From the Associated Press via The Washington Post:

“EPA found that the nation’s 53,000 community water systems and 21,400 not-for-profit, non-community water systems will need to invest an estimated $334.8 billion between 2007 and 2027,” stated the federal Drinking Water Infrastructure Needs Survey and Assessment, which is updated every four years…

“This is a very serious concern,” said Carolyn Berndt of the National League of Cities. “Many communities have a long-term plan to replace all their underground water infrastructure, but even if they do a couple percentages of pipes a year, it’s still going to take over 100 years for some of them to replace it all.”