The United States public water supply system is one of the safest in the world. The general public should continue to drink and use water just as they would under normal conditions. Your local water treatment supplier and local governments are on the alert for any unusual activity and will notify you immediately in the event of any public health threat. At this point, we have no reason to believe that additional measures need to be taken.
The U.S. Environmental Protection Agency (EPA) is the lead federal agency that makes recommendations about water utility issues. The EPA is working closely with the CDC and the U.S. Departments of Defense and Energy to help water agencies assess their systems, determine actions that need to be taken to guard against possible attack and develop emergency response plans. For more information, visit the EPA Safe Water website.