In evaluating the impacts of legacy road deicing activities on municipal wells in urban environments, estimates of salt mass loadings to the water table are critical. The diverse nature of the road networks, salt application practices and subsurface geology lead to the highly variable nature of this form of non-point source contaminant loading. In this work, detailed monitoring of the vadose zone along typical road type settings within an urban centre is used to track applied surface tracers to estimate recharge rates and to estimate the stored salt mass in the near-curb areas in order to estimate annual salt mass loadings to the water table. These data are than used to define the surface source term for a 3-D regional flow and transport model that was developed to predict future impacts to a municipal well field and to evaluate the utility of alternative management practices.