The Municipal Authority of Westmoreland County told residents in McKeesport, Port Vue, Versailles and White Oak to boil their water after a pump failed on Saturday.
The agency says the loss of water pressure could allow disease-causing organisms to enter the water distribution system.
The agency says the McKeesport Water Treatment Plant is operating and purging air from its system. Two successful tests are needed before the boil water advisory will be lifted.
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