesday morning, after workers said a strong chlorine smell left their eyes burning.

Workers at Pump Station called 911, said Detroit Water and Sewerage Department spokesman Greg Eno, and HAZMAT crews discovered a white substance in a collection basin.

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They’ve taken a sample to determine what the substance is.

“There’s still an ongoing investigation about how this happened; and, of course, once we find out how it happened the next step, of course, would be to take steps to make sure it doesn’t happen again.”

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Eno said the water is safe to drink.

“It’s nothing pervasive and I don’t think it’s necessarily a symptom of something that’s seriously wrong,” Eno added. “This things happen, and accidents happen, and we’re just trying find out what happened.”

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No illnesses or injuries were reported.