This helps remove stagnant water from plumbing and brings in fresh water from water mains.
Mr. Pickering said the first round of sampling was done Sunday, and test results reported Monday afternoon showed no contamination of the water supply.
The rupture of the 20-inch water main at Centre and South Negley avenues, early Sunday, caused street flooding in the area and low water pressure.
Repairs to the water main were completed Tuesday morning, and PWSA customers along Centre, roughly between South Negley and South Euclid avenues, had their water restored late Tuesday morning, Mr. Pickering said.
The boil water advisory is the third such advisory issued by the PWSA this year.
The first, in late January, was issued after the DEP raised concerns about water treatment at the Highland Park Reservoir and impacted about 100,000 city residents.
Robert Weimar, PWSA’s interim executive director, said no water supply contamination was detected in either situation.
After decades of neglect, we’re beginning to put in place the financial and human resources to renew our systems as efficiently and as effectively as possible.” City Councilman Dan Gilman, whose district includes the water main break and also many residents who went through the January advisory, said similar system problems in past years had not led to boil warnings.
But he hopes “they recognize [the advisory] is being done out of an overabundance of caution for their health.” "Thankfully, we avoided any issues," Mr. Gilman said.
Mayor Bill Peduto said he expects a panel’s recommendations by Dec. 31 for strengthening the water system.