Video posted by the Chicago Police Marine Unit shows rescue crews jump into the lake to help save the three people.
They were assisted by the Coast Guard and a Shoreline Sightseeing boat.
The victims were brought back to safety at 31st Street Beach, police said.
#ChicagoPolice @CPDMarineUnit M3 responded to 3 overturned #waverunners outside #MonroeHarbor w/ 3 victims in the water struggling. M3 rescued 2 victims & @ShorelineSights #BlueDog rescued the 3rd. @USCGGreatLakes on scene assisting as well... pic.twitter.com/rpEsbMy3Ri— Chicago Police Marine Unit (@CPDMarineUnit) August 13, 2021