HAZELWOOD, Mo. – Tens of thousands of people in north St. Louis County remain under a boil order following a water main break late Monday evening.

A spokesperson for Missouri American Water said about 23,000 residents in parts of Berkeley, Ferguson, Hazelwood, and Florissant are affected. Meanwhile, St. Louis Lambert Airport officials said they’ve blocked off water fountains and its restaurants are handing out bottled water. In addition, hundreds of students in the Ferguson-Florissant School District had a virtual learning day due to flooding in the area.

The advisory was triggered by a 30-inch main break around 10:30 p.m. Monday on Dunn Road just off Interstate 270, which caused a temporary drop in water system pressure.

Missouri American Water crews have been on the scene for hours making repairs. The break is under control and repairs are expected to be completed around 8 p.m. The precautionary boil water advisory will remain in effect until further notice.

Multiple units at Hazelcrest Condominiums, located near the water main break, sustained heavy flood damage.

Ronnie Woods, one of the tenants forced from his unit by the flooding, shot cell phone footage of the massive water main break.

“So, when I get up and go look out the window, we see the heavens open. It strikes me—let me go check my downstairs,” Woods said. “We have a sliding door in the back. And I come downstairs to find out we are flooded.”

Christie Barnhart, spokeswoman for Missouri American Water, said crews have made significant progress with repairs.

“We’re anticipating early this evening when they are complete. At that point, we will take samples, and there is a mandatory waiting period before the advisory can be lifted,” she said. “We’re thinking approximately 48 hours after the samples are taken.”

Woods said his family just moved in a week ago. He’s sad to think they’ll have to move again.

“It’s actually disheartening. We just moved in here and it took a lot to get in here, a whole lot. Over a year. And now we might have to move,” he said.

Barnhart said there’s been no evidence of contamination thus far but said people should still bring their drinking water to a rolling boil for three minutes and let it cool before consuming it. The water is safe for laundry use, showering, and washing dishes.