Philly residents now advised tap water is safe through Monday night following chemical spill, officials say

After advising residents that they may want to switch to bottled water Sunday afternoon following a chemical spill into a Delaware River tributary — setting off a buying spree that emptied store shelves across the city — Philadelphia officials said the city’s tap water would be safe to drink at least through Monday night.

The advisory, which officials issued Sunday morning “out of an abundance of caution” in response to the release of chemicals from a processing plant in Bucks County, was updated later Sunday after officials said they found...