Only a fraction of precipitation enters lotic systems during a storm event. In order to understand the watershed controls on source water and first flush (FF) in catchments of varying land use, we used specific electrical conductance to trace storm response during the Post-Tropical Cyclone Sandy event in October 2012. These data came from a citizen science network called the Lotic Volunteer for Temperature, Electrical Conductance and Stage (LoVoTECS) which provided a unique opportunity to investigate the spatial variation at a broad spatial scale. Forty New Hampshire watersheds were analyzed during this event. The storm metrics analyzed in this study were: percent new water, presence of FF and magnitude and duration of FF. This research showed that new water was negatively correlated with the presence of lentic systems and was not significantly correlated with development. Results also suggest that soil organic matter, not development was the variable that was most closely related to the presence of FF.