Philadelphia officials have confirmed that the city's drinking water has not been affected by a chemical spill into the Delaware River. A pipe burst at a chemical plant in Bristol Township, located near the city, on Friday evening last week, spilling between 8,100 and 12,000 gallons of water-based latex finishing solution into the river. Although the substance is non-toxic to humans, concerns about contamination quickly emerged, prompting warnings from officials to residents to switch to bottled water. However, no traces of contamination have been found in the city's water supply, and authorities are now "confident that the threat has passed," Mayor Jim Kenney said last night. "We can all confidently say the threat has passed — I repeat: All the city's drinking water is safe to drink and will not be impacted by the spill." Sampling has failed to uncover any substance from the spill, and "models tracking the flow and tide of the Delaware River show the potential threat is passing us," Kenney added.