"EPA has estimated that if spending for capital investment and operations and maintenance remain at current levels, the potential gap in funding for 2000–2019 would be approximately $263 billion for our drinking water infrastructure." (http://www.epa.gov/awi/distributionsys.html) -Link
PDM/ WatrWise™ invites you to search the Web to find your own information about water supply challenges relating to technology and aging water infrastructure. You can do a general search using your favorite search engine. Suggested search terms include: aging water infrastructure, water infrastructure, water supply technology and so on.