The Pittsburgh Water and Sewer Authority has lifted its flush-and-boil-water advisory for about 900 households in the Lawrenceville area.
The PWSA made the announcement around 3 p.m. Sunday.
On Friday, it issued an advisory that said a series of blocks had been affected.
The area was bordered roughly by Woolslayer Way to the south, 44th and 46th streets to the east, Davison Street to the northwest and 40th and 39th streets to the southwest.
The alert stemmed from a burst in a six-inch water main on Penn Avenue between 39th and 45th streets, PWSA said.
The break led the authority to drain a 20-inch water main, causing low water pressure on that stretch of Penn and some adjacent streets, according to PWSA.
Although workers repaired the break and restored water pressure, the authority said, a decrease in pressure can allow contaminants to enter the water.
Workers tested to confirm disinfectant levels and to make sure the water is safe to consume without boiling.