The Centers for Disease Control and Prevention (CDC) reported 33 waterborne disease outbreaks traceable to drinking water in the two-year period from 2009 through 2010. This figure is in line with previous biennial CDC reports, with the problems continuing to be focused on smaller and often non-regulated water systems. For example, Legionella, which develops predominantly in building plumbing outside water systems’ control, was responsible for 19 of the outbreaks (58%). Untreated (non-disinfected) ground water and lax distribution system maintenance at small water systems are also significant factors in outbreak occurrence. Though continued vigilance is necessary to prevent any outbreaks from occurring, the nature and relatively small number of incidents should instill further public confidence in the overall quality of drinking water supplied from large community water systems.