A water main break in Mission Hills erupted early Wednesday morning leaving some without water service for part of the day. A break on an 8-inch diameter water main was reported at 3:45 a.m. Wednesday near the intersection of Fort Stockton Drive and Ibis Street in Mission Hills. It was shut down at about 5 a.m. City of San Diego Public Utilities Department crews quickly capped the line but repairs had to continue into the afternoon.