The drinking water epidemiology program is the centerpiece of a unique collaboration between the San Francisco Department of Public Health and the Public Utilities Commission. Our aim is to ensure a safe drinking water supply by acting as a resource to the Public Utilities Commission with regard to health issues related to drinking water. We provide immediate support and response to events that raise health implications and concerns. This includes coordinating surveillance in the event of water quality problems, providing fact sheets or press releases in response to public concerns when water quality study results are reported in the media, responding to media and customer inquiries regarding water information related to San Francisco's Public Utilities Commission water quality and providing health perspective on legislative measures concerning the San Francisco's Public Utilities Commission Water Quality Division.