Number of outbreaks associated with drinking water by water system type and year (n = 780), 1971 to 2006. “Other” includes outbreaks associated with bottled water (n = 11), mixed water system types (n = 3), unknown systems (n = 3), and bulk water purchase (n = 1). Number of outbreaks associated with drinking water by water system type and year (n = 780), 1971 to 2006. “Other” includes outbreaks associated with bottled water (n = 11), mixed water system types (n = 3), unknown systems (n = 3), and bulk water purchase (n = 1). Gunther F. Craun et al. Clin. Microbiol. Rev. 2010; doi:10.1128/CMR.00077-09