2007-2008, 36 outbreaks from drinking water led to 4,128 cases of illness

"Although we probably have one of the safest drinking-water systems in the world, every year there are some breaks in the system," says Linda Birnbaum, Ph.D., director of the National Institute of Environmental Health Sciences. In 2007-2008, 36 outbreaks from drinking water led to 4,128 cases of illness (including a salmonella outbreak in Colorado that sickened 1,300 people) and three deaths.
In 2009, 28% of all U.S. systems broke at least one significant EPA rule.
Source: Today