Abstract This field trip consists of stops in four locations that provide insight into the San Andreas fault along the San Francisco peninsula. The first two stops provide an overview and close-up look at the fault where no urbanization has occurred. The last two stops are examples of areas where urbanization occurred directly over the fault prior to current regulations. The field trip also addresses the history of, and seismic hazard issues related to, an important part of the San Francisco Public Utilities Commission's (SFPUC) water-supply system, which is located along the San Andreas fault.