The City of Philadelphia says it is now confident tap water from the Baxter Drinking Water Treatment Plant will remain safe to drink until at least 11:59 p. ”“This updated time is based on the time it will take river water that entered the Baxter intakes early Sunday morning to move through treatment and water mains before reaching customers,” the statement reads. ”On its website, the Philadelphia Water Department said it provides water to more than “2 million people in Philadelphia, Montgomery, Delaware, and Bucks counties