The advisory is for customers in areas of North Wilmington, Chadds Ford, Bethel Township and Concord Township.
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Customers in the affected areas should boil their water until further notice.
Veolia says a contractor working at Naamans Creek Road and Route 202 damaged a water main resulting in the break.
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"Veolia water quality professionals have begun the process of collecting water quality samples, the testing process can take a minimum of 72 hours," the utility said.
The boil water advisory is in effect until further notice.