This assessment, which is done every four years, reflects data collected in 2007 from states. According to the survey results, the nation's water utilities will need to invest an estimated $334.8 billion over the next 20 years to deal with aging infrastructure. This drinking water needs survey will help EPA determine the distribution formula for Drinking Water State Revolving Fund (DWSRF) grants for the fiscal years 2010 through 2013 budgets.