Editing Philadelphia Water Supply (section)

== Distribution System ==

Over 3,000 miles of water mains distribute treated water throughout Philadelphia, ranging from large transmission mains to smaller distribution pipes serving individual streets and buildings. The system includes pumping stations, storage tanks, and pressure regulation facilities that maintain adequate pressure throughout the varied topography of the city.<ref name="pwd"/>

Infrastructure age presents ongoing challenges, with portions of the system dating to the nineteenth century. Pipe materials, joint types, and other characteristics reflect construction practices of different eras. Lead service lines, connecting mains to buildings, remain a concern in older areas despite treatment that minimizes lead leaching from pipes.<ref name="pwd"/>