A main rupture in March left thousands of San Franciscans without water service, moving utility leaders to apologize for the fluke.

A contractor working on a road construction project accidentally ruptured a large water main. At the same time, seismic work on the University Mound Reservoir, which serves much of the eastern part of the city, significantly reduced water transmission.

“In the future, we will do this work at night when demand is lower, and unplanned events like a major main break won't have any impact on our customers,” says Susan Leal, head of the San Francisco Public Utilities Commission.

While the loss of service was widespread, the interruption only lasted approximately 90 minutes before service was restored to all of those affected by the break.