The break closed Marin Boulevard at 14th Street, where crews were digging up the street to fix the main.
Officials said they had just fixed a 6-inch water main Tuesday at the mouth of the Lincoln Tunnel in Weehawken.
Although they didn't have the cause of the breaks, United Water noted that "this winter has been challenging and the fluctuating temperatures cause these kinds of issues."
The Port Authority was also getting ready for the storm, moving a large amount of snow from the lanes leading to the inbound Holland Tunnel at 12th Street and Manila Avenue.
In Jersey City, officials will be spreading brine, a salt and water mixture, on all main streets, hills and secondary streets today. The city has 18,000 gallons of brine, an anti-icing agent.
The JCIA has 325 tons of salt available, which the city said will be used for hills and main thoroughfares.
"Normally for a storm as they are predicting for Thursday, the JCIA would use 1,000 to 1,500 tons," Jersey City spokesman Jennifer Morrill said.