The 48-inch main ruptured just before 8:00 a.m. at the intersection of Front and Tioga streets.
The water department isn't reporting any flooded basements, but they are still checking homes and businesses.
There are no water pressure problems, the department said, and everyone should have water.
The North Philadelphia incident is the second water main break of the morning in Philadelphia. The first happened a little after 7:00 a.m. on the 6400 block of Crittenden Street in the city's East Mount Airy section.
Crews arrived on the scene to find water coming from the street and crews were able to quickly shut off water to the 24-inch main.
There have been a number of major water main breaks in the past two weeks in Philadelphia.
On Sunday, July 22nd, a four foot water main broke a 21st and Bainbridge, opening a massive sinkhole. Then, one week later, an 8-inch main broke around at the intersection of Willits and Ashton roads in Northeast Philadelphia.