It happened before 7:30 a.m. at the intersection of Butler Pike and Ridge Avenue in Whitemarsh Township.
Aqua America tells Action News the break in the 12-inch main interrupted service to a number of homes and businesses.
Crews were on the scene working to the repair the main.
As of 10:30 a.m. service had been restored to all but 10 homes and businesses along Butler Pike.
