Witnesses told the Los Angeles Times that the workers used two home-sized wet-vacuums and a large machine - size of a lawn mower to tackle the mini-flood.
The flooding blocked access to the second-floor bar, forcing thirsty Oscar attendees to quench their thirst at the lobby's refreshment counter.
Entertainment Weekly TV writer Lynette Rice posted an image on Twitter and captioned, "Flood at the Oscars! Great day to be a star."
LA City Fire department was unable to confirm the cause of the leak.