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.

READ MORE: 5 Year-Old Injured In Eastpointe Accidental Shooting; Gun Safety Instructor Says Lock Up Your Guns

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.”

READ MORE: Ballot Initiative To Strike Detroit's Adult-Use Ordinance Rejected, Opponents Continue To Fight

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.”

MORE NEWS: 5-Year-Old Accidentally Shoots Self In Foot At Eastpointe Home

No illnesses or injuries were reported.